how to get an analog potentiometer to settle down?

[towlerg]

or just round the output .

[keithv]

or just round the output .

How do I do that? Is there a command line that will round up or down?

[CuriousOne]

Yes, there is such command, but I don't remember it's name, check the manual, it was something like I=I<<I or whatever.

[HenrikOlsson]

If you DEFINE ADC_BITS 8 it will grab the 8 high bits of the 10bit result from the ADC, you'll leave the noise in the lower two bits but at one point or another you're still going to be on the edge where the 3rd bit is flipping back and forth and you're back at square one.

You can always take multiple samples and average them to smooth things out a bit.

/Henrik.

[Aussie Barry]

Try adding a bit of capacitance from the wiper of the pot to ground - say 100nF.
This should minimise some of the variations you are experiencing.

Cheers
Barry
VK2XBP

[Dave]

KeithV, You could always low pass filter the A/D reading if you are not requiring the responce speed. If you require the speed then just read the A/D faster. Something like this:

FILTG CON 32 'FILTER CONSTANT (255 = NO FILTER, 1 = MAXIMUM FILTER)

VOUT VAR WORD 'FILTER HISTORY

LOWPASS: '------------------- LOW PASS FILTER --------------------------
VOUT = VOUT - (VOUT */ FILTG) + A_D_READING
FILTERED_VOLTAGE = VOUT */ FILTG 'FINAL FILTERED OUTPUT COMPUTED
RETURN

I use something similar to it all the time....

[Art]

How do you have the 2.4955V in memory? Is that a word? Because that wouldn’t give you much range past 6 Volts.

You can keep the resolution and take the mean of the last n readings if you can calculate it, which you probably can.
The larger n is, the less responsive your potentiometer is, at least “apparently”,
but the smaller the fluctuation you see, the easier it is to pad out.

If you’re going to blow out a variable used to calculate the mean, you can add and divide small groups of variables
to arrive at a new smaller group of variables, and work down to one number that way.

Heart rate monitors at least used to do this because the interface to the body, and radio between the chest sensor and device was so clumsy.