Page 171 - Programming the Photon Getting Started With the Internet of Things

}

First we need to define the pins that we are going to use on the Photon board. The
buzzer is connected to digital pin 1, and the vibration motor is connected to analog pin 4.

#define MOTORPIN A4
#define BUZZPIN D1

Next in the setup function we set both the buzzer and the motor to outputs and create
a Spark function that we can pass data though from IFTTT. Remember that the Spark
function name cannot be longer than 16 characters.

pinMode(MOTORPIN, OUTPUT);

pinMode(BUZZPIN, OUTPUT);
Spark.function("Twitter", twitter);

We ignore the loop function because when the Spark function is called, it initializes

the twitter function. The Spark function passes through a string value called command,
and we check to see if this value is equal to “buzz,” then write the motor and buzzer to
HIGH for one second before turning them off. If the function does not equal the value of

“buzz,” then the function returns −1 as failed.

int twitter(String command)

{
if (command == "buzz")
{

digitalWrite(MOTORPIN, HIGH);
digitalWrite(BUZZPIN, HIGH);
delay(1000);
digitalWrite(MOTORPIN, LOW);
digitalWrite(BUZZPIN, LOW);

return 1;
}
else return -1;

}

Now that we have our Photon set up and running, we can now turn our efforts to the
IFTTT Web service. Log in to your account and create a new recipe. This time we are

going to use Twitter as a trigger rather than the Photon as before. At this point you may be
prompted to authenticate your Twitter account and asked to give permission for IFTTT to
use the Twitter Web service. On the trigger page there are quite a number of different
types of triggers that you can choose from—the one we will use for this experiment is
“Twitter mentions of you.” Whenever your Twitter ID is tagged in a tweet, this will trigger

the events in the recipe. Select New Mention Of You and proceed to the next step. Here