Pull up Error with HT16K33 14-Seg QT board

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funkfinger
 
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Pull up Error with HT16K33 14-Seg QT board

Post by funkfinger »

Hi, I am getting a `RuntimeError: No pull up found on SDA or SCL; check your wiring` in Circuit Python REPL when connecting a QT PY board(s) with the HT16K33 board. I was able to get it to work using the top I2C connectors and a STEMMA QT breakout cable, so it appears to be something with the connector or the circuit board? I can also get it to work when passing if first through another STEMMA QT board (which makes sense because that has the pull up resistors in place). This is happening on the 2 boards I soldered together.

directly plugged into STEMMA connector
IMG_5240.png
IMG_5240.png (843.65 KiB) Viewed 116 times
board connected to top I2C pins
IMG_5241.png
IMG_5241.png (917.95 KiB) Viewed 116 times
connected through another STEMMA QT board
IMG_5242.png
IMG_5242.png (882.23 KiB) Viewed 116 times
Thanks for your help!

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adafruit2
 
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Re: Pull up Error with HT16K33 14-Seg QT board

Post by adafruit2 »

hiya, what if you connect to the other QT port on the breakout board?

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funkfinger
 
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Re: Pull up Error with HT16K33 14-Seg QT board

Post by funkfinger »

Yeah, I tried that, same result. The board I just received is unlike the board on GitHub. Is this something that is normal? The GitHub board pulls up the SDA and SCL lines to a different pin on the top connector.

My Boards:
10K resistor between screen print VIO and SDA / SCL - VIO is trace V+ trace : VHi screen print on GitHub board

GitHub board:
10k resistor between VDDIO (screen print VIO) and SDA / SCL

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adafruit2
 
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Re: Pull up Error with HT16K33 14-Seg QT board

Post by adafruit2 »

ooh that could be you got the wrong PCB, can you post a pic of the back showing the version letter code?

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funkfinger
 
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Re: Pull up Error with HT16K33 14-Seg QT board

Post by funkfinger »

Here's a pic, I ordered 8 of them (Order #2920027-1755173743) and it looks like they are all the same
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IMG_5245.jpg
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adafruit2
 
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Re: Pull up Error with HT16K33 14-Seg QT board

Post by adafruit2 »

woops that rev B should not have been sold :( we are going to go thru stock right now and make sure no more are shipped

we can get you rev C, they had the Vio/VHi swap. or if you are in a rush, you can use the ones you've got if you jumper Vio and VHi on the pin headers. let me know!

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funkfinger
 
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Re: Pull up Error with HT16K33 14-Seg QT board

Post by funkfinger »

I am not in a rush, but I can work around the problem with the two I’ve soldered up already. How should we handle getting the updated boards?

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adafruit2
 
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Re: Pull up Error with HT16K33 14-Seg QT board

Post by adafruit2 »

email support@adafruit with a link to this thread they'll send you two rev C boards!

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