qunqi leonardo r3 development board microcontroller atmega32u4 for arduino + usb cable qunqi 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>