ESP8266 Community Forum

Hi!

For all those who have a STABLE, working module: What is the measured voltage (open and connected to the ESP8266) ?
And of course, if you experiencing uploading problems, resets, what are your measured voltages?
Maybe the voltage of your USB-SERIAL can be added too.

Maybe we find out something useful from this.

thx,
Edo

Edocecrous wrote:Hi!

For all those who have a STABLE, working module: What is the measured voltage (open and connected to the ESP8266) ?
And of course, if you experiencing uploading problems, resets, what are your measured voltages?
Maybe the voltage of your USB-SERIAL can be added too.

Maybe we find out something useful from this.

thx,
Edo

I am using lm1117 3.3v Regulator on 5v pin from cp210x USB serial. Open voltage 3.3v, connected voltage 3.3 but most USB serial or USB ftdi 3.3v pin not enough for esp

surely its the current that matters not the voltage - that's always going to be close enough to 3.3v to work, i guess voltage fluctuations could be an issue though.

the esp8266 is supposed to only need 300mA max, so its weird that not every usb device works as usb supplies 500mA, i guess the uarts don't always pass on the full current though.

my breadbord power supply works fine - but not when fed from a 5v 1a wallwart, i need to give it 9-12v even though its regulating down to 3.3v

If you read the datasheet for the CP210x USB to UART part you'll see that it's on chip 5V to 3.3V LDO regulator supports a max of 100 mA. You can't assume you'll get the full USB standard 500 mA...