ANALOG LIGHT INTENSITY SENSOR

INTRODUCTION

 The Light Dependent Resistor (LDR) is suitable for use in academic projects which requires a device or circuit to be automatically switched ON or OFF in darkness or light. As the amount of light falls on this LDR increases its resistance or decreases. The light detector itself is just in 5mm diameter.

FEATURES

• Wide spectral response.
• Low cost.
• Analog output more accurate.
• High quality PCB FR4 Grade with FPT Certified

ARDUINO CODE

/*
Analog input, analog output, serial output

Reads an analog input pin, maps the result to a range from 0 to 255
and uses the result to set the pulsewidth modulation (PWM) of an output pin.
Also prints the results to the serial monitor.

The circuit:
* potentiometer connected to analog pin 0.
Center pin of the potentiometer goes to the analog pin.
side pins of the potentiometer go to +5V and ground
* LED connected from digital pin 9 to ground

*/

const int analogInPin = A0;      // Analog input pin that the potentiometer is attached to
const int analogOutPin = 9;     // Analog output pin that the LED is attached to

int sensorValue = 0;                // value read from the pot
int outputValue = 0;                // value output to the PWM (analog out)

void setup() {
// initialize serial communications at 9600 bps:
Serial.begin(9600);
}

void loop()

 {
// read the analog in value:
sensorValue = analogRead(analogInPin);
// map it to the range of the analog out:
outputValue = map(sensorValue, 0, 1023, 0, 255);
// change the analog out value:
analogWrite(analogOutPin, outputValue);

// print the results to the serial monitor:
Serial.print("sensor = " );
Serial.print(sensorValue);
Serial.print("\t output = ");
Serial.println(outputValue);

// wait 2 milliseconds before the next loop
// for the analog-to-digital converter to settle
// after the last reading:
delay(2);
}

PIC CODE

http://researchdesignlab.com/analog-light-pic-code.html