// constants won't change. Used here to set a pin number:
const int buttonPin = 3;//the number of the pushbutton pin
const int ldrPin = A2;//the number of LDR pin
const int ledPingreen = 8;// the number of the greenLED pin
const int ledPinred = 7;// the number of the redLED pin

// Variables will change:
int ledState = LOW; // ledState used to set the LED

int buttonState = 0;
int sensorValue = 0; // variable to store the value coming from the sensor

int value = 0;

void setup()
{
// put your setup code here, to run once:
// set the digital pin as output:
pinMode(ledPingreen, OUTPUT);
pinMode(ledPinred, OUTPUT);

// set the digital pin as input:
pinMode(buttonPin, INPUT);
pinMode(ldrPin, INPUT);

}

void loop()
{
// read the state of the pushbutton value:
buttonState = digitalRead(buttonPin);

// check if the pushbutton is pressed. If it is, the buttonState is HIGH:
if (buttonState == HIGH)
{
// read the value from the sensor:
sensorValue = analogRead(ldrPin);
value = map(sensorValue,0,1023,0,100);
if ( value>50)
{
// put your main code here, to run repeatedly:
digitalWrite(ledPingreen, HIGH); // turn the LED on (HIGH is the voltage level)
digitalWrite(ledPinred, LOW); // turn the LED on (HIGH is the voltage level)
delay(1000);
}
else
{
// put your main code here, to run repeatedly:
digitalWrite(ledPingreen, LOW); // turn the LED on (HIGH is the voltage level)
digitalWrite(ledPinred, HIGH); // turn the LED on (HIGH is the voltage level)
delay(1000);
}
}
else
{
digitalWrite(ledPingreen, LOW); // turn the LED off by making the voltage LOW
digitalWrite(ledPinred, LOW); // turn the LED off by making the voltage LOW
}
// wait for a second

}