Using Particle for Raspberry Pi to create a local and remote temperature warning.

particlepi-tempwarning.ino

// Define variables
Process proc;
float cpuTemp;
long lastExecution;

void setup() {
    // Initialise variables
    cpuTemp = 0;
    lastExecution = 0;
}

void loop() {
    // Measure the CPU temperature
    proc = Process::run("cat /sys/class/thermal/thermal_zone0/temp");
    proc.wait();
    
    // Parse command response
    cpuTemp = proc.out().parseFloat();
    
    // If higher than 60'C
    if(cpuTemp > 60000) {
        // Blink LEDs
        blink();
        // Only trigger notification every 10 minutes
        if(millis() - lastExecution > 10*60*1000) {
            // Publish temperature, triggering IFTTT applet
            Particle.publish("cpu_temp", String(int(cpuTemp/1000)));
            lastExecution = millis();
        }
    }
}

void blink() {
    // Set Blinkt to RED for 500ms
    proc = Process::run("/home/pi/Pimoroni/blinkt/examples/rgb.py 255 0 0");
    proc.wait();
    delay(500);
    
    // Set Blinkt to OFF for 500ms
    proc = Process::run("/home/pi/Pimoroni/blinkt/examples/rgb.py 0 0 0");
    proc.wait();
    delay(500);    
}