ESP8266 Community Forum

That the ESP8266 needs quite a lot of power is no secret.
This is how the voltage drops on my ESP-01 module almost 300mV. It's repeated every 100ms.
This is with the module connected to my wifi, but doing nothing.

I'm literally powering the ESP-01 directly on the connector with an ATX PSU, so power shouldn't be an issue.
Putting a cap on the supply won't do much if it ain't like 10mF or so.
Is this a ESP8266ex issue or is it a ESP-01 (from AI-thinker) issue? Or some thing else?
Do you experience the same with other modules?

eketjall wrote:I'm literally powering the ESP-01 directly on the connector with an ATX PSU, so power shouldn't be an issue.

Why not? I'm sure the power supply was not designed for such a light load and hold the output constant. Put a linear regulator in front of the esp and power it from the +5 volt line.

I see very little drop when powered from a good 500mA rated linear regulator.

The ESP wasn't the only load on the PSU but OK, it's a possibility.

What is "very little" and do you see the same pattern every 100ms?
What module are you using?

My main concern realy is that it looks exactly the same when I power the module from batteries which make it less convenient in such a situation.
I was hoping to leave the regulator out.

We are remembering the WIFI transmits a "beacon" 10 times a second.... hmmm... thats 100ms!

https://en.wikipedia.org/wiki/Beacon_frame

RichardS