Arduino · AVR
Arduino Uno R3
The classic. Not powerful, but 5 V-tolerant, forgiving and supported by every beginner tutorial and shield ever made.
No wireless5 V logicUno
Typical price
$28
Clones from about $10
Ad space · top
Specifications
| Maker | Arduino |
|---|---|
| Chip | ATmega328P |
| CPU | 8-bit AVR |
| Clock speed | 16 MHz |
| Wi-Fi | None |
| Bluetooth | None |
| Zigbee / Thread radio | No |
| GPIO pins | 20 usable |
| ADC | 6 channels, 10-bit |
| DAC | None |
| Flash | 32 KB |
| RAM | 2 KB |
| Logic level | 5 V |
| Power input | 7–12V barrel / 5V USB |
| Deep sleep (typ.) | ~30 mA |
| Active current (typ.) | ~45 mA |
| Form factor | Uno |
| USB | USB-B (ATmega16U2) |
| Programming | Arduino C++ |
| Released | 2010 |
Typical values. Sleep current is approximate; whole-board numbers are higher than the bare chip's datasheet figure.
Pros
- 5 V logic works directly with lots of old modules
- Gigantic shield and tutorial ecosystem
- Very hard to break for a beginner
Cons
- 32 KB flash and 2 KB RAM are tiny
- No wireless and slow 16 MHz AVR
- Terrible for battery projects once the board is counted
Best use cases
- 01Learning electronics and C++
- 02Robot kits and school projects
- 03Driving shields (motor, LCD, relay)
- 04Quick 5 V prototypes
Ad space · inline