> One of the problems with the TI ADC implementation is that it's slow 
> to
> update.
> First you always seem to get an old (queued?) value. So throw away 
> the first
> couple of readings after changing the input!
>
> Furthermore I suggest that you use J8 (the one close to the reset
> button) for the
> extruder reading as this channel seems to have the least
> crosstalk/disturbance
> caused by the  touch-screen interface.

so, result after 5 times potmeter on J8, J7 and J6 jumpers:
linuxcnc@arm:~$ cat `find /sys/devices/ -name in_voltage[456]_raw`
1196
3497
3003

switched the potmeter to J7, J8 and J6 jumpers:
linuxcnc@arm:~$ cat `find /sys/devices/ -name in_voltage[456]_raw`
1159
0
979

now potmeter on J6, J7 and J8 jumpers
linuxcnc@arm:~$ cat `find /sys/devices/ -name in_voltage[456]_raw`
1142
0
886


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