Compared to the Arduino Uno of old, modern microcontrollers are absolutely tiny — especially for the amount of processing power and I/O you get. But if you need something really small, like ...
Open-source modular DIN-rail home automation and sensor. ESP32-S3 core with Ethernet, Zigbee, RS485. 9 I/O modules via I2C: relays, contacts, energy meter, sprinklers. ESPHome-based, integrates Home ...
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