Nano Input Circuit
Connections
Board pin numbers are those printed on the board while code pin numbers need to be used in code (generally indicated in the pinout diagram as the GPIO pin number). They may be the same or different, depending on the board.
Board Pin | Code Pin | Pin Mode | Component | Pin |
|---|---|---|---|---|
| D0 | 0 | UART RX (code upload) | DO NOT USE | - |
| D1 | 1 | UART TX (code upload) | DO NOT USE | - |
| D2 | 2 | Digital In | Keypad | R4 |
| D3 | 3 | Digital In | Keypad | R3 |
| D4 | 4 | Digital In | Keypad | R2 |
| D5 | 5 | Digital In | Keypad | R1 |
| D6 | 6 | Digital In | Keypad | C1 |
| D7 | 7 | Digital In | Keypad | C2 |
| D8 | 8 | Digital In | Keypad | C3 |
| D9 | 9 | Digital In | Keypad | C4 |
| D10 | 10 | SPI CS | RFID Reader | SDA |
| D11 | 11 | SPI COPI | RFID Reader | COPI |
| D12 | 12 | SPI CIPO | RFID Reader | CIPO |
| D13 | 13 | SPI SCK | RFID Reader | SCK |
| A0 | A0 | Digital Out | RFID Reader | RST |
| A1 | A1 | Software UART RX | ESP32 | 13 (TX1) |
| A2 | A2 | Software UART TX | ESP32 | 14 (RX1) |
| A3 | A3 | Analog In | - | - |
| A4 | A4 | I2C SDA | I2C lCD | SDA |
| A5 | A5 | I2C SCL | I2C LCD | SCL |
| A6 | A6 | Analog In | - | - |
| A7 | A7 | Analog In | - | - |