Ultra-small core board compatible with Arduino Nano/UNO (3.3V@8MHz), adding some additional features:
1. 3-axis accelerometer: ADXL345, accessed by I2C interface 2. 256B EEPROM: 24LC024, accessed by I2C interface 3. OLED screen can be plugged in, accessed by I2C interface
The project has been completed and the test passed
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