# battery Published articles for battery. This is one page of public article previews, not the complete archive. Follow Next page to continue. Summaries are not the original full articles. ## Power Banks Make You Pick a Size, Trozk T3 Lets You Build One DevFeed: [Power Banks Make You Pick a Size, Trozk T3 Lets You Build One]() Original publisher: [Read original article]() Author: JC Torres Published: 2026-09-17T13:20:55Z Content type: article Language: en Sources: [Yanko Design]() Topics: [Hardware]() Tags: [battery](), [capacity](), [fast](), [gadgets](), [gadgets-technology-modular-power-bank](), [hardware](), [modular](), [power](), [power-bank](), [technology]() ### AI overview The Trozk T3 Module Power Bank uses separate modules that can be combined or detached to provide 5,000mAh, 10,000mAh, or 15,000mAh of capacity. It supports charging up to 22.5W through PD and QC protocols and includes built-in safety protections, automotive-grade 21700 cells, and a color status display. ### Source excerpt Power Banks Make You Pick a Size, Trozk T3 Lets You Build One Most power banks force a single decision at checkout: buy the huge one for peace of mind, or the tiny one for your pocket, and... ## Libreboot 20140309 release DevFeed: [Libreboot 20140309 release]() Original publisher: [Read original article]() Author: Leah Rowe Published: 2026-09-17T04:32:50.666044Z Content type: release Language: en Sources: [News about Libreboot releases and development]() Topics: [libreboot](), [boot]() Tags: [article](), [battery](), [bios](), [boot](), [canoeboot](), [coreboot](), [crypto](), [debugging](), [free-software](), [libre](), [libreboot](), [opensource](), [processor](), [release](), [uefi]() ### AI overview The Libreboot 20140309 release reduces boot time, adds cryptographic and cryptodisk modules to GRUB, includes cbfstool in binary archives, and provides separate ROM images for faster booting or debugging. It also describes changes intended to reduce battery impact. ### Source excerpt Article: Libreboot 20140309 release Web link: https://libreboot.org/news/libreboot20140309.html ## The 5 Best Home Office Gadgets of September 2026 DevFeed: [The 5 Best Home Office Gadgets of September 2026]() Original publisher: [Read original article]() Author: Srishti Mitra Published: 2026-09-15T11:40:11Z Content type: comparison Language: en Sources: [Yanko Design]() Topics: [Bluetooth](), [e-ink](), [USB]() Tags: [2026](), [5-best-designs](), [battery](), [best](), [deals](), [deals-gadgets-office-product-design-shop-5-best-designs-home-office-yd-design-storm-yd-selec](), [dongle](), [e-ink](), [gadgets](), [home-office](), [office](), [portable](), [product-design](), [september-2026](), [shop](), [usb](), [wireless](), [yd-design-storm](), [yd-select]() ### AI overview A comparison of five home-office gadgets selected for their practical, space-saving designs. The supplied text highlights the OrigamiSwift Mouse, a foldable Bluetooth mouse with USB-C charging and up to three months of battery life, and introduces the Inkleaf Foldable Dual-Screen E-Ink Notebook. ### Source excerpt The 5 Best Home Office Gadgets of September 2026 The home office has been redesigned more times than anyone can count. Most of those attempts involve cable management trays and monitor arms that take... ## ESP32-C5 Pico board follows Raspberry Pi Pico form factor, ships with on-board or external antenna DevFeed: [ESP32-C5 Pico board follows Raspberry Pi Pico form factor, ships with on-board or external antenna]() Original publisher: [Read original article]() Author: Jean-Luc Aufranc (CNXSoft) Published: 2026-09-09T07:00:50Z Content type: news Language: en Sources: [CNX Software - Embedded Systems News]() Topics: [ESP32-C5](), [Raspberry Pi](), [Espressif](), [cpu](), [RISC-V](), [SOC](), [Bluetooth](), [wifi 6](), [zigbee](), [Matter](), [Embedded Systems](), [ESP-IDF]() Tags: [802-15-4](), [arduino](), [battery](), [ble](), [bluetooth](), [bluetooth-le](), [boot](), [c-c-plus-plus](), [development-board](), [embedded-systems](), [esp-idf](), [esp32](), [esp32-c5](), [espressif](), [gpio](), [hardware](), [iot](), [matter](), [news](), [port](), [raspberry-pi](), [risc-v](), [thread](), [usb](), [waveshare](), [wifi-6](), [zigbee]() ### AI overview The Waveshare ESP32-C5 Pico is a development board in the Raspberry Pi Pico form factor. It uses an ESP32-C5-MINI-1 series module with a RISC-V processor, dual-band WiFi 6, Bluetooth LE, and 802.15.4 support for Zigbee, Thread, and Matter. The board includes GPIO headers, USB-C, buttons, LEDs, and Li-Ion battery support, with variants offering