ESP8266 5V…12V voltage regulator

I’ve just received my ESP8266 expansion IO board but the pcb didn’t embed the 3.3V regulator (as expected according to the pictures from the eBay seller) 😦

As I have plenty of 5V, 9V and 12V salvaged power supplies laying around (and not a single 3.3V), I was very interested to use them with my ESP8266 ESP-07 module…

It was not a big deal to find out the needed regulator (with compatible pinout) but, as Google was not my friend this time, the operation deserves a few lines of blogging with IC reference… 🙂

The ‘trick’ is to remove the 0 Ohm shunt resistor (which directly connects the VCC pin of the adapter board to the VCC of the ESP module VCC when not using a voltage regulator).

Once this resistor unsoldered, the VCC pin of the expansion board provides power supply to the voltage regulator (to be soldered on the back).

I chose the AP1115BY33G-13 LDO (low dropout) regulator which I found to be cheap (0.3 €) and easy to buy (RS, Mouser, Digi-Key, Farnell, …). Here is a link to the datasheet.


1 thought on “ESP8266 5V…12V voltage regulator

  1. Anonymous

    if U dont place a capacitor (min 100mkF) after voltage regulator – Ur ESP will restart and crash under high processor load



Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s