Obstacle Detector by IR Sensor & ATmega328 Arduino

We all have sure 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 obstacles 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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5$ PCB Prototype

Hardware Required

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

S.no	Component	Value	Qty
1.	IC	ATmega328p	1
2.	USB cable for uploading the code	–	1
3.	IR Sensor	–	1
4.	Buzzer and LED	–	1
5.	Resistor	220-ohm	1
7.	Jumper wires and a breadboard	–	1

Atmega328p Pinout

Obstacle Detector Circuit

Connection Table

Arduino UNO	IR Sensor
( +5V )	VCC
GND	GND
D2 Pin	OUT Pin
Arduino UNO	Buzzer
D7 Pin	Positive
GND	Negative
Arduino	LED R	220 Ohm Resistor
D6 Pin	Anode Pin
GND		Terminal 1
	Cathode Pin	Terminal 2

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  
 }  
 }