PCB or external antennas. ### Source excerpt Waveshare ESP32-C5 Pico board brings the ESP32-C5 dual-band WiFi 6, Bluetooth LE, and 802.15.4 (Zigbee/Thread) SoC to the Raspberry Pi Pico form factor. The board features an ESP32-C5-MINI-1 Series module with PCB or external antenna, two 20-pin GPIO headers, a USB-C port for power and programming, Reset and Boot buttons, and a few LEDs. It also supports Li-Ion battery charging and discharging. Waveshare ESP32-C5 Pico specifications: Wireless module - ESP32-C5-MINI-1 or ESP32-C5-MINI-1U Wireless MCU - Espressif Systems ESP32-C5HF4 CPU Single-core 32-bit RISC-V processor @ up to 240 MHz Low-power RISC-V core @ 48 MHz acting as the main processor for power-sensitive applications Memory - 384 KB SRAM on-chip Storage - 320 KB ROM, 4MB SPI flash Wireless Dual-band (2.4/5 GHz) 802.11ax WiFi 6, 802.11b/g/n WiFi 4 backward compatibility WiFi modes: Station mode, SoftAP mode, SoftAP + Station mode, and promiscuous mode Bluetooth 5.0 Low Energy (LE) with Mesh support, up [...] The post ESP32-C5 Pico board follows Raspberry Pi Pico form factor, ships with on-board or external antenna appeared first on CNX Software - Embedded Systems News. ## XIAO SAMD21 Plus and RP2040 Plus USB-C boards get additional GPIO pins, integrated Li-ion battery management DevFeed: [XIAO SAMD21 Plus and RP2040 Plus USB-C boards get additional GPIO pins, integrated Li-ion battery management]() Original publisher: [Read original article]() Author: Jean-Luc Aufranc (CNXSoft) Published: 2026-09-07T01:07:22Z Content type: news Language: en Sources: [CNX Software - Embedded Systems News]() Topics: [Embedded Systems](), [Microcontroller](), [USB](), [Raspberry Pi]() Tags: [arm](), [atmel-samd](), [battery](), [boot](), [circuitpython](), [development-board](), [embedded-systems](), [gpio](), [hardware](), [i2c](), [led](), [mcu](), [micropython](), [raspberry-pi](), [rust](), [seeed-studio](), [software](), [usb](), [zephyr](), [zephyr-os]() ### AI overview Seeed Studio has expanded its XIAO Plus Series with the XIAO SAMD21 Plus and XIAO RP2040 Plus USB-C boards. The boards retain the existing form factor while adding GPIO pins and integrated Li-ion battery management, and support several embedded development platforms. ### Source excerpt Seeed Studio has expanded its XIAO Plus Series introduced in 2025, with the XIAO SAMD21 Plus and XIAO RP2040 Plus USB-C boards adding several GPIOs and integrated Li-ion battery management to the XIAO (SAMD21) and XIAO RP2040, launched in 2020 and 2021, respectively, while keeping the same form factor. XIAO SAMD21 Plus Specifications: MCU - Microchip SAMD21G18 Arm Cortex-M0+ microcontroller at up to 48MHz with 256KB Flash,32KB SRAM USB - 1x USB Type-C port for power and programming Expansion I/Os 2x 7-pin "legacy" headers with 11x analog inputs, 11x digital I/Os, 1x DAC, SPI, UART, and I2C Castellated holes and pads with 16x digital I/Os, I2C,and I2S 3.3V I/O voltage (not 5V tolerant) Misc Reset and Boot buttons RGB LED Charge LED Power Supply 5V via USB-C port Pads for battery On-board PMIC Dimensions - 23.5x17.5 mm Temperature Range - -40°C ~ 85°C The upgraded variant of the XIAO SAMD21 [...] The post XIAO SAMD21 Plus and RP2040 Plus USB-C boards get additional GPIO pins, integrated Li-ion battery management appeared first on CNX Software - Embedded Systems News. ## Pico Space Pro Appears To Receive FCC Certification Following Delay To Q4 DevFeed: [Pico Space Pro Appears To Receive FCC Certification Following Delay To Q4]() Original publisher: [Read original article]() Author: Luna Published: 2026-09-05T23:39:38Z Content type: news Language: en Sources: [UploadVR]() Topics: [Hardware](), [Software]() Tags: [battery](), [compute](), [fcc](), [headsets-tech](), [product-launch](), [regulatory](), [release](), [release-schedule](), [space]() ### AI overview Pico Space Pro, an upcoming mixed-reality headset, appears to have received FCC certification after its launch was postponed to the fourth quarter of 2026. The article reports that FCC filings reveal a tethered compute and battery puck. ### Source excerpt A new Pico device, highly likely the upcoming Space Pro, received FCC certification following a delay to Q4. Filings reveal a tethered compute and battery puck. ## 3 ways to optimize Firebase Remote Config fetch usage DevFeed: [3 ways to optimize Firebase Remote Config fetch usage]() Original publisher: [Read original article]() Author: Sumit Chandel; Siddhant Jain Published: 2026-08-31T00:00:00Z Content type: tutorial Language: en Sources: [Firebase Blog]() Topics: [Firebase](), [App](), [configuration](), [Latency](), [Network](), [cross-platform]() Tags: [a-b-testing](), [battery](), [best-practices](), [feature-rollouts](), [firebase](), [firebase-remote-config](), [latency](), [network](), [pricing](), [remote-config]() ### AI overview This article presents three strategies for reducing Firebase Remote Config fetch traffic. It explains how smarter fetch and activation patterns can reduce network overhead, latency, battery consumption, and usage-based costs. ### Source excerpt Reduce network fetches, battery consumption and usage costs ## Building a mini Homelab that fits in my carry-on DevFeed: [Building a mini Homelab that fits in my carry-on]() Original publisher: [Read original article]() Author: jeff@jeffgeerling.com (Jeff Geerling) Published: 2026-08-28T15:00:00Z Content type: opinion Language: en Sources: [Jeff Geerling]() Topics: [Homelab](), [networking](), [Ubiquiti](), [Local-First](), [Hardware](), [SOC]() Tags: [5g](), [arm](), [battery](), [building](), [cloud](), [ethernet](), [fees](), [hardware](), [homelab](), [linux](), [local-first](), [networking](), [opnsense](), [portable](), [ubiquiti](), [unifi](), [video](), [vpn](), [youtube]() ### AI overview The author describes building a portable homelab that fits in carry-on luggage for a trip to Chicago. It supports 1-10 Gbps networking, battery operation, multiple WAN connections, and 12 wired Ethernet connections. The article also shares first impressions of Ubiquiti UniFi, highlighting its local-first operation, optional cloud integration, lack of core licensing fees, and easy web-based management, while criticizing its proprietary ecosystem and limited hardware control. ### Source excerpt I'm traveling to Chicago for VCF Midwest next month. I'll be demoing NTP time history on vintage Macs, with my own GPS-derived NTP service hosted on an Xserve G5, synced via NTP or a strange AppleTalk timing extension from the 1990s. So I built a little 'portable homelab' (pictured above) that supports 1-10 Gbps networking, can run off a small battery for at least an hour, switches between multiple WANs (so I can get my own 5G Internet connection, in case I need it), and gives me 12 wired Ethernet connections. ## Hot Chips 2026: Intel's Wildcat Lake DevFeed: [Hot Chips 2026: Intel's Wildcat Lake]() Original publisher: [Read original article]() Author: Chester Lam Published: 2026-08-24T19:50:30Z Content type: article Language: en Sources: [Chips and Cheese]() Topics: [intel](), [cpu](), [GPU](), [SOC](), [Bluetooth]() Tags: [2026](), [architecture](), [battery](), [bluetooth](), [core](), [cost](), [cpu](), [gpu](), [intel](), [platform](), [processors](), [soc](), [technologies](), [technology](), [wifi](), [wildcat-lake]() ### AI overview This article examines how Intel designed Wildcat Lake, also called Core Series 3, as a lower-cost mobile processor platform. It describes the use of new CPU cores, Xe3 graphics, IO, a multi-chip package, a distinct platform, and selected feature trade-offs to reduce costs while retaining capabilities important to battery life and connectivity. ### Source excerpt All about making things affordable ## Talking with Synopsys about the Physics of Chip Design at DAC 2026 DevFeed: [Talking with Synopsys about the Physics of Chip Design at DAC 2026]() Original publisher: [Read original article]() Author: George Cozma Published: 2026-08-11T16:52:16Z Content type: article Language: en Sources: [Chips and Cheese]() Topics: [Chip design](), [3D](), [Simulation and Design]() Tags: [3d](), [audio](), [automotive](), [battery](), [chip-design](), [communications](), [design](), [desktop](), [heat](), [interview](), [low-power](), [physics](), [techniques]() ### AI overview An edited audio interview with Synopsys executive Ravi Subramanian examines the physics involved in chip design and electronic design automation tools. The discussion covers larger chips, 2.5D and 3D multi-die integration, thermal management, low-power mobile systems, and automotive operating environments. ### Source excerpt Hello you fine Internet folks, ## Network Rack for Small Office (Build Guide) DevFeed: [Network Rack for Small Office (Build Guide)]() Original publisher: [Read original article]() Author: Hayden James Published: 2026-06-22T12:58:14Z Content type: tutorial Language: en Sources: [Hayden James]() Topics: [Network](), [Hardware](), [Firewall]() Tags: [battery](), [blog](), [community-forums](), [general](), [guide](), [hardware](), [home-office](), [homelab](), [network](), [outages](), [router](), [sysadmins](), [unifi]() ### AI overview A build guide describes equipping