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TinkerKit LDR Sensor

TinkerKit LDR Sensor

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A2-0130

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TinkerKit LDR Sensor

LDR (or Light Dependant Resistor, or Photoresistor) is a variable resistor. Light falling on the sensor decreases its resistance.

Output: This module outputs 5v when the sensor receives no light (the circuit is open) and 0v when exposed to bright light (the circuit is closed). When connected to an input on the Arduino using the TinkerKit Shield, you can expect to read values from 0 to 1023.

Module Description: This module features a Light Dependent Resistor, a signal amplifier, the standard TinkerKit 3pin connector, a green LED that signals that the module is correctly powered and a yellow LED whose brightness changes according to the amount of lightness.

This module is a SENSOR. The connector is an OUTPUTwhich must be connected to one of the INPUT connectors on the TinkerKit Shield.

Code Example

/*
  Analog input, analog output, serial output

 Reads an analog input pin, and T000090 LDR Analog Sensor connected to I0, maps the result to a range from 0 to 255
 and uses the result to set the pulsewidth modulation (PWM) on a T010111 LED Module connected on O0.
 Also prints the results to the serial monitor.

 created 29 Dec. 2008
 Modified 4 Sep 2010
 by Tom Igoe
 modified 7 dec 2010
 by Davide Gomba 

 This example code is in the public domain.

 */


 #define O0 11
 #define O1 10
 #define O2 9
 #define O3 6
 #define O4 5
 #define O5 3
 #define I0 A0
 #define I1 A1
 #define I2 A2
 #define I3 A3
 #define I4 A4
 #define I5 A5

// These constants won't change.  They're used to give names
// to the pins used:
const int analogInPin = I0;  // Analog input pin that the LDR is attached to
const int analogOutPin= O0; // 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 10 milliseconds before the next loop
  // for the analog-to-digital converter to settle
  // after the last reading:
  delay(10);                     
}

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