Detect Light from Arduino

Wiring Light Blocking / Photo Interrupter Sensor

In this illustration we will going to wire the light interrupter. A photo interrupter is transmission type photo sensor that integrates optical receiving and transmitting elements in a single package please see the diagram below. Since the method involves light

Starter #9 Light Detection with (LDR) Light-Dependent Resistor with Arduino

Detecting a light or making a switch using Photoresistor interface with Arduino. Electronic Components Required Arduino UNO/MEGA/PRO 1x LED 1x 220k Ohm Resistor 1x 10k Resistor 1x LDR(Photo resistor)

/*
    .  .          ........ .... ..   ......      ........                       
MMMM   MMMMM    MMMMMMMMMMMMMMMMMMM MMMMMMMMMM. MMMMMMMMM                       
 MMM.MMMMMMM   MMM      MMM     .MM.MMM     MMM .........      .... ... .  . .  
MMM MMMMMMM . .MM.      MM.     MMM MM.  . MMM MMMMMMMMM       MMMM MMMMM.MM MM
MMMMMMMMMMMM. .MMM      MMM.  .MMM.MMMMMMMMM  ........    MMM MM  . M .MMMMMMMM.
MMM    .MMM     MMMMMMMM.MMMMMMM.  MM    .MMM. MMMMMMMM.  MMM .MMMM MMMM MMMMMM.
                                                           .   ...  . .  ......
*/

int photocellPin = 2;//define the LDR to D2;
int ledPin =12;
int val =0; //val to store the data;
void setup(){
pinMode(ledPin,OUTPUT);//set the ledPin to output;
Serial.begin(9600);
}
void loop(){
val = analogRead(photocellPin);
Serial.println("current light is");
Serial.println(val);
if (val<350){
//512 =2.5V, you can modify this to adjust the sensitivity;
digitalWrite(ledPin,HIGH);
}
else{
digitalWrite(ledPin,LOW);
}
delay(1000);
}

. . ........ .... .. ...... ........

MMMM MMMMM MMMMMMMMMMMMMMMMMMM MMMMMMMMMM. MMMMMMMMM

MMM.MMMMMMM MMM MMM .MM.MMM MMM ......... .... ... . . .

MMM MMMMMMM . .MM. MM. MMM MM. . MMM MMMMMMMMM MMMM MMMMM.MM MM

MMMMMMMMMMMM. .MMM MMM. .MMM.MMMMMMMMM ........ MMM MM . M .MMMMMMMM.

MMM .MMM MMMMMMMM.MMMMMMM. MM .MMM. MMMMMMMM. MMM .MMMM MMMM MMMMMM.

. ... . . ......

int photocellPin = 2;//define the LDR to D2;

int ledPin =12;

int val =0; //val to store the data;

void setup(){

pinMode(ledPin,OUTPUT);//set the ledPin to output;

Serial.begin(9600);

}

void loop(){

val = analogRead(photocellPin);

Serial.println("current light is");

Serial.println(val);

if (val<350){

//512 =2.5V, you can modify this to adjust the sensitivity;

digitalWrite(ledPin,HIGH);

}

else{

digitalWrite(ledPin,LOW);

}

delay(1000);

}

Download the source code here | 14Core Light Detection

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