Powering up an esp01

Other Hardware Motors, Mechanics, Power and CNC
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So, from what I've researched on the internet the esp01 needs about 3.3v to 3.6v and can handle a current of 20ma to 170ma.

for the power source I will be using a 12v 2A AC/DC adapter, this means that i should step down the volt from 12v to about 3.5v and I have done this by using a buck converter.

reducing the voltage using the buck converter increases the current and, in this case, the current has increase from 2A to about 4A after stepping down the voltage. So, in order to reduce the current to about 160ma I have used a 22ohm resistor

the image below shows how I have wired up the circuit.

circuit (1)

Now for the problem (YAYYY!!).

the red light on the esp01 indicates whether the esp01 is powered up but when I power up the circuit the red light on the esp01 just flashes for about half a second and goes off
meaning the esp01 is not powered. I checked the power on the whole circuit using a multimeter and all the readings seem fine

can someone please explain what I'm doing wrong

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Read and follow this link: How to get the best out of this forum - Using Arduino / Project Guidance - Arduino Forum

That's completely wrong. Maximum design I/O current is 20 mA.

The esp runs from 3.3 volt as I've got it.

What made You think that? Using a serial resistor in the powering line is just pure ignorance, and completely wrong.

That formula works for transformers, not for buck converters. The output capacity depends on the converter that You didn't post any datasheet link to.

As You say, it indicates a sever error. No surprise.

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Perhaps, not looking at documentation or at what other people are doing.

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