Practical: 8
AIM: Interface IR sensor to Arduino.
(1) Write a program to detect obstacles using an IR sensor and display count of obstacles on
7-segment display.
#include <Arduino.h>
const int irSensorPin = 16; // Pin connected to IR sensor output
const int segPins[] = {5, 4, 0, 2, 14, 12, 13}; // Segment pins (A to G)
int obstacleCount=0;
// Segment encoding for digits 0-9
const byte digits[10][7] = {
{1, 1, 1, 1, 1, 1, 0}, // 0
{0, 1, 1, 0, 0, 0, 0}, // 1
{1, 1, 0, 1, 1, 0, 1}, // 2
{1, 1, 1, 1, 0, 0, 1}, // 3
{0, 1, 1, 0, 0, 1, 1}, // 4
{1, 0, 1, 1, 0, 1, 1}, // 5
{1, 0, 1, 1, 1, 1, 1}, // 6
{1, 1, 1, 0, 0, 0, 0}, // 7
{1, 1, 1, 1, 1, 1, 1}, // 8
{1, 1, 1, 1, 0, 1, 1} // 9
};
void setup() {
Serial.begin(115200);
pinMode(irSensorPin, INPUT);
for (int i = 0; i < 7; i++) {
pinMode(segPins[i], OUTPUT);
}
}
void displayDigit(int num) {
for (int i = 0; i < 7; i++) {
digitalWrite(segPins[i], digits[num][i] ? LOW : HIGH); // LOW turns on the segment
}
}
void loop() {
// Read the value from the IR sensor
int sensorValue = digitalRead(irSensorPin);
// Check if the sensor is detecting an obstacle
if (sensorValue == LOW) { // Assuming LOW means obstacle detected
Serial.println("No of Obstacle Detected");
obstacleCount++;
Serial.println(obstacleCount);
} else {
Serial.print("No of Obstacle Detected");
Serial.println(obstacleCount);
}
displayDigit(obstacleCount);
if(obstacleCount==9)
{
obstacleCount=0;
}
// Delay to avoid flooding the serial monitor
delay(1000); // Adjust the delay as needed
}
(2) Use two IR sensor and make a circuit for object counter / vehicle counter. Display count
on 7-segment display.
int inputPin = 13; // choose input pin (for Infrared sensor)
int val = 0; // variable for reading the pin status
int count = 0;
void setup()
{
Serial.begin(9600);
pinMode(inputPin, INPUT); // declare Infrared sensor as input
}
void loop()
{
int val = digitalRead(inputPin); // read input value
if (val == HIGH)
{
Serial.println("obstacle not detected");
}
else
{
Serial.print("obstacle detected:");
Serial.println(count);
count = count + 1;
if (count == 10)
{
count = 0;
}
}
delay(500);
