Arduino with Photoresistor sensor
A photoresistor or light-dependent resistor (LDR) or photocell is a light-controlled variable resistor. The photoresistor is not to differentiate Anode and Cathode. symbol of photoresistor How do I attach an photoresistor to the board? The following schematic shows the basic circuit. If you pick the resistors correctly, you can make the output of this circuit vary between a little over zero and a little under five volts for your range of light intensity. To pick the resistor, you need to realize that this circuit is just a generalization of the basic building block of analog electronics, the voltage divider. int photoRsPin = 0; int photoRsVal = 0; int minValLight = 100; int LEDPin = 13; int LEDState = 0; void setup(){ pinMode(13, OUTPUT); Serial.begin(9600); } void loop(){ photoRsVal = analogRead(photoRsPin); Serial.println(photoRsVal); if (photoRsVal < minValLight && LEDState == 0){ digitalWrite(LEDPin, H
