Arduino Uno

light sensor

Corner
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Light sensor

Schematics

light sensor schematics

Photo

light sensor

Sample code

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// the pin where the temperature is to be mesured
int lightPin = 5;

void setup()
{
// open te serial output with 115200 baud
Serial.begin(115200);
}

void loop()
{
// read the light
int lightReading = analogRead(lightPin);
// calculate the percentage
float percent = lightReading / 1024.0 * 100;
// round to two decimals
percent = floor(percent*100) / 100;
// print it on the serial output
Serial.println(percent);
// wait a second
delay(1000);
}