Introduction: IR-Distance Sensor Homemade Tutorial

this instrument can detect precisely any object from a distance of 40 cm to 0.5 cm.
and this can actually calculate the distance of the object .
Here i will use this feature to analogWrite the LED.  which will incerease its brightness as the distance gets lesser ...

Step 1: The Circuit

You Can Build this with these Materials :-

-Arduino (Uno)
-Jumper Wires
-LED(Indicator ,any colour)
-IR LED Pair

You should follow The Schematict to make your own sensor then you may follow ahead ........

Step 2: Coding and Caliberating the Sensor

the code is as follows :-

when there is no object is in front of it then my serial monitor reads 168..

so only if the value is above 170 then the sensor will read the value hence the bolded number is a bit more than your normal sensor value .......

The minvalue is the variable used for that purpose ...!


int led = 9 ;

int minValue = 170;

void setup() {

void loop() {
int sensorValue = analogRead(A5);
if (sensorValue > minValue){

int val = map(sensorValue, minValue, 980 , 0, 255);


else {


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