title: Arduino Pro Mini description: Minimalist ATmega328P board with no USB and no DC jack. Two variants: 5 V/16 MHz and 3.3 V/8 MHz. Flash it with an external USB-TTL adapter (CP2102, FT232,...
Arduino Pro Mini¶
Minimalist ATmega328P board with no USB and no DC jack. Two variants: 5 V/16 MHz and 3.3 V/8 MHz. Flash it with an external USB-TTL adapter (CP2102, FT232, CH340).
In stock
CC-BY-SA-3.0
1 files · 613 KB
Specs¶
| Spec | 5 V version | 3.3 V version |
|---|---|---|
| MCU | ATmega328P | ATmega328P |
| Clock | 16 MHz | 8 MHz |
| Operating voltage | 5 V | 3.3 V |
| Input voltage (RAW) | 5–12 V | 3.35–12 V |
| Digital I/O | 14 (6 PWM) | 14 (6 PWM) |
| Analog inputs | 6 + 2 internal | 6 + 2 internal |
| Flash / SRAM / EEPROM | 32 KB / 2 KB / 1 KB | 32 KB / 2 KB / 1 KB |
Programming pinout (FTDI header)¶
Wire to USB-TTL adapter:
| Pro Mini | USB-TTL |
|---|---|
| GND | GND |
| VCC | VCC (match voltage!) |
| RXI | TX |
| TXO | RX |
| DTR | DTR |
Voltage match
Use a USB-TTL with selectable 3.3 V/5 V output. Feeding 5 V to a 3.3 V Pro Mini's VCC can fry it.
When to pick Pro Mini¶
- Battery / wearables (drop the USB chip, save current)
- Compact PCB footprint
- Already have a USB-TTL programmer
Schematic¶
Last updated: 2026-05-13 · Source on GitHub