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valerionew / unisolder-notes

Markdown documentation repo for building and chosing parts for Unisolder, the open source universal soldering iron controller
Creative Commons Attribution 4.0 International
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Problems with calibration #18

Closed curieos closed 4 years ago

curieos commented 4 years ago

I'd post this to the forum, but I'm not getting the verification emails when I sign up, and no one has responded.

I'm trying to calibrate my unisolder. When I go into the calibration menu, the R value is sitting at 35 with the 10 ohm resistor attached. I can turn the trimmer and have it go up to 40, or down and it goes to 30. If I disconnect the resistor, the value shoots up to 1100-ish. Reading the docs, it is supposed to be close to 1000 with the 10 ohm resistor? I tried searching through the forums, but I didn't find anything that solved my issue. I found some things that mentioned the current across Sense A and Vout1- should be around 380uA, mine measures 360uA (though I don't fully trust my multimeter). I double checked U11 was soldered on properly, as well as the PIC, but I haven't been able to figure it out. I even replaced Rc2 thinking it was a broken pot (original spun infinitely).

nicola-d commented 4 years ago

I also had problems getting the verification email from the forum. After several tries I succeded though.

I don't remember much of the calibration procedure but I'm pretty sure it wasn't straightforward for me either. The values weren't the ones expected. I think I had to check and redo some solder joints to solve the problem...

curieos commented 4 years ago

I figured the problem out, for some reason two of the pins on U17 were shorted somehow. I was able to calibrate, but now I have a new issue. When I plug the iron in it says "Heater Open". I double checked the wiring and I'm pretty sure the connector is wired up correctly. I'll do some more searching on the forum.

curieos commented 4 years ago

When it said "Heater Open", the iron was correctly identified. I found a short on C17, resoldered it, and now it says "no instrument". I went into the calibration screen and the IDs are set to 5 and 5. I then found shorts on R2 and R21, fixed those, and the same issue is present. Not sure what is going on, I'll keep looking.

nicola-d commented 4 years ago

Maybe this is of some help:

http://dangerousprototypes.com/forum/index.php?topic=7218.msg68141#msg68141

curieos commented 4 years ago

The recommendation is to reprogram, but it looks like the problem was resolved by replacing the PIC... I'll do some more looking on the forum, maybe I'll find something where I don't have to replace the entire PIC and that will work...

curieos commented 4 years ago

I figured it out, turns out I did wire it incorrectly. Had heater channel two + and - flipped. Guess that's what I get for soldering while tired. That explains why it detected the iron before, C17 was shorting channel 2 + and - together...