Measuring 12v on ESP32 or ESP8266

ESPHome
41

you mean something like this?

https://it.aliexpress.com/item/1005004904872120.html?spm=a2g0o.productlist.main.1.3cb06f83K5Mlvg&algo_pvid=86632f94-566c-443c-b0c5-1db51a03cedd&algo_exp_id=86632f94-566c-443c-b0c5-1db51a03cedd-0&pdp_npi=4%40dis!EUR!3.69!3.69!!!4.02!4.02!%402103894417271007217707840e9598!12000030968453858!sea!IT!2692602029!X&curPageLogUid=XQeVPUj1Qra6&utparam-url=scene%3Asearch|query_from%3A

42

There in no way to use voltage divider to power something that draws variable current.
Esp can draw anything between 0 and 250mA and the voltage has to remain between 2.5V and 3.6V. Make your math… Otherwise who would buy expensive linear voltage regulators and buck converters… :wink:

1 Like
43

Yes, I use several like this.

44

Yes and no.
Yes - your blind spot was due to the loads w/ ESP32, which being an SOC, there are maybe millions, if not more, of transistors keeps on and off, doing all kinds of stuff… essentially a bunch of mini switches for your programming…

And no, you should not consider doing voltage divider at all. Use buck converters please.

1 Like
45

Ok, understood! Something like this.
I’m ordering the buck converter.

image
image1802×894 195 KB

I have a quick question. From the picture below, it seems that the connections for Input, GND, and Output should be made to both pins of each pair. I assume it means one of the two pins and not both, correct?
image

Thanks to all for the suggestions

46

correct, one is enough.

1 Like