HW201 Infrared (IR) Sensor Module

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An IR (infrared) sensor is an electronic component that detects and measures the infrared radiation ( IR signals are not observable by the human eye) in its environment. When a human, object, or anything comes closer to the sensor, the IR from the LED reflects off of the object and is detected by the receiver.

Overview of HW201 Sensor

The HW201 comprises emitting and receiving tubes, transmitting tubes emitting certain infrared frequencies when it detects the obstacle, the sensor has the reception tube which receives that infrared frequency, Then there is a process of the comparator circuit. There is a green light that gets ON after that, The module also has a potentiometer through which one can adjust the detection distance.

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Working

TR Transmitter in the module emits Radiation. And, if the radiation gets reflected, the IR Receiver detects radiation and its resistance drops down, output goes low. If the radiation doesn’t get reflected, the Receiver doesn’t detect any Radiation, therefore its resistance rises, and output goes high.

Features and Specifications

Features

2 to 30cm adjustable sensing range (on-board Potentiometer)
35-degree Detection Angle
LM393 Comparator Selection Output
Easy to use
Please note that the sensor sensitivity varies depending on the reflection surface applied

Specifications

Main Chip: LM393
Detection Distance: 2~30cm
Detection Angle: 35 °
Working Voltage: 3.3V~5V
Board Size: 31 * 14mm / 1.22 * 0.55in
Board Weight(1pc): 3g
20mA supply current

Pinouts of HW201 Module

Pin Name	Description
VCC	Power Supply Input
GND	Power Supply Ground
OUT	Active High Output

Applications of IR Sensor

IR Imaging Devices

IR image devices are one of the primary applications of IR modules, primarily because of their property that is not visible. We used it for thermal imagers, etc.

Security Devices

Since the IR module works for infrared radiation, therefore, it may be utilized in some Security devices. The transmitter transmits, and the receiver receives the waves. When something comes between these waves, the receiver gives the signal forward to the circuit.