Hello electrical friends,
I have attached an image with the ESP 12E on it. I have a question:
are the red circled pins also usable as PUSH_BUTTONs ?
GPIO 6
GPIO 7
GPIO 8
GPIO 9
GPIO 10
GPIO 11
no. flash memory is on those pins
1 Like
Your link states: " Note: not all GPIOs are accessible in all development boards, but each specific GPIO works in the same way regardless of the development board you’re using. If you’re just getting started with the ESP8266, we recommend checking out our ESP8266 Guides." That is posted many times on your link. Rue does a great job with the ESP devices. Did you bother to follow the links? There is a section labeled "Best Pins to Use – ESP8266" That should answer your questions. If you take a pin that is labeled must be high during boot and pull it low it will crash the system. Follow the guidelines and try them one pin at a time. PCF857x expansion boards work great for buttons and are inexpensive. Run them on 3V3 and use 3.3K pull up resistors in the SCL and SDA connections.
Much Talk, less results 
I just have tested the pins. As @Juraj told us: they are made for memory. When I want to use them as digitalread, it allways errors.
Thanks for @Juraj for the quick answer.
Not much reading. This was in the link I gave you.
"GPIO6 to GPIO11 are usually connected to the flash chip in ESP8266 boards. So, these pins are not recommended to use."
Leo..
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