The board is relatively small, with EEPROM on board, 5 independent buttons, 5 LEDs, photoresistor, 18B20 temperature sensor, thermistor, potentiometer AD sampling, horn female socket can be directly connected to the ST-link interface, no wires required, serial port Debugging can be directly plugged into the computer and no wires are required. The original intention was to facilitate debugging the program and carry it with you.
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