Which ESP8266EX microcontroller pins found on the ESP01 module are not used or not connected to anything?

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kyuchumimo
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Joined: Sun Mar 20, 2022 1:14 am

Which ESP8266EX microcontroller pins found on the ESP01 module are not used or not connected to anything?

Post by kyuchumimo » Sun Mar 20, 2022 1:34 am

As you may know, the ESP01 module has only 4 GPIO pins, and if you want to use the SPI communication protocol, you have to specify the sck, mosi and miso pins, otherwise, the following error will occur:
`ValueError: must specify all of sck/mosi/miso`

In my project, I don't need to use miso, so I need to assign it to a pin of the GPIO ports that is not used by any component of the ESP01 module.

I am using the lastest MicroPython firmware (v1.18), esp8266-1m

Here is the pinout of the ESP8266EX microcontroller for reference:
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Roberthh
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Joined: Sat May 09, 2015 4:13 pm
Location: Rhineland, Europe

Re: Which ESP8266EX microcontroller pins found on the ESP01 module are not used or not connected to anything?

Post by Roberthh » Sun Mar 20, 2022 8:50 am

GPIO4, 5, 12, 13, 14, 15, 16 are for instance exposed on a WEMOS D1 Mini and free usable. GPIO15 is as well labeled HSPICS, GPIO16 is also the /WAKE signal.
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