128x64 OLED STEMMA QT not working

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lemdavis
 
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128x64 OLED STEMMA QT not working

Post by lemdavis »

I have a Metro ESP32-S2 attached to a Monochrome 1.3" 128x64 OLED graphic display - STEMMA QT / Qwiic using I2C. I have been unable to get two different displays to work with your 128x64 example code. The displays just remain black. The green LED on back is lit. Does anyone know what the problem may be?

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Re: 128x64 OLED STEMMA QT not working

Post by adafruit_support_carter »

As a quick test, try running an I2C scan to see if the OLED can be seen:
https://learn.adafruit.com/scanning-i2c ... i2c-basics

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lemdavis
 
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Re: 128x64 OLED STEMMA QT not working

Post by lemdavis »

The scan is not finding the OLED board, it only finds one other board (INA219). Do I need to cut the J1 and J2 traces?

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Re: 128x64 OLED STEMMA QT not working

Post by adafruit_support_carter »

No, for I2C the default closed configuration is correct:
https://learn.adafruit.com/monochrome-o ... ep-3050993

Please post a photo showing how you are connecting the OLED to the Metro.

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lemdavis
 
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Re: 128x64 OLED STEMMA QT not working

Post by lemdavis »

I have it connected to another STEMMA board (daisy chain). Please note that another OLED board (not an Adafruit) works when connected in this fashion.
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Re: 128x64 OLED STEMMA QT not working

Post by adafruit_support_carter »

Do you have another Arduino board that could be used for testing? So we can rule out all the other things going on with that setup.

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Re: 128x64 OLED STEMMA QT not working

Post by lemdavis »

I will try it with a feather board.

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Re: 128x64 OLED STEMMA QT not working

Post by lemdavis »

I tried it with CircuitPython on the Feather board and it worked. I then went back to the Metro and tried the Arduino version of your demo. The problem was the OLED_RESET setting. I changed it to be -1 rather than 4.

I also found that the display needs to be powered off and on when a change is made. At first the change to -1 did not work, but did after powering on.

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