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
board connected to top I2C pins
connected through another STEMMA QT board
Thanks for your help!
Pull up Error with HT16K33 14-Seg QT board
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- funkfinger
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- adafruit2
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- Joined: Fri Mar 11, 2005 7:36 pm
Re: Pull up Error with HT16K33 14-Seg QT board
hiya, what if you connect to the other QT port on the breakout board?
- funkfinger
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- Joined: Sun Jul 13, 2014 10:29 pm
Re: Pull up Error with HT16K33 14-Seg QT board
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
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
- adafruit2
- Posts: 22148
- Joined: Fri Mar 11, 2005 7:36 pm
Re: Pull up Error with HT16K33 14-Seg QT board
ooh that could be you got the wrong PCB, can you post a pic of the back showing the version letter code?
- funkfinger
- Posts: 11
- Joined: Sun Jul 13, 2014 10:29 pm
Re: Pull up Error with HT16K33 14-Seg QT board
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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- adafruit2
- Posts: 22148
- Joined: Fri Mar 11, 2005 7:36 pm
Re: Pull up Error with HT16K33 14-Seg QT board
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!
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!
- funkfinger
- Posts: 11
- Joined: Sun Jul 13, 2014 10:29 pm
Re: Pull up Error with HT16K33 14-Seg QT board
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?
- adafruit2
- Posts: 22148
- Joined: Fri Mar 11, 2005 7:36 pm
Re: Pull up Error with HT16K33 14-Seg QT board
email support@adafruit with a link to this thread they'll send you two rev C boards!
Please be positive and constructive with your questions and comments.