a small professional office with a wheeled 20U network rack, UniFi networking equipment, UPS units, modular patching, cable management, and 10G connectivity. The design emphasizes keeping key services online during power interruptions and allowing future expansion. ### Source excerpt Last week I walked into an empty 5 x 4 ft storage room. By the end of the week, that blank space held a fully functional network core designed to keep a small professional office online through power cuts, ISP hiccups, and future growth. Continue reading... ## Sensereo joins Works with Home Assistant DevFeed: [Sensereo joins Works with Home Assistant]() Original publisher: [Read original article]() Author: Miranda Bishop Published: 2026-05-28T00:00:01Z Content type: news Language: en Sources: [Home Assistant]() Topics: [Home Assistant](), [Matter](), [Network]() Tags: [2026](), [battery](), [ecosystem](), [matter](), [products](), [safety](), [sensors](), [smart-home](), [thread](), [wireless](), [works-with-home-assistant]() ### AI overview Sensereo has joined the Works with Home Assistant program with Matter-based MS-1 smoke alarms and MSC-1 smoke and carbon monoxide alarms. The article explains how Matter and Thread support open, interoperable, energy-efficient smart-home devices while the alarms continue operating as regular alarms if the Thread network fails. Sensereo also plans to develop air quality sensors and other environmental sensing devices. ### Source excerpt We're sensing a change in the air this month as we welcome Sensereo to the Works with Home Assistant program 🎉. Specialists in environmental sensing, Sensereo brings Matter smoke and carbon monoxide (CO) alarms into the Home Assistant ecosystem - meaning more ways to keep your home open, safe, and sound. Built from a burning question... What happens if your smoke alarm goes off, but you're not there to hear it? It's an unsettling question, and one that led Roy Chen to found Sensereo in 2024. Driven to create safety devices that were equal parts reliable and resilient, Sensereo built the Matter-based MS-1 Smoke Alarm and MSC-1 Smoke and Carbon Monoxide Alarm, because as they put it: "every home deserves a system that will not fall silent when it matters most." It's just good sense For anyone unfamiliar, Matter is an open standard that lets smart home devices from different brands work together, regardless of who made them - no lock-in, no closed ecosystems. It's exactly the kind of open, interoperable technology the Open Home Foundation exists to champion. Thread operates on the same principle: it's an energy-efficient, wireless mesh network that connects devices directly to one another and can automatically reroute around disruptions. And for battery-powered alarms like Sensereo's, Thread's low-power design means fewer battery changes for devices that are always on duty. While we're talking about safety, it's important to note that if your Thread network did for any reason drop out, Sensereo's smoke and CO alarms will keep working as a "regular" alarm would - no smart home required. That peace of mind is central to how Sensereo thinks about their products, and having caught up with the team at CES 2026 earlier this year, we can tell you it's just the beginning. Air quality sensors and more are on the horizon, all building toward the same vision: to build an environmental intelligence system for the home that helps users understand and respond to their surroundings. "J ## Building Svitgrid, a Solar Monitoring Platform for Home Systems DevFeed: [Building Svitgrid, a Solar Monitoring Platform for Home Systems]() Original publisher: [Read original article]() Author: Ivan Ursul Published: 2026-05-21T00:00:00Z Content type: article Language: en Sources: [Ivan Ursul]() Topics: [Monitoring](), [dashboards](), [real-time](), [Fastify](), [Flutter](), [Modbus](), [TypeScript](), [Cloud Run](), [ESP-IDF](), [ESP32-S3](), [Firestore](), [Mobile]() Tags: [android](), [battery](), [cloud-run](), [energy-monitoring](), [esp-idf](), [esp32](), [esp32-s3](), [firestore](), [flutter](), [gcp](), [iot](), [java](), [migrations](), [mobile](), [modbus](), [mongodb](), [monitoring](), [real-time](), [side-project](), [solar](), [typescript](), [web]() ### AI overview This article explains how Svitgrid, a solar monitoring platform for residential systems, was built. It covers the product's goals, cross-platform clients, cloud backend, ESP32-S3 edge hardware, inverter data paths, and support for multiple inverter systems over Modbus TCP. ### Source excerpt Svitgrid dashboard: real-time power flow from PV to