At 09:33 PM 7/26/2003 -0400, you wrote:
>Here's the setup: PIC16F872's ADC pin, PORTA pin 0, connected to a 1 Meg
>Ohm pot. Four LEDs provide output.
>
>Here's the requirement: use the pot to select one of 16 values, 0 to 15
>with the output being the 4 leds...a 4 digit binary number. All i do is
>shift the 8 most significant bits (from the ADRESH, left aligned so 8 most
>sig are in adresh with the two least sig in ADRESL) right four times so i
>keep the four most significant digits which i directly output to the LEDs.
>
>Here's the problem: when the pot is directly between two numbers, and left
>untouched, the pic will flicker between the two values because the pot i
>suppose doesn't give a steady output. This isn't allowed. I've tried
>adding a "debounce" where i wait to see if a value is held for 10 or 20
>times before switching the display, but all it seems to do is slow the
>flicker down. Any experience or suggestions? Thanks everyone... you have
>no idea how much this community has helped me.

Switch the pot for a lower value one (40K maximum, so maybe a 20K pot).

10K is the maximum input impedance.

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

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