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128x64 OLED wiring diagram does not match text
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128x64 OLED wiring diagram does not match text

by dconner on Sat Mar 21, 2020 1:58 pm

On the Learn Featherwing OLED page
    https://learn.adafruit.com/adafruit-oled-featherwing/python-circuitpython-wiring
the text listing does not match the diagram for the 128x64 OLED display for I2C operation. I think the text should show connect SCL to CLK and SDA to Data.

As I've tried the connection both ways without success that is probably not the source of my problem. I have used the featherwing 128x32 OLED display and have run the Example code with complete success. using the SSD1306 128x64 board I get no response on the display. The error on the monitor shows:
ValueError: Unable to find I2C Display at 3c

Any help on what to try to diagnose or fix the problem.

UPDATE:
I found an earlier page on using the 1306 OLED display: https://learn.adafruit.com/micropython-hardware-ssd1306-oled-display/circuitpython

That had the following text:

If you are using a 128x64 display, the I2C address is probably different (0x3d), unless you've changed it by soldering some jumpers:

I had soldered the jumpers on the back for I2C operation --- but since things arent working, why not check (0x3d). It worked!
So my problem is fixed. I will go back and reflow the solder jumpers and see if it was a cold solder joint.

dconner
 
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Re: 128x64 OLED wiring diagram does not match text

by adafruit_support_carter on Mon Mar 23, 2020 3:04 pm

Thanks for spotting that. Does looks like a typo. The guide has been updated.

adafruit_support_carter
 
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Joined: Tue Nov 29, 2016 2:45 pm

Please be positive and constructive with your questions and comments.