IR sensors allow you to sense motion, almost always used to detect whether a human has moved in or out of the sensors range. They are small, inexpensive, low-power, easy to use and don’t wear out.
Passive infrared sensor (PIR) Motion Sensor Detector Module HC-SR501
OVERVIEW
- Infrared Sensor with Control Circuit Board
- The Sensitivity and Holding Time Can be Adjusted
- Wide Working Voltage Range: DC 4.5V- 20V
- Current Drain: <60uA
- Detection Angle: <140°
- Detection Distance: 3 to 7m
- Blockade time: 2.5s
- Work temperature: -20-+80°C
- Dimension: 3.2cm x 2.4cm x 1.8cm (Approx)
- Weight: 6g