battery, home, and grid ## zunzunbee joins Works with Home Assistant DevFeed: [zunzunbee joins Works with Home Assistant]() Original publisher: [Read original article]() Author: Miranda Bishop Published: 2026-05-19T00:00:01Z Content type: article Language: en Sources: [Home Assistant]() Topics: [Home Assistant](), [Automation](), [systems]() Tags: [2026](), [automation](), [battery](), [complexity](), [cost](), [devices](), [homes](), [installation](), [lighting](), [local](), [product](), [smart](), [smart-home](), [works-with-home-assistant]() ### AI overview Home Assistant announces that zunzunbee has joined its Works with Home Assistant program. The company's Slate Switch is a battery-powered smart scene controller that snaps over existing switches, supports tactile local control, and can be used as a portable remote. It is designed to simplify smart-home installation while keeping smart bulbs powered and preserving automations. ### Source excerpt We are often asked if we prioritize "Big Tech" firms in the Works with program, but we've always been clear that newer companies are just as important to our certification as household names. Start-ups are innovators, and have their fingers on the pulse of community needs much more than brands that are only at the mercy of their investors. That's just one reason we're thrilled to welcome zunzunbee to the program! They really stood out from the crowd at CES 2026 this January with their new product, the Slate Switch. This battery-powered smart scene controller simply snaps over existing switches - ideal if you rent your home, or don't fancy working with wiring. We're always on the lookout for devices that make setting up your smart home easier, so we're delighted to have zunzunbee on board! A clean slate for switches While zunzunbee are newcomers to the market, founder Harish Raman has more than 18 years' experience in lighting and connected systems - including senior engineering roles at Leviton and Philips. Harish designed the Slate Switch to cut the complexity sometimes found in smart homes, by bringing back simple, tactile control without any installation headaches. And because it builds on top of your existing switches rather than replacing them, it means less waste and more value from the things you already own. "At zunzunbee, we believe smart home control should feel natural, reliable, and stay under the user's control. The Home Assistant community shares that same philosophy, with a focus on local control, flexibility, and deep customization. Slate Switch was designed to solve everyday friction in smart homes, and we are excited to bring it to a community that values thoughtful automation and truly understands how homes should work." - Harish Raman, Founder Not just for newbies The Slate Switch isn't just a low-barrier entry point for beginners. It also tackles an issue that can crop up in more complex smart home setups: someone flipping a wall switch that con ## ubisys joins Works with Home Assistant DevFeed: [ubisys joins Works with Home Assistant]() Original publisher: [Read original article]() Author: Miranda Bishop Published: 2026-04-23T00:00:01Z Content type: news Language: en Sources: [Home Assistant]() Topics: [Home Assistant](), [Automation](), [Hardware](), [interoperability](), [Network]() Tags: [automation](), [battery](), [community](), [devices](), [hardware](), [home-automation](), [innovation](), [integration](), [interoperability](), [mesh](), [network](), [open](), [partnership](), [standards](), [sustainability](), [updates](), [wireless](), [works-with-home-assistant](), [zigbee]() ### AI overview The article announces that ubisys has joined Works with Home Assistant. It describes ubisys's Zigbee smart home devices for retrofitting, their long hardware and software support, and the company's involvement in developing open standards and improving interoperability with Home Assistant. ### Source excerpt We're thrilled to welcome ubisys to Works with Home Assistant! This German company has been dedicated to smart home automation for more than 20 years, and offers a range of Zigbee devices designed to help you retrofit your home. If retrofitting is conjuring up images of avocado bathrooms 🥑 and artexed ceilings, fear not - it just means upgrading what you already have, rather than ripping it out and starting again. Better for your home, and the planet 🌍. Here today, here tomorrow Founded in Düsseldorf in 2005, ubisys build devices that last. They back their hardware with a five-year warranty and software updates for the long term, meaning the device you buy today won't end up