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feather s2 and mlx90614 3v wiring question
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feather s2 and mlx90614 3v wiring question

by jfranklyn on Wed Apr 28, 2021 2:04 pm

Hello all,
I'm working on the wiring for a featherS2 and an MLX90614 3V sensor. Can I use the 3V output pin on the featherS2 to wire the resistors to the SDA, SCL pins? I have it wired like this now and I'm getting an error that SDA, SCL need a pullup. Do I need to wire the resistors to the main 3V pin?
Thanks

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Re: feather s2 and mlx90614 3v wiring question

by blnkjns on Wed Apr 28, 2021 4:56 pm

Usually you can toggle pull-up resistors on ports in software:
Code: Select all | TOGGLE FULL SIZE
pinMode(pinNumber,INPUT_PULLUP);

Oops, this was CircuitPython teritory.
A bit more lines are needed:
https://learn.adafruit.com/circuitpytho ... tal-in-out

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Re: feather s2 and mlx90614 3v wiring question

by jfranklyn on Thu Apr 29, 2021 1:33 pm

thanks for this but I'm not using the GPIO pins. I'm only using 3V, GND, SDA, SCL. I need to know if I can use the 3v output pin 3VO as the source for the 2 pull up resistors that need to be connected to the SDA, SCL pins.

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Re: feather s2 and mlx90614 3v wiring question

by franklin97355 on Thu Apr 29, 2021 1:53 pm

I don't see why you couldn't but I'll check. Have you checked if the 3v power supply works?

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Re: feather s2 and mlx90614 3v wiring question

by adafruit2 on Thu Apr 29, 2021 3:34 pm

you should be able to but we dont use the feather s2 so much - we really recommend posting in their support forums/discord because there may be some detail we dont know about :D

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Re: feather s2 and mlx90614 3v wiring question

by jfranklyn on Fri Apr 30, 2021 3:21 pm

Hello all,
For the feathers2 you can't use the 3VO pin as the pull-up voltage for the resistors on the mlx90614 3V sensor. I switches the resistors to the main 3V pin and the sensors works as expected. It would be nice to know what the difference is between the 3V and 3VO pins.

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Re: feather s2 and mlx90614 3v wiring question

by adafruit2 on Fri Apr 30, 2021 3:27 pm

hihi, we dont manufacture the s2, so we aren't the definitive source of hardware info (and we dont want to say something wrong) - please ask the maker on their forums, they're very responsive!

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Please be positive and constructive with your questions and comments.