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vitotai / BrewPiLess

Use an ESP8266 to replace RPI and Arduino. Running BrewPi without Pi, therefore, BrewPi-Less
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LCD Issue #110

Closed dotps1 closed 6 years ago

dotps1 commented 6 years ago

Last night my LCD went all crazy, i had to turn the unit off and back on. Not sure what i can do to give more info on it. img_0244

vitotai commented 6 years ago

It might be EMI or bad connection. There is a LCD refresh action every 10 minutes. If it were EMI, that refresh should fix it.

dotps1 commented 6 years ago

yeah im not sure, it seems to run fine for a day or two, but then does it again. i let it sit for atleast an hour after i noticed it again, and never refreshed.

anibalbenedetto commented 6 years ago

Hello Thomas, its seems to be electric noise. You can try changing the power supply.

I had a similar issue with other proyect and i solve it adding a tantalum capacitor to de power line in the display.

Anibal

El vie., 31 ago. 2018 a las 8:57, Thomas Malkewitz (< notifications@github.com>) escribió:

yeah im not sure, it seems to run fine for a day or two, but then does it again. i let it sit for atleast an hour after i noticed it again, and never refreshed.

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dotps1 commented 6 years ago

i cannot do it very easily, i have everything running off an inline AC>DC 5v converter. You can probably see it in the pictures here: https://www.thingiverse.com/thing:3042974 But its a 5v display running off a 5v power supply, so i'm not sure where the noise would be coming from.

quantum8 commented 6 years ago

It's kind of hard to see form the photos, but how close are the wires from the LCD to your relays (both power and switching side)? That will be a source of noise if not segregated enough. Also, what sort of power supply are you using? Some supplies can be quite noisy. Have you measured the ripple when the load on it changes?

dotps1 commented 6 years ago

its on the far side of the box from the actual plug into the LCD. Its strange it will usually work for a few days before it goes wonky like this. I have not measured the ripple when the load changes, i am kinda new to making my own stuff like this so i'm not sure even how to do that. Also, is there a way i could shield it?

quantum8 commented 6 years ago

Just make sure the wire from the LCD is completely clear of the relays, as well as the wires coming from the relay. You could try shielding; you'd need to replace the wires from the wemos to the LCD with a screened multicore cable. Make sure the shield is only connected to ground at one end otherwise you'll induce more noise instead. This is probably overkill here though.

You'll only be able to measure ripple if you have a oscilloscope and happen to catch it happening as it seems to be transient. Is there something nearby that is causing it to screw up? A microwave, amplifier or something nearby? It could even be your fridge causing interference.

As anibalbenedetto suggested, you could try a capacitor on the output of the power supply. A basic summary on the workings of this is here: https://electronics.stackexchange.com/questions/21686/whats-the-purpose-of-two-capacitors-in-parallel

dotps1 commented 6 years ago

So, I guess Im going to go ahead and close this. I'm about 9 days into a brew, and have even been using a profile ramping up the temp over the past 3 days, and this has not occurred. And with the ramp up, its defiantly turning on and off more. Anyway, I can't explain it, and I haven't changed anything.