A pocket sized intruder alarm using the HC-SR501 low cost PIR sensor.

Step 1: Items Needed

1. 01 x HC-SR501 PIR sensor

2. 01 x circuit board

3. 01 x male USB-A port

4. 01 x LED

5. 01 x buzzer

6. 01 x 2.54mm 03 pins female socket

7. Jumper wires

Step 2: Wire the Connections

Wire the connections according to their polarity; positive to positive and GND to GND.

Solder the connections.

Plug in a powerbank and it will work. The sensitivity can be adjusted by the trimpots on the sensor board.