1. Single chipboard model: ATmega32A

2. Power supplied by mini USB or plug pin, on-board AMS117-3.3 Chipset;

3. On-board external 8M crystal board; Can be adjustable as you need.

4. All IO port are leaded out and marked;

5. On-board ISP interface;

6. Resettable circuit;

7. The Filter inductor and capacitor was applied to the AD converter reference voltage.