Arduino Leonardo R3ΒΆ
The pinout on the Leonardo R3 is as follows:
| Arduino | GPIB connector | Function |
|---|---|---|
| A0 | 1 | DIO1 |
| A1 | 2 | DIO2 |
| A2 | 3 | DIO3 |
| A3 | 4 | DIO4 |
| D12 | 5 | EOI |
| D11 | 6 | DAV |
| D10 | 7 | NRFD |
| D9 | 8 | NDAC |
| D8 | 9 | IFC |
| D2 | 10 | SRQ |
| D7 | 11 | ATN |
| GND | 12 | Shield |
| A4 | 13 | DIO5 |
| A5 | 14 | DIO6 |
| D4 | 15 | DIO7 |
| D5 | 16 | DIO8 |
| D3 | 17 | REN |
| GND | 18,19,20,21,22,23 | GND |
The Leonardo R3 has a similar form factor to the Uno. It uses a 32u4 MCU rather than a
328P and has a micro USB port. Instead of a CH340 UART it uses USB CDC emulated serial
ports and has one separate hardware serial port available on on RX1 and TX1,
whereas the Uno shares these pins with USB. It requires no modification to work with
KE5FX tools. The board pin layout is the same as the Uno and the above pinout is
identical to the Uno.