Spec: 1. High Sensitivity sensor 2. Using Nickel Plate for sensor 3. With Potentiometer for adjust sensitivitymenghasilkan sinyal Low 4. Using chip comparator LM39 5. Voltage Range: 3.3-5V Interface: 1. VCC: +3.3V-5V external power 2. GND: Ground 3. DO: digital output (0 dan 1), dapat langsung dihubungkan ke IO port microcontroller 4. A0: analog output, dapat membaca data sensor secara analog