ESP8266 Community Forum

- Mon Nov 24, 2014 8:30 am #3223

I'm using the 3.3v output from arduino. Why?

Well, it is mentionned several times in the forum that the ESP needs around 300mA in surge when transmitting.
The Arduino 3.3V is limited to 100mA, this means that during the surges, the 3.3V will drop strongly.

You need an external 3.3V power supply. If you don't have one, take a 5V and add a 3.3V Linear Regulator.

- Mon Nov 24, 2014 8:35 am #3224

What do you use as 3.3v power source for wifi module?

I'm using the 3.3v output from arduino. Why?

uno cannot deliver the 350ma that the esp needs

- Mon Nov 24, 2014 4:04 pm #3260

Well, it is mentionned several times in the forum that the ESP needs around 300mA in surge when transmitting.
The Arduino 3.3V is limited to 100mA, this means that during the surges, the 3.3V will drop strongly.

You need an external 3.3V power supply. If you don't have one, take a 5V and add a 3.3V Linear Regulator.

I know it.. But the module work very well without any problems!

- Mon Nov 24, 2014 6:44 pm #3272

Well, it is mentionned several times in the forum that the ESP needs around 300mA in surge when transmitting.
The Arduino 3.3V is limited to 100mA, this means that during the surges, the 3.3V will drop strongly.

You need an external 3.3V power supply. If you don't have one, take a 5V and add a 3.3V Linear Regulator.

I know it.. But the module work very well without any problems!

I did the same in the beginning and I got random busy messages and reboots.