You can't do a project without an Arduino. Here you'll find the Arduino Uno, Arduino Nano, Arduino Mega and Arduino Pro Mini
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Arduino Uno $ 2.85
Arduino Uno with cable $ 5.08
Arduino Uno (original) $ 10.11
Arduino Mega $ 7.09
Arduino Mega enclosure $ 3.13
Arduino Nano $ 3.03
Arduino Pro Mini 5V $ 3.03
3x Arduino Pro Mini 3.3V $ 3.03
USB Serieel Adapter CH340G TTL-UART $ 2.02