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I want to power ESP32 with 230V AC and I don’t know how to do it. The requirement is that it must never overheat. What components should i use? The ESP will be in small space with no airflow. Will it be even possible?

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    with an AC/DC switching power supply?
    – Juraj
    Sep 28 '21 at 11:50
  • What do you mean "overheat"? The ESP32 is robust microcontroller, according to the datasheet, the board can work in a temperature range of -40 to +125 degrees Celsius. Do you think that your setup will get that hot?
    – Coder9390
    Sep 28 '21 at 12:08
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    And regarding the power, you can just use a standard 5V Wall adapter with a voltage regulator
    – Coder9390
    Sep 28 '21 at 12:09
  • I’m not experienced with changing voltage and this kind of stuff, but I expexted it to produce quite a lot of heat. Am I wrong?
    – krystof18
    Sep 28 '21 at 12:10
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    I would just suggest standard USB chargers. They give you 5V and are very cheap
    – chrisl
    Sep 28 '21 at 12:13
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The folks over at Random Nerd Tutorials offer a solution for this exact scenario using a HLK-PM03 Hi-Link 100-240V AC to 3.3V 1A DC converter. They add electrical and thermal fuses to mitigate some of the possible failure modes of over-temperature or over-current.

The specifications of the HLK-PM03 are here. I suspect there will be a few alternatives available that do a similar function.

My suggestion is to be hyper-aware of the safety issues of dealing with mains power, and to be realistic about your own capabilities.

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