<b>Specification</b><br> Controller: ATmega32u4<br> Working frequency: 16 MHz<br> Working voltage: 5V<br> Input voltage (recommended): 7-12v<br> Digital I/O port: 23<br> PWM channel: 7<br> Analog input: 12<br> Maximum allowable current of 5V digital/analog port: 40 mA<br> Maximum allowable current of 3.3V digital/analog port: 50 mA<br> Flash Memory: 32 KB (ATmega32u4) of which 4 KB used by boot loader<br> SRAM: 2.5 KB (ATmega32u4)<br> EEPROM: 1 KB (ATmega32u4)<br> <br> <b>Other related instructions</b><br> Digital IO port: 23 (D0 - D13, D14-MISO, D15-SCK, D16-MOSI, D18-23 [A0-A5])<br> Analog input: 12 (A0 - A5, D4 - A6, D6 - A7, D8 - A8, D9 - A9, D10 - A10, D12-A11)<br> Serial communication: D0 (RX) and D1 (TX)<br> IIC communication: D2 (SDA) and D3 (SCL)<br> External interrupt: D3 (interrupt 0), D2 (interrupt 1), D0 (interrupt 2), D1 (interrupt 3) and D7 (interrupt 4)<br> PWM port: D3, D5, D6, D9, D10, D11 and D13<br> SPI: ICSP pins.Support SPI communication by using the SPI library. It is important to note that SPI pins do not connect to any number I/O pins like UNO, they can only work on the ICSP port.This <br>means that if your expansion board has no ICSP pin connected to the 6 feet, it will not work.<br> LED: 13. There is a built-in LED on the digital pin 13. When the pins are high level, LED is bright;when the pins are low level,the LED is not bright.<br> <br> <b>List:</b><br> 1 x keyestudio Leonardo R3 Development Board <br> 1 x Usb Cable<br>