# I2C multiplexer

Published articles for I2C multiplexer.

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## Another IKEA Product Yields an LED Matrix

DevFeed: [Another IKEA Product Yields an LED Matrix](<https://devfeed.tech/articles/another-ikea-product-yields-an-led-matrix-84517.md>)

Original publisher: [Read original article](<https://hackaday.com/2026/10/10/another-ikea-product-yields-an-led-matrix/>)

Author: Jenny List

Published: 2026-10-10T08:00:36Z

Content type: article

Language: en

Sources: [Hackaday](<https://devfeed.tech/sources/hackaday.md>)

Topics: [cortex m4](<https://devfeed.tech/topics/cortex-m4.md>)

Tags: [firmware](<https://devfeed.tech/tags/firmware.md>), [i2c](<https://devfeed.tech/tags/i2c.md>), [i2c-multiplexer](<https://devfeed.tech/tags/i2c-multiplexer.md>), [ikea](<https://devfeed.tech/tags/ikea.md>), [kortlinje](<https://devfeed.tech/tags/kortlinje.md>), [led](<https://devfeed.tech/tags/led.md>), [led-hacks](<https://devfeed.tech/tags/led-hacks.md>), [led-matrix](<https://devfeed.tech/tags/led-matrix.md>), [microcontroller](<https://devfeed.tech/tags/microcontroller.md>)

### AI overview

The IKEA Kortlinje digital clock contains a white LED matrix controlled by three VK1640 drivers. The article describes its unidentified microcontroller, possible I2C multiplexer, sensors, and the potential to replace the microcontroller with custom firmware.

### Source excerpt

The IKEA Kortlinje is a digital clock that costs around 20 dollars, featuring a hygrometer and thermometer. It's another cheap appliance, you might think, were it not that the display ...read more

## Wrap Around Display ESP32 Watch #WearableWednesday

DevFeed: [Wrap Around Display ESP32 Watch #WearableWednesday](<https://devfeed.tech/articles/wrap-around-display-esp32-watch-wearablewednesday-58746.md>)

Original publisher: [Read original article](<https://blog.adafruit.com/2026/09/23/wrap-around-esp32-display-watch-wearablewednesday/>)

Author: Ben

Published: 2026-09-23T18:50:29Z

Content type: article

Language: en

Sources: [Adafruit Industries](<https://devfeed.tech/sources/adafruit-industries-makers-hackers-artists-designers-and-engineers.md>)

Topics: [ESP32](<https://devfeed.tech/topics/esp32.md>), [Arduino](<https://devfeed.tech/topics/arduino.md>)

Tags: [3d-printing](<https://devfeed.tech/tags/3d-printing.md>), [adafruit](<https://devfeed.tech/tags/adafruit.md>), [display](<https://devfeed.tech/tags/display.md>), [displays](<https://devfeed.tech/tags/displays.md>), [electronics](<https://devfeed.tech/tags/electronics.md>), [esp32](<https://devfeed.tech/tags/esp32.md>), [i2c](<https://devfeed.tech/tags/i2c.md>), [i2c-multiplexer](<https://devfeed.tech/tags/i2c-multiplexer.md>), [oled](<https://devfeed.tech/tags/oled.md>), [project](<https://devfeed.tech/tags/project.md>), [version](<https://devfeed.tech/tags/version.md>), [watch](<https://devfeed.tech/tags/watch.md>), [wearable](<https://devfeed.tech/tags/wearable.md>), [wearable-wednesday](<https://devfeed.tech/tags/wearable-wednesday.md>), [wearables](<https://devfeed.tech/tags/wearables.md>)

### AI overview

Dan Chen created a wearable watch with a wraparound display using eight OLED displays, an Adafruit PCA9548 eight-channel STEMMA QT/Qwiic I2C multiplexer, and a small ESP32 board. A more compact second version is planned.

### Source excerpt

Dan Chen made this wrap around display watch. It uses 8 OLED displays, an Adafruit PCA9548 8-Channel STEMMA QT / Qwiic I2C Multiplexer, and is powered by a tiny ESP32 board. Chen references plans for a version two with a more compact form. See more details on Instagram! Here and Here See more of Chen's [...]