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SH1107 Adafruit FeatherWing OLED - 128x64, Little to no brig
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SH1107 Adafruit FeatherWing OLED - 128x64, Little to no brig

by DerekCarter1972 on Sat Jul 02, 2022 10:30 pm

Got me a feather 128x64 Monochrome OLED FeatherWing SH1107, just using a Arduino RP2040 Connect ... but I see the demo text on the display only there is simply no brightness ... is there some reference voltage that provides the brightness ... it's simply unusable at the moment, Any thoughts? See included picture the adafruit display is top and an comparable display below in the same frame.
Attachments
SH1107_display.jpg
Adafruit vs another venders SH1107 display
SH1107_display.jpg (92.55 KiB) Viewed 147 times

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Re: SH1107 Adafruit FeatherWing OLED - 128x64, Little to no

by mikeysklar on Sun Jul 03, 2022 5:38 pm

Thank you for the photo.

The display uses 3v3 logic. The soldering looks like it could use another pass on the GND and 3v pins.

What are you using for the 3v3 supply? Can you minimize the setup to only this display and the driving RP2040 controller while running some demo code from the SH1107 provided library?

https://cdn-learn.adafruit.com/assets/a ... 1599165309
Attachments
Screen Shot 2022-07-03 at 2.26.48 PM.png
Screen Shot 2022-07-03 at 2.26.48 PM.png (22.09 KiB) Viewed 136 times

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Re: SH1107 Adafruit FeatherWing OLED - 128x64, Little to no

by DerekCarter1972 on Mon Jul 04, 2022 7:56 pm

OK re soldered the GND and 3v3 pins, erm stripped down the picture to the essentials. RP2040 is supplying the 3v3 via PIN2 of the NANO RP2040 Connect. Errm, I've used Digital-8 of the RP2040 board as the RST signal. Erm used the example code "https://learn.adafruit.com/adafruit-128x64-oled-featherwing?view=all#arduino-code" ... changed line 6 as follows:

FROM

Adafruit_SH1107 display = Adafruit_SH1107(64, 128, &Wire);

TO

Adafruit_SH1107 display = Adafruit_SH1107(64, 128, &Wire, 8);
Attachments
SCOPE.jpg
This is RST pin on startup
SCOPE.jpg (89.25 KiB) Viewed 132 times
SH1107_display_simple.jpg
The striped down breadboard
SH1107_display_simple.jpg (113.49 KiB) Viewed 132 times

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Re: SH1107 Adafruit FeatherWing OLED - 128x64, Little to no

by adafruit2 on Mon Jul 04, 2022 8:27 pm

it doesnt look bad - i actually think you are overdriving the other display - overdriving makes for a bright dispaythat burns out much faster
you could try changing the contrast
https://github.com/adafruit/Adafruit-GF ... OLED.h#L68

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Re: SH1107 Adafruit FeatherWing OLED - 128x64, Little to no

by DerekCarter1972 on Tue Jul 05, 2022 2:24 pm

Alas in order to capture the initial picture I had to turn off the lights to get my phone to give a long enough exposure to see anything ... the second posted picture of the circuit is under normal lighting and you can't even see the text on the screen. Anyway as show below ... got it working ...

Working_SH1107.jpg
YAY Worknig
Working_SH1107.jpg (116.86 KiB) Viewed 119 times


alas by buying a second display ... urgh ...

Replacement_Theropy.jpg
Cought
Replacement_Theropy.jpg (106.3 KiB) Viewed 119 times


interestingly I did notice there was a QC sticker on one and not on the other ... no prizes for guessing which worked and which had no brightness ... !!!

All_Not_Alike.jpg
Huh what's this?
All_Not_Alike.jpg (121.61 KiB) Viewed 119 times

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Re: SH1107 Adafruit FeatherWing OLED - 128x64, Little to no

by mikeysklar on Tue Jul 05, 2022 3:03 pm

If one display is significantly lower in brightness on the same hardware setup you have shown in the last photo we can replace that for you.

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Re: SH1107 Adafruit FeatherWing OLED - 128x64, Little to no

by DerekCarter1972 on Tue Jul 05, 2022 4:20 pm

Cool ... I'll attempt to take it up with my supplier ... sourced it through Pimoroni in the UK here, Thanks again for the input ...

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Re: SH1107 Adafruit FeatherWing OLED - 128x64, Little to no

by adafruit2 on Wed Jul 06, 2022 1:03 pm

thanks! a wierd one!

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Please be positive and constructive with your questions and comments.