Tiny ESP32 powered dev kit with a built in 5x5 RGB LED matrix, which also functions as a programmable button. At only 24x24mm, it's great for fitting into projects where space is at a premium! These little fellas would be super for incorporating into all sorts of projects which would benefit from a smart, wifi connected button that's capable of showing visual feedback. You could set up an IoT thermostat system, use one as as a synth controller, or as a calendar connected busy light/doorbell for your home office. It's programmable via Arduino IDE, but also by the graphical drag and drop programming interface UIFlow, ideal for folks new to ESP32 microcontrollers. If you don't need the LEDs, we sell the basic ATOM here , and we also stock a compatible plug and play battery! For more information and for help getting started, click here Features * ESP32-PICO-D4 chip * Onboard wifi and Bluetooth * 4MB of integrated SPI flash memory * Programmable button * 5 x 5 RGB LED matrix panel * Built-in Infra-red LED * Built-in MPU6886 Inertial Sensor * Six GPIO connectors for attaching to external sensors * PH2.0 interface * On-board USB-C interface for programming * Program Platform: Arduino / UIFlow NOTE: The brightness of RGB LED is limited to 20. Setting it higher risks damaging the LED and acrylic screen. One M2 screw hole is provided on the back for mounting the board. Specifications Resource Parameter ESP32 240MHz dual core, 600 DMIPS, 520KB SRAM, Wi-Fi, dual mode Bluetooth Flash 4MB Power Input 5V @ 500mA Port TypeC x 1, GROVE (I2C+I/0+UART) x1 PIN Port G19, G21，G22，G23，G25, G33 RGB LED WS2812B x 25 MEMS MPU6886 IR Infrared transmission Button Custom button x1 Antenna 2.4G 3D Antenna Operating Temperature 32°F to 104°F ( 0°C to 40°C ) Size 24 x 24 x 14 mm Weight 14g Case Material Plastic ( PC ) https://elecena.pl/product/22719607/m5stack-atom-matrix-esp32 2023-03-07 https://elecena.pl/product/22719607/m5stack-atom-matrix-esp32 2023-12-27 https://elecena.pl/product/22719607/m5stack-atom-matrix-esp32 2024-09-19 https://elecena.pl/product/22719607/m5stack-atom-matrix-esp32 2024-11-29 https://elecena.pl/product/22719607/m5stack-atom-matrix-esp32 2024-11-30 https://elecena.pl/product/22719607/m5stack-atom-matrix-esp32 2025-04-30 https://elecena.pl/product/22719607/m5stack-atom-matrix-esp32 2025-11-28 https://elecena.pl/product/22719607/m5stack-atom-matrix-esp32 2025-11-29