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Stemma cables and the clue
Moderators: adafruit_support_bill, adafruit

Please be positive and constructive with your questions and comments.

Stemma cables and the clue

by oldblackcrow on Mon Feb 08, 2021 10:08 am

So, I connected stemma I2C cables to my sensors to connect to my PyPortal. But when I look at the I2C connector on your website that connect from a sensor to the clue (the larger to the smaller), the wires don't match up... Seems the power and ground are on the opposite sides.

Can I get a clarification on this and a link to the proper connector? Thanks!

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Re: Stemma cables and the clue

by DanGR on Mon Feb 08, 2021 10:32 am

Here is the tutorial on the subject:
https://learn.adafruit.com/introducing- ... comparison

Dan

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Re: Stemma cables and the clue

by adafruit_support_carter on Mon Feb 08, 2021 4:17 pm

Can you clarify what information you are looking at? The connectors have an index tab so can only be installed in one direction.

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Re: Stemma cables and the clue

by oldblackcrow on Mon Feb 08, 2021 9:33 pm

DanGR wrote:Here is the tutorial on the subject:
https://learn.adafruit.com/introducing- ... comparison

Dan


Thanks for the link!

So, I guess I have to make one. Just thought there would be a product already.

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Re: Stemma cables and the clue

by DanGR on Mon Feb 08, 2021 9:44 pm

The mention of crossed wires made me miss that you were looking for an adaptor for big to small. This is the cable to connect to STEMMA QT or the small size.
https://www.adafruit.com/product/4424

Dan

Edit changed link to fix my error.
Last edited by DanGR on Mon Feb 08, 2021 10:00 pm, edited 1 time in total.

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Re: Stemma cables and the clue

by adafruit_support_carter on Mon Feb 08, 2021 9:50 pm

If you want to connect STEMMA QT breakout boards to the PyPortal, use this:
https://www.adafruit.com/product/4424

The connector on the PyPortal is JST PH (aka STEMMA)
The connector on most breakouts is JST SH (aka STEMMA QT)

If you are finding something with crossed or backwards wires, please let us know exactly what it is.

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Re: Stemma cables and the clue

by DanGR on Tue Feb 09, 2021 9:12 am

@adafruit_support_carter

The cable I suggested but changed the link is:
https://www.adafruit.com/product/4528 this is a Grove connector.

The proper cable you linked is the JST SH to JST PH adaptor however it in NOT in the STEMMA QT cable section:
https://www.adafruit.com/category/619

I have an ongoing thread on the subject so I brought the issue up there:
viewtopic.php?f=8&t=174153&p=853807#p853807

Dan

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Re: Stemma cables and the clue

by oldblackcrow on Tue Feb 09, 2021 10:52 pm

Thanks y'all!

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Please be positive and constructive with your questions and comments.