obsolete in a few years' time - in fact, they're still shipping feature updates for hardware designed in 2010! That kind of longevity aligns closely with the Open Home Foundation's own sustainability principle, and is just one reason why they're such a great (retro)fit for the program! Zigbee is another... Zigbee to the bone If you're scratching your head at the mention of Zigbee, allow me to explain: it's a wireless standard that lets smart home devices communicate with each other, regardless of who made them. Unlike WiFi, it's a mesh network, meaning Zigbee devices "talk" to each other, as well as to a central hub (like your Home Assistant setup), strengthening the connection across your whole home. It runs entirely locally, with no cloud dependency, and is optimized for long battery life. For retrofit devices that need to just get on with their jobs in the background, these qualities really count, and explains why ubisys refer to Zigbee as the backbone of everything they build. And they don't just use the standard, they help shape it: ubisys are active members of the Connectivity Standards Alliance (the organization responsible for maintaining and developing Zigbee), sitting on working groups and committees at the highest level - helping improve the standard for the benefit of the whole communi ## SOTA OCR with Core ML and dots.ocr DevFeed: [SOTA OCR with Core ML and dots.ocr]() Original publisher: [Read original article]() Author: Christopher Fleetwood; Pedro Cuenca Published: 2025-10-02T00:00:00Z Content type: tutorial Language: en Sources: [Hugging Face - Blog]() Topics: [MLX](), [PyTorch]() Tags: [apple](), [architecture](), [battery](), [coreml](), [cpu](), [developers](), [framework](), [gpu](), [high-performance](), [images](), [mlx](), [model](), [ocr](), [on-device](), [parameter](), [precision](), [pytorch](), [repo](), [tools](), [vision]() ### AI overview This tutorial explains how to convert dots.ocr from PyTorch to Core ML for on-device execution on Apple hardware. It discusses the roles of the Neural Engine, GPU, MLX, and Core ML, then outlines a staged conversion process beginning with GPU execution, FLOAT32 precision, and static shapes. ### Source excerpt We're on a journey to advance and democratize artificial intelligence through open source and open science. ## Implementing a Deep-sleep wake stub application on Espressif chips to enable power-efficient IoT devices DevFeed: [Implementing a Deep-sleep wake stub application on Espressif chips to enable power-efficient IoT devices]() Original publisher: [Read original article]() Author: John Lee Published: 2025-09-02T00:00:00Z Content type: tutorial Language: en Sources: [Blog on Developer Portal]() Topics: [Internet of things](), [Espressif](), [Boot Process](), [cpu](), [SOC]() Tags: [battery](), [blog](), [boot-process](), [deep-sleep-wake-stub](), [esp-idf](), [esp32-c6](), [espressif](), [gpio](), [how-to](), [i2c](), [iot](), [low-power](), [spi]() ### AI overview This tutorial explains how Deep-sleep wake stubs work on Espressif chips and demonstrates how to build an application using GPIO, UART, I2C, and SPI. Wake stubs can skip most of the boot sequence after deep-sleep reset, enabling faster wake-up and lower power use for short tasks. ### Source excerpt In this article, we first explain the principles behind the Deep-sleep wake stub application and then demonstrate how to implement GPIO, UART, I2C, and SPI within it. ## TRMNL DevFeed: [TRMNL]() Original publisher: [Read original article]() Author: Adam Langley Published: 2025-07-27T00:00:00Z Content type: opinion Language: en Sources: [ImperialViolet]() Topics: [e-ink](), [Microcontroller](), [Cloud Run](), [Go Language](), [JSON](), [HTTP]() Tags: [battery](), [e-ink](), [firmware](), [http](), [program](), [usb](), [wi-fi]() ### AI overview A review of the TRMNL, an 800x600, 1-bit e-ink display powered by a battery and microcontroller. The article describes its firmware and server customization, tile-based display service, Liquid templating, and a Go program on Cloud Run that displays family calendar events. It also notes refresh-scheduling difficulties and the device's relatively high cost. ### Source excerpt The TRMNL is an 800x600, 1-bit e-ink display connected to a battery and a microcontroller, all housed in a nice but unremarkable plastic case. Because the microcontroller spends the vast majority of the time sleeping, and because e-ink displays don't require power unless they're updating, the battery can last six or more months. It charges over USB-C. When the microcontroller wakes up, it connects to a Wi-Fi