How to programme LDR sensor
#include<SoftwareSerial.h>
int ldrpin = A0;
int ldrvalue = 0;
int led = 13;
void setup() {
Serial.begin(9600);
pinMode(led, OUTPUT);
}
void loop() {
ldrvalue = analogRead(ldrpin);
delay(1000);
Serial.println(ldrvalue);
if(ldrvalue <800)
{
digitalWrite(led,HIGH);
}
else
{
digitalWrite(led,LOW);
}
//delay(800);
}