Use this forum to chat about hardware specific topics for the ESP8266 (peripherals, memory, clocks, JTAG, programming)

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By btidey
#69126 I think you'll find that the RST pin has a weak pull up of the order of 12K. Some modules may also have a capacitor to ground.

The CH/PD enable pin, however, should have an external pull up or be wired to Vd/
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By martinayotte
#69141 Never trust Internal PullUps, they are weaker than 12K, probably more around 100K.
See my very old post : viewtopic.php?f=6&t=4390&p=25390&hilit=antenna+effect#p25390
During those old days, even a guy complained that just touching the RES pin with a small camera screwdriver was producing random resets.
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By rudy
#69142 Internal pullups on port pins are typically between 50k-100k. They are a convenience and you have to evaluate your needs before you rely on using only them.