AliExpress: 2$
| black | Mini | Arduino Nano | ATmega328P (old bootloader) | 32KB | 2KB | 20 | 2 | 1 | 1 | 0.127W |
| blue | Mini | Arduino Nano | ATmega328P (old bootloader) | 32KB | 2KB | 20 | 2 | 1 | 1 | 0.131W |
| red | Micro | Arduino Nano | ATmega168 | 16KB | 1KB | 20 | 2 | 1 | 1 | 0.127W |
i2c PINS
| GND | GND |
| VCC | 3V3 |
| SDA | A4 |
| SCL | A5 |
