M5Stack AtomS3 Lite (C124) – ESP32-S3 development board

The AtomS3 Lite is the controller we use ourselves in most ESPHome projects. An ESP32-S3 with 8 MB flash, a Grove port, an RGB LED and a button under the case, all in a 24 × 24 mm package that fits behind a skirting board or in a small box.

Why it became our standard: it has enough memory for ESPHome without costing more than a basic ESP32 board, it flashes straight over USB-C with no button presses, and the Grove port lets you plug in a sensor in ten seconds.

Works with

• ESPHome (board config m5stack-atoms3)
• Home Assistant
• Arduino IDE, PlatformIO, UIFlow

You also need

A USB-C data cable. For sensors: a Grove cable, or Grove-to-Dupont if the sensor has loose pins.

Specifications

Documentation and certification

• Product documentation (M5Stack)
• Manufacturer certifications (CE/RED/RoHS)

Manufacturer: M5Stack Technology Co., Ltd, Block A10, Expo Bay South Coast, Fuhai Street, Bao'an District, Shenzhen, China, [email protected]. EU representative: Success Courier SL, Calle Rio Tormes 1, Planta 1, Derecha, Oficina 3, 28947 Fuenlabrada, Madrid, Spain, [email protected].

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