Description M5Stack AtomS3R Ext is a compact ESP32-S3 proto kit created for fast validation, interface testing, and practical embedded prototyping. The AtomS3R Ext gives M5Stack users a small but highly usable prototype development controller with a top-side prototype area, onboard sensors, and an expansion-friendly layout. Because the AtomS3R Ext combines the ESP32-S3-PICO-1-N8R8, sensor support, and breadboard-style expansion space, it works well as both an ESP32-S3 proto kit and a prototype development controller for smart device control, rapid hardware iteration, and compact embedded prototyping. For developers building custom M5Stack systems, the AtomS3R Ext is one of the cleanest ways to test new GPIO ideas in a very small form factor. Features M5Stack AtomS3R Ext structure optimized for compact embedded prototyping ESP32-S3 proto kit design based on ESP32-S3-PICO-1-N8R8 Top prototype area for flexible prototype development controller workflows BMI270 motion sensor and BMM150 geomagnetic sensor onboard Supports infrared output, external GPIO validation, and rapid smart device control experiments 3D antenna design for stronger wireless stability in M5Stack projects Supports Arduino, UIFlow, and MicroPython Specifications Item Details Brand M5Stack Model AtomS3R Ext SKU C126-Ext Main controller ESP32-S3-PICO-1-N8R8 Flash 8MB PSRAM 8MB Motion sensor BMI270 6-axis Geomagnetic sensor BMM150 3-axis Infrared Supported Expansion port HY2.0-4P Reserved GPIO G5/G6/G7/G8/G38/G39 Breadboard GPIO G3/G4/G9/G10/G11/G12/G13/G14/G17/G21/G40/G42/G46/G48 Power input USB Type-C Dimensions 24 x 24 x 12.9 mm Applications Embedded prototyping for compact controllers and sensor nodes Prototype development controller tasks that need quick GPIO access Smart device control validation and proof-of-concept hardware ESP32-S3 proto kit projects for motion, direction, and control testing M5Stack experiments that need a compact board with onboard sensors Product List 1 x M5Stack AtomS3R Ext Other Content Resources M5Stack AtomS3R Ext Official Documentation ESP32-S3-PICO-1-N8R8 Datasheet BMI270 Datasheet BMM150 Datasheet Official AtomS3R Ext Video FAQ What is AtomS3R Ext mainly used for?The AtomS3R Ext is an ESP32-S3 proto kit and a compact prototype development controller for M5Stack users who need faster embedded prototyping. Is AtomS3R Ext suitable for smart device control?Yes. The AtomS3R Ext is useful for smart device control, peripheral validation, custom GPIO testing, and motion-aware experiments. Why choose AtomS3R Ext for prototyping?The AtomS3R Ext combines an ESP32-S3 proto kit, prototype area, sensors, and compact M5Stack integration in one board.
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