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Board overview
Arduino Pro Mini
Arduino · Classic
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Showing 32 of 32 pins
Simplified diagram, grouped by function — not to physical scale. Pin data is source-backed; verify against the linked documentation.
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Mapped source · Arduino Pro Mini retired-board documentationOfficial- Header labels follow Arduino's retired Pro Mini documentation and official schematic.
- The board was sold in 5 V / 16 MHz and 3.3 V / 8 MHz variants; match peripheral voltage to the exact board.
- A6 and A7 are analog-input-only ATmega328P pins; serial programming uses the 6-pin FTDI-style header.
All 32 pins
| # | Signal | Role | Net | Also / notes |
|---|---|---|---|---|
| Digital / communication | ||||
| 1 | UART | UART | PD0 / RXD | |
| 2 | UART | UART | PD1 / TXD | |
| 3 | GPIO | PD2 / INT0 | ||
| 4 | PWM | PD3 / INT1 | ||
| 5 | GPIO | PD4 | ||
| 6 | PWM | PD5 | ||
| 7 | PWM | PD6 | ||
| 8 | GPIO | PD7 | ||
| 9 | GPIO | PB0 | ||
| 10 | PWM | PB1 | ||
| 11 | SPI | SPI | PB2 | |
| 12 | SPI | SPI | PB3 / MOSI | |
| 13 | SPI | SPI | PB4 / MISO | |
| 14 | SPI | SPI | PB5 / LED | |
| Analog / power | ||||
| 14 | ADC | PC0 | ||
| 15 | ADC | PC1 | ||
| 16 | ADC | PC2 | ||
| 17 | ADC | PC3 | ||
| 18 | I2C | I2C | PC4 | |
| 19 | I2C | I2C | PC5 | |
| 20 | ADC | Analog input only. | ||
| 21 | ADC | Analog input only. | ||
| 22 | Power | RAW | ||
| 23 | Power | VCC | ||
| 24 | Ground | GND | ||
| 25 | System | |||
| Serial programming | ||||
| 1 | System | |||
| 2 | UART | UART | ||
| 3 | UART | UART | ||
| 4 | Power | VCC | ||
| 5 | System | UART | ||
| 6 | Ground | GND | ||