Use STEMMA QT to Connect a ESP32-S3 QT PY to a ESP32-S3-TFT

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JMellen
 
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Use STEMMA QT to Connect a ESP32-S3 QT PY to a ESP32-S3-TFT

Post by JMellen »

Is it possible to use the STEMMA QT ports on the ESP32-S3-TFT and the ESP32-S3-QT-PY to connect the two CPUs? I am wondering if there will be an issue with the power lines or (ideally) if I could power the QT from the ESP32-S3-TFT?

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adafruit_support_mike
 
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Re: Use STEMMA QT to Connect a ESP32-S3 QT PY to a ESP32-S3-TFT

Post by adafruit_support_mike »

You can connect the boards that way, but they won't be able to communicate with each other until you program one of them to be an I2C periperhal.

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JMellen
 
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Re: Use STEMMA QT to Connect a ESP32-S3 QT PY to a ESP32-S3-TFT

Post by JMellen »

Thanks for the response! I just want to verify that I don’t have to worry about the power line in the stemma causing an issue if they are both connected to separate computers via usb C, but also, will the ESP32-S3-TFT power the QTPy if I disconnect the USB C?

Thanks!

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Re: Use STEMMA QT to Connect a ESP32-S3 QT PY to a ESP32-S3-TFT

Post by adafruit_support_mike »

JMellen wrote: Sun Mar 05, 2023 10:10 am I don’t have to worry about the power line in the stemma causing an issue if they are both connected to separate computers via usb C
This isn't guaranteed to be safe.

You can send power from the ESP32-S3-TFT to QT Py through the STEMMA cable, or you can power the QT Py through a USB cable connected to a computer, but don't do both at the same time.

You never want to connect two power supplies in parallel. You can't be sure their voltages are exactly the same, and if there's a difference, one will try to push current backwards through the other. The result can damage either or both power supplies.

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JMellen
 
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Re: Use STEMMA QT to Connect a ESP32-S3 QT PY to a ESP32-S3-TFT

Post by JMellen »

Ok, this is what I was afraid of… thanks for the quick responses!!

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