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JackH
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· 02/11/2020 1:10 PM
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· 02/11/2020 9:35 AM
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snwcmpr
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· 02/10/2020 10:25 AM
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rogguy
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· 02/06/2020 7:24 AM
Searched but no can find, but does anyone on here use the roasters made by CRC (Coffee Roasters Club) in Connecticut?

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· 02/05/2020 2:50 PM
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TC4/Artisan showing "-1"
jessep
Ok, I tried a few things and ultimately "fixed" the problem.

The LCD is causing the instability, when I unplugged it everything was fine and I did three roasts in a row with zero issues. I didn't recompile the code without the LCD or anything. In the end I guess I don't mind not using an LCD, but now I'm wondering why it's in an issue.

Spent the day working on Mark 2!

i.ibb.co/tXTGF5n/IMG-20200119-202845.jpg
i.ibb.co/xqgYCk5/IMG-20200118-110605.jpg
 
mg512
Ahhh, that actually makes sense. The LCD would be connected to the same I2C bus as the ADC and other chips, so if the LCD was somehow defective in a way that affected the I2C bus, all those chips wouldn't be able to communicate with the Arduino either. You could probably replace the LCD (and I2C board and cables!) and you should be fine, I would imagine it's a hardware defect somewhere in the LCD.
 
https://www.tindie.com/products/15798/
greencardigan
Did you get the LCD from me? Let me know if you need a refund.
 
jessep
Well that could explain it!

Do you think I could have damaged the LCD when I plugged 5v into the ground?

Greencardigan, I did but don't worry about it. It was years ago and worked fine for a long time.

One thing that makes me wonder. I bought a cheap I2C OLED display that I was going to try and modify the program to use, but never got it to work. However, when it was plugged in, I'd get random drops in temperature values for one or two data points. Perhaps that's related?
 
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