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By rudy
#68383 Espressif uses 12.5K pull down on their ESP-12S modules. I don't believe pull ups are enabled on GPIO15. EDIT: see below posts
Last edited by rudy on Fri Jul 21, 2017 7:39 am, edited 1 time in total.
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By btidey
#68408 The chart referred to indicates a weak pull up on GPIO15 with reset pulled low.

That is same as what I find and on the ESP-12F modules I measure it at around 37K. 12.5K pulls that down to 0.83V (3.3V supply). I find that a bit marginal for a reliable logic 0 which is supposed to be below 0.25xVd

Obviously the weak pull up will vary a bit but I can't find a spec on its limits.