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I say, remove the LED out of the code.

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I know Charlie, but what happens when the switch is tripped above the audience if there is suddenly a radio interference.
An emergency switch must be mechanically and should never be written in software.
Software can not be sure enough to switch and operate the hardware for continue working.
Hardware must disable by hardware with a real switch, a shut-off switch.

I agree with you.

if(GPIObits.GP4 == 0){   // If kill switch is on (grounded)
        if(KillSwitch < 10){ // Less than debounce value
            KillSwitch++;    // Increment value
            if(KillSwitch == 10){   // Debounce value reached
                INTCONbits.GIE = 0; // Disable interrupts
                sGPIO.GP1 = 1;      // Make sure HV trigger is off (turn GP1 on)
                GPIO = sGPIO.ALL;   // Update GPIO
            }
        }
    }
else if(KillSwitch > 0){ // Kill switch off (high)
        KillSwitch;       // Decrease counter
if(KillSwitch == 0){INTCONbits.GIE = 1;} // If debounced back to 0, enable interrupts
}

I agree that we need both a hardware and software kill feature. I for one want software kill.
John:
Are you talking about R8 on the schematic?

Jake:
 I was looking at the schematic and thinking about what you said about the LED turning on when you touch the back of the board. In this case you are introducing stray voltage from your fingers and it is high enough to turn the transistor on. I suggest that instead of using a resistor to limit current between the PIC and the base of the transistor, switch the resistor to a small signal diode and place the diode as close the ‘base’ as possible. The diode will help to ensure that a signal of at least .4v to 1v only gets through to the base. (.4 – 1v) depending on the diode you use (Schottky or Standard).
BAT42, 43, 85, 113 or 1N4148,1N914 my favorite.

For the other circuit I use a zener or diode and a resistor for filtering and to make sure the sgnal is at the level I want.
 
The ceramic decoupling capacitor between signal and ground is extra filtering or better yet use an electrolytic cap between the diode and the 'Base' then it will filter and keep the LED turned on a little longer. If you use one of the circuits the ‘on’ time of the LED may need to be increased slightly. Try the first circuit first it should be sufficient. I’ll show the files as soon as I figure out how to upload pics and PDFs.




Ray
 

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ORIGINAL: nyemi
WPU  0Bit  Why is the value 1?
The output is defined.(GP0-Pin 7)