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GPIO15
Posted:
Sun Jun 10, 2018 6:48 amby Gert de Vries
I programmed two ESP's (esp-7 and esp-12) for wifi interaction and deep sleep without connecting GPIO15 to GND. This worked fine. And they still do. A third module (esp-12) did not. Why?
Is it necessary to use a resistor or can GPIO15 directly be tied to GND, if not used.
Re: GPIO15
Posted:
Sun Jun 10, 2018 3:56 pmby btidey
Normally one puts a medium value pull down (~4k7) on GPIO15 to GND to ensure it is correct 0 state at boot to get normal run mode. Although it is possible to skip the resistor and tie direct to GND this is not very good practice as a program could set GPIO15 to output and set it high. I know people will say I won't do that but mistakes can be made.
Re: GPIO15
Posted:
Sun Jun 10, 2018 6:41 pmby rudy
Shorting 15 to and is not a good idea. On most of my boards I have an led on 15 and it will often be on when in bootloader. (don't know why)