output's on as power is supplied

[mister_e]

Never trust a PIC at boot, it's output level is hard to predict. you should set it yourself at the top of your code and add a little delay

    PORTA = 0
    PORTB = 0    
    trisa = %00010000
    trisb = %00000000
    PAUSE 50 ' settle time 

loop:

It's not a bad idea to enable the Power Up timer in your Configuration fuses as well.

@       __CONFIG _XT_OSC & _PWRTE_ON & _WDT_OFF & _CP_OFF

http://www.picbasic.co.uk/forum/showthread.php?t=543

[Darrel Taylor]

It's not a bad idea to enable the Power Up timer in your Configuration fuses as well.

@       __CONFIG _XT_OSC & _PWRTE_ON & _WDT_OFF & _CP_OFF

I've never really had problems with outputs coming on at power-up. They always seem to be in INPUT mode.

But assuming you did need to set them manually, wouldn't the Power-ON timer just make it that much longer till they actually got set to output.

Just a thought.
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[mister_e]

If the hardware don't care about the 'Tri-State' or 'High impedance' level, yes...about 72mSec longer.

Unfortunately there's no Brown-Out detect on this one, we have no schematic and we can't measure the PSU behaviours and rise time from where we are.. hard to have the ultimate solution.

Maybe i misunderstood the original problem...

I now have everything working momentary now but at times when I apply power some if not all relays activate.

[Darrel Taylor]

If the hardware don't care about the 'Tri-State' or 'High impedance' level ....

Right, and that could be a problem.

Here's an idea for Taz.
Try running this program ...

STOP

Yes, that's the whole program.

It'll leave the pins in Hi-Z mode.

Then see if any relays come on?
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