Build a Simple Obstacle Sensor with Arduino – Easy IR LED & Photodiode Tutorial

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Arduino IDE

About this project

Step 1: Gather Stuff

Stuff you are gonna need:

• Arduino

• 150 ohms resistor

• 3k ohms resistor

• IR LED

• Photodiode

• jumpers

• breadboard

• LEDs

Step 2: Assemble

• IR LED Anode => 150 ohms resistor => 5v

• IR Cathode => GND

• PhotoDiode Anode => GND

• PhotoDiode Cathode => 3k ohms resistor => D2

• PhotoDiode Cathode => A0

• Green LED => D13

• Red LED => D12

Step 3 Upload The Code:

Upload the code given. See my other projects:

Thank You!

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Code

• Code

CodeArduino

int photoDiode=2;                      
int GreenLed=13;                     
int senRead=0;                  
int SenseRate=905;                   
 void setup()    
 {  
  pinMode(photoDiode,OUTPUT);  
  pinMode(GreenLed,OUTPUT);
  pinMode(12,OUTPUT);
  digitalWrite(photoDiode,HIGH);       
  digitalWrite(GreenLed,LOW);      
  Serial.begin(9600);           
 }  
 void loop()  
 {  
  int val=analogRead(senRead);    
  Serial.println(val);            
  if(val <= SenseRate)               
  {
   digitalWrite(12,HIGH);  
   digitalWrite(GreenLed,LOW);       
   delay(20);  
  }  
  else if(val > SenseRate)            
  {  
   digitalWrite(12,LOW);
   digitalWrite(GreenLed,HIGH);       
   delay(20);  
  }  
 }  

Schematics