Steam Machine Kill Switch (Simple Version)

steam-machine-kill-switch1.cpp

/**
 * Steam Machine Kill Switch (Simple Version)
 * Brett Walach
 * 2019-02-24
 *
 * A0 is wired directly to the gate of a 2N7002 mosfet
 * The source of the 2N7002 is connected to GND
 * The drain of the 2N7002 is connected to the Steam Machine's power switch
 * Computer GND is connected the Xenon's GND
 * Computer +5V from a USB port is connected to the Xenon's Li+
 */

#include "Particle.h"

bool isPowerOff = false;

int powerOff(String cmd) {
    isPowerOff = true;
    return 0;
}

void setup() {
    pinMode(A0, OUTPUT);
    Particle.function("poweroff", powerOff);
}

void loop() {
    if (isPowerOff) {
        digitalWriteFast(A0, HIGH);
        delay(500);
        digitalWriteFast(A0, LOW);
        isPowerOff = false;
    }
}