Tri-state / Hight Impedance ESP8266 GPIO (MicroPython)

Q&A Forum › Tri-state / Hight Impedance ESP8266 GPIO (MicroPython) – Solution use: Pin.OPEN_DRAIN

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Gary asked 3 years ago

Hi Sara, et all,
Can I change an ESP8266 pin dynamically (MicroPython)
Any code examples appreciated.
Gary

6 Answers

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Sara Santos Staff answered 3 years ago

Hi.
What do you mean by dinamically?
Regards,
Sara

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Gary answered 3 years ago

In a python script can I set a a GPIO as output then ie to set a pin high, and then imedially after set the same pin back to input?

This would be like a
Tri-state

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Gary answered 3 years ago

Or can I use a GPIO as a
Tri-state

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Sara Santos Staff answered 3 years ago

Hi.
Yes, I think you can do that.
Check the documentation here: https://docs.micropython.org/en/latest/library/machine.Pin.html
See the example “usage model” and take a look at p0 that is first declared as an output, and then it is changed to an input.
Regards,
Sara

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Gary answered 3 years ago

Thanks looks good – from your ref:

Pin.OPEN_DRAIN – If the value is ‘0’ the pin is set to a low voltage state. Otherwise the pin is set to high-impedance state.

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Sara Santos Staff answered 3 years ago

Great!
I’m glad you found a solution.
I’ll mark this issue as resolved. If you need further help, you just need to open a new question in our forum.
Regards,
Sara