ESP8266 Community Forum

- Tue Jan 13, 2015 4:48 am #7179 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

- Tue Jan 13, 2015 5:14 am #7180

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

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- Tue Jan 13, 2015 7:00 am #7192 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

- Tue Jan 13, 2015 1:40 pm #7215 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...