my mb16 is now nearly ready but i’ve got a major problem. All pots seem to work ok. i’ve got 4 rows of 4. Nr1-8 all is fine! But 8-16 something is wrong. Values just go from 3- 125.
Now…when I turn the 2nd pot of the 3rd line (pot 10), the other pots of this line just go with it. I can turn the other pots of the 3rd and 4th row and they work fine. except when i turn the faulty pot to high, … then the other are in/decreasing with the amount the bad pot moves.
Also funnily enough, if the bad pot isnt set up too high, I can “adjust” the range the others can go. In example
badpot @ 100 ====> goodpots@97 or sth; all rest of pots in the line arent changeable anymore .
badpot @ 20 ====> goodpots adjustable from 5-127
badpot @ 15 ====> goodpots adjustable from 0-122
So when I let that bad pot @ about 15 all others work fine. (hmm… 8-16 just working in that smaller range like this example tells you)
I’ve already tested to plug another 4051 into my ain but that doesnt affect the problem. hope you can help me.
Power and ground rails cant be the prob i think. They go from up to down. (pot nrs: 1,5,9,13 2,6,10,15 3,7,11,15 4,8,12,16). Due pots 1-8 are working so I dont think it has sth do do with. Powercables are all soldered in the middle of the 4 stripe boards (right word???). Every part has been soldered, no coneectors. I cant find any bad soldering or bridges on my ain.
checked the connections between ain and core with a multimeter. all seems ok. no shorts. i’ve measured directly at the pins of the pics so I can be sure its ok.
It isn’t a configuration problem - it’s very likely that one of the connection is faulty.
You can easily measure the voltages at the outer pins of each pot, and you can measure the voltage between ground and the middle pin - these are the voltages which are converted by the internal ADC of the PIC. This should help you to locate the error
Changed cabled to the core so I used the 2nd multiplexer for pots 1-8. The pots and the ain are working fine. Just the problem the other pots are moving with it. lookin aggain at the ain for that. but no chance to get the 2nd ain of the 18f working. dont know why. ill check if i connect it to the third and ground the 2nd. then setting pots to 24 should work or not ?
You HAVE to take the 3rd analog input of J5. i see, because i see reverb 9 on lcd when pot 9 is turned. my theory was itll get 17 when taking the 3rd analog input on the core.
I think this should be added to the ain page for others who only want to take 16 pots. A total newb would never find I think.
hope ill find it soon