i've been using MPLAB v8.92 and PIC18F452 with all 8 A/D channels enabled.
I get somewhat useful data but when one channel change a portion of the change end up in the other channels, both in the result i read out of the micro and on multimeters on the pins.
I have tried delaying the start of the conversion and setting the A/D channel using a hex switch similar to this one:
https://uk.farnell.com/apem/pt65-103/sw ... x%20switch
that way i read just one channel until i change the hex swich but still the channels get some level of mixing, up to about 5%
Any ideas of how to get around the problem?