HC-SR501 adjustable infrared motion sensor

The HC-SR501 infrared motion sensor module can detect the movements of a person or animal at a distance of up to 7 meters. This module is often used in simple security systems or household projects (automatically turn on lights when moving, automate electrical appliances, etc.)

The module board is designed based on the BISS0001 control chip. The chip receives radiation from the sensor and processes the received information to convert it into an analog or digital signal.

The HC-SR501 has two modes of operation (H, L). A jumper is used to change the modes, which is located on the back of the module. In H mode, the module output pulse disappears if there is no movement in the zone for a given time. If you connect the L mode, a logic signal appears at the output when the module is triggered.

There are also 2 potentiometers on the board. Using the SX potentiometer, the sensor sensitivity distance is changed (3 - 7 m), respectively, the trimming resistor TX sets the time during which a logical unit will be transmitted when moving in the sensor zone (5 - 300 s).

The infrared sensor has 3 pins for connecting to the Arduino microprocessor. The VCC and GND outputs supply voltage to the board, and the OUT pin is required to transmit a signal from the sensor to the device's microcontroller.

The voltage supply to the module is carried out from an external power source, an Arduino board or another microcontroller device.

Module Specifications:

Supply voltage, V 4.5 ... 20
Maximum current consumption, mA 60
Output voltage, V 3.3
Detection distance, m 3 ... 7
Detection angle, ° 145
Delay time, s 5 ... 300
Operating temperature, °C -20 ... +80
Module dimensions, mm 3.2 cm x 2.4 cm x 1.8

Scheme for connecting the module to Arduino Uno: