IR SENSOR MODULE | Code | Circuit | Pin configuration | Circuit

IR SENSOR MODULE

IR sensor module is used to measure motor speed, obstacle detection, color detection.

The circuit formation of IR LED (IRtransmitter LED and IR Receiver LED) is known as IR sensor module.IR sensor module consists of IR LED, LM358 (comparator), Preset, LED light indicator.IR sensor module emits the Infrared light using this IR transmitting LED, the wavelength of IR light is 700nm-1nm.IR light wavelength invisible to the human eye so you can observe this light from the mobile camera. The range of IR light is from centimeters to feet that depend on the type of the IR sensor module.

For example short range IR sensor module, long-range IR sensor module.

 

IR-SENSOR-MODULE-PINOUT

Type : short range IR sensor module(up to 20cm).

 

Other names: Photo Diode, Optoelectronic component, IR-LED, IR-Transmitter, IR-           Receiver, IR-Pair, IR-Module, IR proximity sensor.

Other related devices

IR module, TSOP1738, HSDL-4260, SIR204C

 

 

 Pin configuration

1	Vcc	Battery positive pin
2	Data (D0)	Digital data output
3	Data (A0)	Analog data output
4	GND	Battery negative pin

 

Note: some IR sensor modules have only three pins Vcc, Gnd, D0.

 

  Features

• Digital and analog output signal
• Detection distance: 2 ~ 20cm
• Detection angle: 35 ° Degree
• Comparator chip: LM393/LM358
• Adjustable detection distance range via potentiometer/Preset:
• Clockwise: Increase detection distance
• Counter-clockwise: Reduce detection distance

 

Technical specifications

• Working voltage: 3 - 5V DC
• Distance: 2-20cm
• Output type: Digital switching output (0 and 1) and Analog output
• 3mm screw holes for easy mounting
• Board size: 3.2 x 1.4cm

 

How the IR Receiver LED | Photo Diode works

It is the Receiver part of the IR sensor module. IR Receiver LED operates in Reverse bias condition that means current flow will increase in reverse bias condition. When the light falls on the receiver part the IR Receiver will start conducting and current flow will increase, so the current flow will depend on the amount of light intensity that falls on the receiver part.IR receiver LED is coated with black color because of black color absorbs the high amount of light intensity.

 

Preset

Preset is used to adjust the sensitivity of the IR sensor module.

For example: By default, the sensor detects the obstacle in the range of 10cm only so if you  want to change (either increase or decrease) the obstacle detection range of the sensor you can vary the preset manually and fix it at a certain position.

Preset is used to vary the obstacle detection range of the IR sensor module.

 

Working of IR sensor module

In this circuit, the default (No IR light falls on the Receiver-No obstacle) the output is LOGIC-1 when IR Light falls on the receiver, the output will transition to LOGIC-0.

 

Default-No obstacle

IR-SENSOR-MODULE-CIRCUIT

When there is  no obstacle in front of  IR LED, No IR light falls on the Receiver

The output is LOGIC-1

Obstacle presence

IR-SENSOR-MODULE-CIRCUIT

Here obstacle is present in front of the IR sensor module then the IR light reflects and falls on the Receiver LED.

The output is LOGIC-0.

Note: The object should have white color, then you can get efficient output because  white-color is perfectly reflect the IR-signal (The object should have an IR signal reflecting nature)

Note : The output of the IR sensor module depends on the sensor module circuitry, by default it can give either Logic-0 or LOGIC-1, so you need to check using multimeter. Most of the IR sensor modules are work as discussed above.

 

Arduino with IR sensor

IR sensor module has four pins Vcc, Gnd, Digital output(D0),Analog output(A0).

IR sensor module

Vcc is connected to a 5V pin of Arduino

GND is connected to the GND pin of the Arduino

D0 pin is connected to any digital data pin (8) of Arduino

Buzzer

The buzzer has two pins positive terminal and negative terminal.

Note: buzzer is an interface with positive logic

The positive pin of the buzzer is connected to any digital pin of Arduino

The negative pin is connected to the GND of the Arduino

CIRCUIT

CIRCUIT WITH NO OBSTACLE 

ARDUINO-WITH-IR-SENSOR

CIRCUIT WITH OBSTACLE

ARDUINO-WITH-IR-SENSOR

 CODE

/***************************************************** # IR SENSOR MOULE Example sketch follow us: www.technoelectronics44.com ******************************************************/ #include<SoftwareSerial.h> int IR_sensor=8; int buzzer=9; int sensor_value; void setup() { Serial.begin(9600); Serial.print("WELCOME TO TECHNOELECTRONICS44"); pinMode(buzzer,OUTPUT); digitalWrite(buzzer,LOW); } void loop() { sensor_value=digitalRead(IR_sensor); if(sensor_value==LOW) { Serial.println("OBSTACLE DETECTED-BUZZER ON"); digitalWrite(buzzer,HIGH); } if(sensor_value==HIGH) { Serial.println("NO OBSTACLE-BUZZER OFF"); digitalWrite(buzzer,LOW); } }

 

 

OUTPUT WINDOW WITH NO-OBSTACLE

ARDUINO WITH IR OUTPUT WINDOW-NO OBSTACLE

Working principle

When there is no obstacle IR sensor module sends LOGIC-1 to Arduino, So Arduino identifies there is no obstacle. if there is any obstacle within  the range the IR sensor module sends LOGIC-0 to Arduino, then Arduino identifies there is an obstacle detected, and Arduinoturn ON the buzzer.

Note: when the buzzer is turned ON/OFF is completely depends on the Arduino program.

 

 OUTPUT WINDOW WITH OBSTACLE

ARDUINO WITH IR OUTPUT WINDOW-OBSTACLE

DATASHEET

APPLICATIONS

• Motor speed measurement
• Obstacle detection
• Contactless temperature measurement
• Counting machines
• Security systems because of IR signals are invisible to human eye
• Cameras

 

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