Seeed Studio · SAMD21
Seeed XIAO SAMD21
A tiny, simple board with a real DAC and a friendly Arduino core. Great as a USB HID device or a reliable little sensor reader.
No wireless3.3 V logicTiny
Typical price
$5.40
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Specifications
| Maker | Seeed Studio |
|---|---|
| Chip | ATSAMD21G18 |
| CPU | Arm Cortex-M0+ |
| Clock speed | 48 MHz |
| Wi-Fi | None |
| Bluetooth | None |
| Zigbee / Thread radio | No |
| GPIO pins | 11 usable |
| ADC | 11 channels, 12-bit |
| DAC | 1 channel |
| Flash | 256 KB |
| RAM | 32 KB |
| Logic level | 3.3 V |
| Power input | 5V USB-C |
| Deep sleep (typ.) | ~100 µA |
| Active current (typ.) | ~10 mA |
| Form factor | Tiny |
| USB | USB-C (native) |
| Programming | Arduino, CircuitPython, MicroPython |
| Released | 2019 |
Typical values. Sleep current is approximate; whole-board numbers are higher than the bare chip's datasheet figure.
Pros
- True 10-bit DAC output
- Simple and reliable Arduino support
- Small and cheap
Cons
- Only 32 KB of RAM
- No wireless
- Slow compared with modern alternatives
Best use cases
- 01USB keyboards, mice and MIDI
- 02Analog signal generation
- 03Wearable sensor readers
- 04Compact Arduino projects
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