# Creating an environmental logger - Part 1

DevFeed: [Creating an environmental logger - Part 1](<https://devfeed.tech/articles/creating-an-environmental-logger-part-1-13780.md>)

Original publisher: [Read original article](<https://developer.espressif.com/blog/2026/07/basic-logger/>)

Author: John Lee

Published: 2026-07-15T00:00:00Z

Content type: tutorial

Language: en

Sources: [Blog on Developer Portal](<https://devfeed.tech/sources/blog-on-developer-portal.md>)

Topics: [ESP32](<https://devfeed.tech/topics/esp32.md>), [ESP-IDF](<https://devfeed.tech/topics/esp-idf.md>), [Logging](<https://devfeed.tech/topics/logging.md>), [Terminal](<https://devfeed.tech/topics/terminal.md>), [Internet of things](<https://devfeed.tech/topics/iot.md>), [data](<https://devfeed.tech/topics/data.md>), [Library](<https://devfeed.tech/topics/library.md>)

Tags: [article](<https://devfeed.tech/tags/article.md>), [blog](<https://devfeed.tech/tags/blog.md>), [esp-idf](<https://devfeed.tech/tags/esp-idf.md>), [esp32](<https://devfeed.tech/tags/esp32.md>), [filesystem](<https://devfeed.tech/tags/filesystem.md>), [how-to](<https://devfeed.tech/tags/how-to.md>), [i2c](<https://devfeed.tech/tags/i2c.md>), [iot](<https://devfeed.tech/tags/iot.md>), [logging](<https://devfeed.tech/tags/logging.md>), [sensor](<https://devfeed.tech/tags/sensor.md>), [vs-code](<https://devfeed.tech/tags/vs-code.md>)

## AI overview

This tutorial explains how to build an environmental logger with an ESP32-C61-Devkit-C, a DHT20 temperature and humidity sensor, and ESP-IDF. Part 1 covers reading the sensor over I2C and storing measurements in a little_fs filesystem on the module's flash memory.

## Source excerpt

This article shows how to create a simple environmental logger using the DHT20 sensor and store the data on a little_fs filesystem on the module's flash memory.