network and communicates with a pre-configured server to fetch an 800x600 image to display, and the duration of the next sleep. You can flash your own firmware on the device, or point the standard firmware at a custom server. The company provides an example server, although you can implement the (HTTP-based) protocol in whatever way you wish. I considered running my own server, but thought I would give the easy path a try first to see if it would suffice. The default service lets you split the display into several tiles, and there are a number of pre-built and community-built things that can display in each. None of them worked well for me, but that's okay because you can create your own private ones. They get data either by polling a given URL, or by having data posted to a webhook. The layout is rendered using the Liquid templating system, which I had not used before, but it's reasonably straightforward. I wrote a Go program hosted on Cloud Run which fetches the family shared calendar and converts events from the next week into a JSON format designed to make it trivial to render in the templating system. With a 3D-printed holder, super glue, and some magnets, it's now happily stuck to the fridge where it displays the current date and the family events for the next week. The most awkward part of the default service is managing the refreshes. The device has a sleep schedule, and so do the tiles, which are only updated periodically. So the combination can easily leave the wrong day showing. It would be helpful if the service told you when the device would next up ## Building low power applications on Espressif chips: Ultra-Low-Power (ULP) coprocessor DevFeed: [Building low power applications on Espressif chips: Ultra-Low-Power (ULP) coprocessor]() Original publisher: [Read original article]() Author: John Lee Published: 2025-04-02T06:05:59Z Content type: tutorial Language: en Sources: [Blog on Developer Portal]() Topics: [Espressif](), [Tutorial](), [ESP-IDF](), [ESP32-C6](), [Microcontroller](), [ESP32](), [Hardware](), [Programming]() Tags: [battery](), [blog](), [boot](), [esp-idf](), [esp32](), [esp32-c6](), [espressif](), [hardware](), [low-power](), [lp-core](), [programming](), [ulp]() ### AI overview This article introduces Ultra-Low-Power coprocessors in Espressif chips and presents a tutorial for using them to reduce application power consumption. It focuses on the LP-Core available on the ESP32-C6 and uses ESP-IDF v5.4. ### Source excerpt In this article, we'll start with a quick overview of Ultra Low Power coprocessors (ULPs) in Espressif chips and how they can significantly reduce power consumption in your applications. Then, we'll walk through a tutorial on how to use ULPs in practice! ## ESP-Knob: A multifunctional smart controller with the ESP32-H2 DevFeed: [ESP-Knob: A multifunctional smart controller with the ESP32-H2]() Original publisher: [Read original article]() Author: John Lee Published: 2025-03-27T10:37:17Z Content type: article Language: en Sources: [Blog on Developer Portal]() Topics: [ESP32](), [Hardware](), [Embedded Software Dev](), [interoperability](), [Home Assistant](), [Matter](), [Espressif]() Tags: [battery](), [ble](), [ble-adv](), [ble-hid](), [ble-mesh](), [blog](), [debugging](), [esp32](), [esp32-h2](), [espressif](), [firmware](), [hardware](), [home-assistant](), [matter](), [re](), [usb](), [zigbee]() ### AI overview The article introduces Espressif's ESP-Knob, a multifunctional smart controller powered by the ESP32-H2. It describes support for Home Assistant and wireless protocols including BLE-HID, Thread, Matter, ESP-BLE-MESH, and Zigbee, along with its push-rotary control, magnetic base, and battery or USB power options. ### Source excerpt This article provides an overview of the ESP-Knob, its features, and functionality. It also details the hardware design and outlines the firmware framework that supports its operation. ## Advancing Fall Detection: Crafting a Custom PCB for the Raspberry Pi Zero 2W DevFeed: [Advancing Fall Detection: Crafting a Custom PCB for the Raspberry Pi Zero 2W]() Original publisher: [Read original article]() Author: Ivan Ursul Published: 2024-11-26T00:00:00Z Content type: tutorial Language: en Sources: [Ivan Ursul]() Topics: [Raspberry Pi](), [Altium Designer]() Tags: [battery](), [circuit](), [components](), [design](), [elderly-care](), [fall-detection](), [java](), [machine-learning](), [migrations](), [mongodb](), [pcb](), [power-management](), [prototypes](), [raspberry-pi](), [transformers]() ### AI overview This article describes designing and fabricating a custom