esp adaptor board?

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esp adaptor board?

#1 Post by uxhamby » 09 Dec 2018, 21:04


On this style of esp adaptor board, am I safe to assume that the 3 resistors are gpio pull ups / downs for proper boot state?

I can't find a schematic of these boards anywhere, can anyone point me to one?


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Re: esp adaptor board?

#2 Post by Drum » 10 Dec 2018, 09:29

I am not aware if any official schematics and have seen several different versions of these, the ones I purchased have pads for an 1117 type voltage regulator which I would never use. You can see the traces under the white paint pretty easily, make your own schematic and be sure it is correct for the version of the board you have. You can also use a ohm meter to check.

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Re: esp adaptor board?

#3 Post by budman1758 » 14 Dec 2018, 05:37

I have some of those boards.
R1 pulls GPIO2 up
R3 pulls CH-PD up
R2 is connected to the pad on the back and is unused unless you install a voltage regulator there.
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Re: esp adaptor board?

#4 Post by LisaM » 06 Jan 2019, 20:10

ESP32 boot states and GPIO pins are perfectly described here: ... -Selection



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