Hygro Petal => Useful Sensor Code

hygro3.pde

// __________________ FUNCTION DECLARATIONS _________________________________
void led_on();
void led_off();
void readDataOnce();
char * readSensors();

messengerCallbackFunction messengerCallbacks[] = 
{
  led_on,	       // 004
  led_off,             // 005
  readDataOnce,	       // 006
  NULL
};

// __________________ PROGRAM CONSTANTS _____________________________________
const int power    = A2;
const int moisture = A5;
const int light    = A4;
const int temp     = A6;


// __________________ C A L L B A C K  M E T H O D S __________________________

// command 4
void led_on()
{
   digitalWrite(5, HIGH);
   cmdMessenger.sendCmd(kACK, "LED should be on");
}

// command 5
void led_off()
{
   digitalWrite(5, LOW);
   cmdMessenger.sendCmd(kACK, "LED should be off");
}

// command 6
void readDataOnce() {
   cmdMessenger.sendCmd(kACK, readSensors());
}

char *readSensors() {
   digitalWrite(power, LOW);  // on
   delay(500);

   static char data[15];
   char val[4];

   // read light
   itoa(analogRead(light), data, 10);

   // read moisture
   itoa(analogRead(moisture), val, 10);
   strcat(data, ",");
   strcat(data, val);

   // read temp
   itoa(analogRead(temp), val, 10);
   strcat(data, ",");
   strcat(data, val);

   // turn off power to save power; avoid heating, corrosion
   digitalWrite(power, HIGH);  // off

   return data;
}