PCB for a Raspberry Pi Zero 2W-based fall-detection device. It covers sensor selection, compact board layout, Altium Designer schematics, and power-management considerations. ### Source excerpt Schematics of the PCB module In my previous post, Developing a Fall Detection Device with Raspberry Pi, I delved into the initial steps of building a fall detection system using the Raspberry Pi Zero 2W. Today, I'm excited to share the next phase of this journey: designing and fabricating a custo... ## DIY Smart Electric Toothbrush using ESP32-C2 and RainMaker DevFeed: [DIY Smart Electric Toothbrush using ESP32-C2 and RainMaker]() Original publisher: [Read original article]() Author: John Lee Published: 2024-08-22T09:00:17Z Content type: tutorial Language: en Sources: [Blog on Developer Portal]() Topics: [ESP32](), [Esp32 C2](), [Esp Rainmaker](), [FIRST](), [Wi-Fi](), [Embedded Software Dev](), [USB]() Tags: [battery](), [blog](), [build](), [circuit](), [components](), [connectivity](), [data](), [devices](), [display](), [diy](), [esp](), [esp-rainmaker](), [esp32](), [esp32-c2](), [firmware](), [interface](), [lcd](), [motor](), [network](), [rainmaker](), [spi](), [toothbrush]() ### AI overview This article presents the ESP-Toothbrush, a smart electric toothbrush powered by Espressif's ESP32-C2. It describes the LCD, ultrasonic motor, buzzer, Wi-Fi and ESP-RainMaker integration, smartphone configuration, USB Type-C connectivity, firmware updates, charging, and supported power modes. ### Source excerpt Introduction# For most people, one of the first tasks of the day is toothbrushing. This task is usually done by a conventional nylon toothbrush, invented in 1938 but used in different forms and materials even before. Today, you can easily find electronic toothbrushes and some start toothbrushes that helps you to keep track how you are brushing your tooth. ## Using ESP-NOW in Arduino DevFeed: [Using ESP-NOW in Arduino]() Original publisher: [Read original article]() Author: John Lee Published: 2024-08-06T00:00:00Z Content type: tutorial Language: en Sources: [Blog on Developer Portal]() Topics: [Arduino](), [ESP32](), [Library](), [P2P](), [Protocol (disambiguation)](), [Low Latency](), [Programming](), [Encryption](), [Internet of things]() Tags: [arduino](), [arduino-ide](), [article](), [automation](), [battery](), [blog](), [c-plus-plus](), [communication](), [encryption](), [esp-now](), [esp32](), [esp32-c3](), [esp32-c6](), [esp32-s2](), [esp32-s3](), [examples](), [getting-started](), [how-to](), [iot](), [latency](), [low-power](), [microcontrollers](), [networks](), [scalability](), [sensor](), [wi-fi](), [wireless]() ### AI overview This tutorial explains how to use the ESP-NOW library included in Arduino 3.0.0 with supported ESP32 boards. It covers the protocol's connectionless peer-to-peer communication, low-latency and low-power characteristics, security features, prerequisites, and basic setup using Arduino and C++. ### Source excerpt This article presents information on how to use ESP-NOW with the Arduino core for Espressif devices. ## How to shutdown FreeBSD laptop when running out of battery power DevFeed: [How to shutdown FreeBSD laptop when running out of battery power]() Original publisher: [Read original article]() Author: Vivek Gite Published: 2024-07-28T11:28:02Z Content type: tutorial Language: en Sources: [nixCraft: Linux Tips, Hacks, Tutorials, And Ideas In Blog Format (RSS/FEED)]() Topics: [freebsd](), [Script](), [Command-line interface](), [Shell](), [Terminal](), [email](), [Process](), [Amazon Web Services]() Tags: [battery](), [cli](), [command-line](), [easy](), [email](), [freebsd](), [how-to](), [laptop](), [power](), [process](), [script](), [server](), [shell]() ### AI overview This tutorial shows how to monitor battery status on a FreeBSD laptop with sysctl, send alerts through email or a mobile API, and run a background shell script from cron to shut down the laptop when power is critically low. ### Source excerpt Email alert example before FreeBSD-based laptop will be shutdown by the script Email alert example before FreeBSD-based laptop will be shutdown by the script Email alert example before FreeBSD-based laptop will be shutdown by the script Email alert example before FreeBSD-based laptop will be shutdown by the script Email alert example before FreeBSD-based laptop will [...] Love this? sudo share_on: Twitter - Facebook - LinkedIn - Whatsapp - Reddit The post How to shutdown FreeBSD laptop when running out of battery power appeared first on nixCraft. 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