Having strange noise on Oled screen
Running on Leonardo Software SPI using included level shifter and capacitor.
https://www.youtube.com/watch?v=wu5LazJDqsQ
Found that sometimes after the ''display.display();'' command noise appeard on screen
in the video after every number I repeat the ''display.display();'' command 10 times to have the noise occur more frequently.
using the '' display.drawBitmap'' to draw bitmap images of the numbers to the screen.
What may cause this noise to occur?
What can I check?
The arduino is powered from usb port from laptop.
powering the Oled and levelshifter from the arduino on the 3.3V pin.
exactly as in the wiring example on the adafruit tutorial
https://learn.adafruit.com/2-7-monochro ... g-and-test
Running the same script on a DUE without the level shifter works fine. noise is gone.
https://www.youtube.com/watch?v=AXTPW9r00X0
Hope to get some insight
Greets from Amsterdam / The Netherlands
Remko van Dokkum
Oled 128x64 with strange noise
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Please be positive and constructive with your questions and comments.
- adafruit_support_carter
- Posts: 29056
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Re: Oled 128x64 with strange noise
I'm not sure I heard the noise in the video. However, there is a boost converter on the display that can sometimes make noise. It might be that.
- rvdokkum
- Posts: 26
- Joined: Fri May 16, 2008 12:46 pm
Re: Oled 128x64 with strange noise
The noise I was talking about was the visible noise. Along the edges of the numbers on screen gray blurry pixels apear now and then.
The noise appears only short. But if you pause the movie at the right time you see it.
https://flic.kr/p/2ePfxrw
The noise appears only short. But if you pause the movie at the right time you see it.
https://flic.kr/p/2ePfxrw
- adafruit_support_carter
- Posts: 29056
- Joined: Tue Nov 29, 2016 2:45 pm
Re: Oled 128x64 with strange noise
Oh, OK. Now I see it. Thanks for clarifying.
It might be a connection issue. Can you post a photo of your setup showing how you have everything wired together - the display / level shifter / Leondardo.
It may also be a software issue. Do you get the same thing if you run the example test sketch?
https://learn.adafruit.com/2-7-monochro ... -demo-4-11
It might be a connection issue. Can you post a photo of your setup showing how you have everything wired together - the display / level shifter / Leondardo.
It may also be a software issue. Do you get the same thing if you run the example test sketch?
https://learn.adafruit.com/2-7-monochro ... -demo-4-11
- rvdokkum
- Posts: 26
- Joined: Fri May 16, 2008 12:46 pm
Re: Oled 128x64 with strange noise
I moved on to a setup with a DUE.
No problems.
Same script
No longer able to test with the Leonardo and level shifter.
No problems.
Same script
No longer able to test with the Leonardo and level shifter.
- adafruit_support_carter
- Posts: 29056
- Joined: Tue Nov 29, 2016 2:45 pm
Re: Oled 128x64 with strange noise
OK. That works too.
Please be positive and constructive with your questions and comments.