HD44780 LCD Display Timeout Error

Posted on Sat 3rd, October 2020

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• #26

user118421
Thank you - I can't find any 'Vin' pin? I moved the I2C board 'VCC' orange wire from the Pico 3.3 to VBAT as in picture but that did not change the result - still display is lit but no text.
Unfortunately I do not have an Arduiono to test on. I tried an original Espruino board and an ESP32 running Espruino but no luck there either..

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• #27

MaBe

Can you turn down the backlight via the blue poti?
• #28

user118421
That was it! Turning the blue poti on the I2C board made the text appear :)

So happy to have this working - many thanks to all for all your kind help!!

1 Attachment
• #29

Gordon

Great! Good call @MaBe :) I'll add a 'troubleshooting' section to that page with this stuff in
• #30

parasquid

Then I realized it was because I set the contrast too low.

I had the same issue with mine when I was first testing it some time ago :D I woild agree that this is a common "gotcha" and should be in the troubleshooting section :P

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