IR Sensor Module Infrared Obstacle Avoidance Sensor

KShs400

The IR sensor module consists mainly of the IR Transmitter and Receiver, Opamp, Variable Resistor (Trimmer pot), output LED in brief.

Out of stock

Description

The IR sensor module consists mainly of the IR Transmitter and Receiver, Opamp, Variable Resistor (Trimmer pot), output LED in brief.

IR LED emits light, in the range of Infrared frequency. IR light is invisible to us as its wavelength (700 nm – 1 mm) is much higher than the visible light range. The LED is white or transparent in colour, so it can give out amount of maximum light.

Photodiode acts as the IR receiver as its conducts when light falls on it. Photodiode is a semiconductor which has a P-N junction, operated in Reverse Bias, means it start conducting the current in reverse direction when Light falls on it, and the amount of current flow is proportional to the amount of Light. This property makes it useful for IR detection. Photodiode looks like a LED, with a black colour coating on its outer side, Black colour absorbs the highest amount of light.

LM358 is an Operational Amplifier (Op-Amp) is used as voltage comparator in the IR sensor. The comparator compares the threshold voltage set using the preset (pin2) and the photodiode’s series resistor  voltage (pin3).

Photodiode’s series resistor voltage drop > Threshold voltage = Opamp output is High

Photodiode’s series resistor voltage drop < Threshold voltage = Opamp output is Low

When Opamp’s output is high the LED at the Opamp output terminal turns ON (Indicating the detection of Object).

The variable resistor used here is a preset. It is used to calibrate the distance range  at which object should be detected.

IR Sensor Module Features

  • Operating voltage of 5 VDC
  • I/O pins are 5V and 3.3V compliant
  • Range: Up to 20 cm
  • Adjustable Sensing range
  • Built-in Ambient Light Sensor
  •  To add on, it has a supply current of 20mA
  • Lastly it has a mounting hole

Applications

  • Used for Obstacle Detection
  • Also used for Industrial safety devices
  • In addition to that, its used as a wheel encoder

Datasheet

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