Datasheet

Use It!

Sensor test

We'll now test the sensors, using this sketch which is a bit of a mashup of the two examples

in our tutorials (http://adafru.it/c7d)

/* Sensor test sketch

for more information see http://www.ladyada.net/make/logshield/lighttemp.html

#define aref_voltage 3.3 // we tie 3.3V to ARef and measure it with a multimeter!

int photocellPin = 0; // the cell and 10K pulldown are connected to a0

int photocellReading; // the analog reading from the analog resistor divider

//TMP36 Pin Variables

int tempPin = 1; //the analog pin the TMP36's Vout (sense) pin is connected to

//the resolution is 10 mV / degree centigrade with a

//500 mV offset to allow for negative temperatures

int tempReading; // the analog reading from the sensor

void setup(void) {

// We'll send debugging information via the Serial monitor

Serial.begin(9600);

// If you want to set the aref to something other than 5v

analogReference(EXTERNAL);

}

void loop(void) {

photocellReading = analogRead(photocellPin);

Serial.print("Light reading = ");

Serial.print(photocellReading); // the raw analog reading

// We'll have a few threshholds, qualitatively determined

if (photocellReading < 10) {

Serial.println(" - Dark");

} else if (photocellReading < 200) {

Serial.println(" - Dim");

} else if (photocellReading < 500) {

Serial.println(" - Light");

} else if (photocellReading < 800) {

Serial.println(" - Bright");