ESP8266 Community Forum

- Tue Jan 05, 2016 7:04 am #37958 I'm using a 560 and a 1k ohm resistor. That around 3.2V. The arduino uno 5V pin should have enough current right? Why doesn't it work with this setup? I've go the right voltage. I'm sorry for my questions but I don't have much experience with electrical things.

Why do I have to connect GPIO2/GPIO0 with a 4k7 or a 10k resistor? Didn't found that in the description of the ESP8266.

- Tue Jan 05, 2016 10:28 am #37969 First, @lethe is right and I didn't saw it in your original post : you can't power supply any ESP using simple voltage divider, that is the Ohm's Law !
Although you have 3.2V while no load connected, as soon as you connect the ESP, it will drop maybe as low as 0.1V.
You need to use voltage regulator such as AMS1117 to reduce the 5V to 3.3V.
For the GPIO2/GPIO0, it is well documented in many place, they both need to be HIGH to get into normal exec mode.
Here is the explanation for all the different boot modes :
https://github.com/esp8266/esp8266-wiki ... ot-Process

- Tue Jan 05, 2016 10:36 am #37971 To add to that, I've found this document super helpful as I've been learning this stuff: http://www.forward.com.au/pfod/ESP8266/ ... index.html

- Tue Jan 05, 2016 11:07 am #37976 Thank you so much.
So I need a 5V to 3.3V voltage regulator with a least 300mA? Hopefully I can buy one on Thursday.
I've got some 4k7 and 10k resistor at home. Which one would you recommend picking up?