I got the following IC2 digipot 1882 and already found a few related posts with this IC. However, none of these are related to the correct wiring of this chip, which seems to be my error...
It seems that I missed something concerning the correct wiring of digipot. Here (Imgur) you can find a sketch of my prototype as well as the example circuit from the datasheet. I already figured out, that 2 resistors are 1 too much for the SCL and SDA line.
However, I don't think it is related to my problem since I am able to find the I2C display and control it without any trouble.
Furthermore to check that the pot works, I simply wired it up directly (no resistors or anything else) to an arduino without my prototype pcb board as followed:
VDD & VCC to 5V Arduino Pin
GND, A0, A1, A2 and !CE to GND Arduino Pin
As well as SCL and SDA of cause.
aaaaaand: it works... The chip will get found by the scanner. However I am nor sure why. And it gets worse (at least more confusing for me) since when I am hooking the chip up manually to the working SDA SCL pins used for the display (upper left corner) and VDD & VCC to my 5V + Line (red line at the bottom %V) and GND, A0, A1, A2 and !CE to the GND line at the bottom, it also won't work (won't be regocnized by an IC2 scanner). So there can't be anything wrong with the connection but more or less something with my circuit.
I tried everything for the last 8h and it won't work. Running out on ideas! Every input or idea is highly appreciated!
Posting a schematic, not a frizzy thing as how you wired it would be a big help. Also you post a link to the nice looking pictures which do not help. What have you done with the CE\ pin if it ain't ground it ain't gonna work properly! Open it is sometimes maybe it might work and then again it might not work.
Thanks for the input. I hoped someone could provide me with a functioning schematic but sure, I also can make a real schematic.
CE/ is definitely tied to ground. As described, what's the most confusing to me, that it work if I manually connect it to the arduino but won't if I connect it to my circuit the same way the display is connected (and again, the display works....).
I thought there might be some error with the VDD and VCC being in the same circuit...?
I think I found the problem... when I remove the pull ups from the circuit it works...
I was using 10k resistors (didn't had any 4,7k lying around)
However if I remove them the device gets regocnized, unfortunately as soon as I connect my display with the IIC Inerface, I only shows up the display and ignores the IC once again.... I am really out of ideas. Would 4,7 k resistors help?
