Description: <br> 1. Controller: ATmega32u4 <br> 2. goods recorded: 16 MHz <br> 3. Operating voltage: 5V <br> 4. Input Voltage (recommended) :7-12V <br> 5. Digital IO port: 22 (D0-D13, D14-MISO D15-SCK, D16-MOSI D18-23 [A0-A5) <br> 6. PWM channel: 7 (D3, D5, D6, D9, D10, D11, D13) <br> 7. analog input: 12 (A0-A5, D4-A6, D6-A7, D8-A8 ,-A9 D9, D10-A10, D12-A11) <br> 8. 5V digital / analog port maximum permissible current: 40 mA <br> 9. 3.3V digital / analog port maximum permissible current: 50 mA <br> 10. Flash Memory: 32 KB (ATmega32u4) of which 4 KB used by the bootloader <br> 11. SRAM: 2.5 KB (ATmega32u4) <br> 12. EEPROM: 1 KB (ATmega32u4 <br>