Page 161 - Programming the Photon Getting Started With the Internet of Things

Schematic Reference Description Appendix

M1 Photon board M1

Breadboard H1

Jumper wires H2

R1 Photocell R4

R2 10-K resistor R3

Table 8.1 Hardware and Components

Now that we have our circuit built, we need to write our program to the Photon board
so we can read our variable using IFTTT. Here is the code for our experiment:

int photoresistor = A0;

int power = A5;

int analogvalue;

void setup() {

pinMode(photoresistor,INPUT);
pinMode(power,OUTPUT);

digitalWrite(power,HIGH);

Spark.variable("analogvalue", &analogvalue, INT);

}

void loop() {
analogvalue = analogRead(photoresistor);
}

The code for our experiment is really simple. We set pin A5 as an output, so we apply
a voltage through the circuit, then we read the value from the photoresistor and store the
value in a variable called analogvalue. Remember that the values we are reading from the