SSD1306 OLED (72x40) I2C display from scratch

[rsocor01]

Use a logical analyzer to see if the module responds to "Initializing command set" when it fails. If it doesn't respond you can try a longer pause "PAUSE 500 ' let display settle".

Check that you don't have any noise in the power lines or control lines.

[flotulopex]

Use a logical analyzer to see if the module responds to "Initializing command set" when it fails.

How would I do this?

BTW, I just noticed that the module won't start up again if the time between a shut off and switch on is below 2-3 secs. Anyway, it is strange.

So, if I leave the module unpowered for more than 5 seconds, it'll always restart.

Maybe this is something absolutely "normal".

[rsocor01]

Connect a logical analyzer to tx and rx. They are not expensive. Digikey has one for $20. You can see the ones and zeroes going to the module and coming back to the pic. If you don't use a logic analyzer, it is like shooting in the dark.

About that 2-3 seconds observation, it is very likely that it is a power issue. Maybe you have a large cap that is holding a charge.


https://www.digikey.com/en/products/...DgGxgOwgF0BfIA

[flotulopex]

Connect a logical analyzer to tx and rx.

Okay. Maybe the one from the PICKit Logic Tool may do the trick.



I'll give it a try but I'm quite sure there must be something with the modules themselves.

Thanks

[rsocor01]

I use a Saleae analyzer with 16 channels. It makes my life a lot easier.

[flotulopex]

Thanks. Should have asked Santa a few days ago

Anyway, this might clearly be on my list of tools to acquire.