Open-source electronics prototyping platform
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Atmega328p Development Board + 9V 1A Power Supply Compatible with Arduino UNO R3
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UNO R3 Official Box ATMEGA16U2 / UNO+WiFi R3 Original ATMEGA328P Chip CH340G For Arduino UNO R3 Development Board WeMos ESP8266 - AliExpress
ELEGOO UNO R3 Board ATmega328P with USB Cable(Arduino-Compatible) for Arduino : Electronics