Obstacle Detector by IR Sensor & ATmega328 Arduino

We all have surely observed that our phone display turns off during phone calls when we put it near our ears. So, do you ever wonder how does this happen???

It is not a hi-tech thing but a simple IR sensor to detect the obstacle near the phone we are also making the same project in this article, we are going to make an "Obstacle Detector" with an Infrared IR Sensor and ATmega328p Chip. This commonly used IR Sensor can also be used as Line Follower Robot we will discuss that later. Let's start making it a simple Obstacle Detector.

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Hardware Required

You will require the following hardware to make this obstacle detector.

Atmega328p Pinout

Obstacle Detector Circuit

Connection Table

Working Explanation

As the code in the setup section, we define the pin along with the type to which the sensor is connected and also initialize the pin and type for the led and buzzer.

In the loop section, we read the digital value on pin 2 of the microcontroller and according to the value, we apply conditions either 1 or 0 to turn the led and buzzer on or off. In the analog code in the loop section, we read the analog value i.e., 0-1023 values on pin A0 and according to the value of 200 or more, we turn the led and buzzer on or off.

Atmega328p Code

 int val = 0 ;  
 void setup()  
 {  
 Serial.begin(9600); // sensor buart rate  
 pinMode(2,INPUT);  // IR sensor output pin connected  
 pinMode(6,OUTPUT);  // LED  
 pinMode(7,OUTPUT);  // BUZZER  
 }  
 void loop()  
 {  
 val = digitalRead(2);  //  IR sensor output pin connected  
 Serial.println(val);  // see the value in serial monitor in Arduino IDE  
 delay(500);  
 if(val == 1 )  
 {  
 digitalWrite(6,HIGH);  // LED ON  
 digitalWrite(7,HIGH);  // BUZZER ON  
 }  
 else  
 {  
 digitalWrite(6,LOW);  // LED OFF  
 digitalWrite(7,LOW);  // BUZZER OFF  
 }  
 }  

Applications

• To detect the presence of objects nearby
• Security Alarm
• Smart Gadgets