ESP8266 Community Forum

- Sat May 21, 2016 7:54 pm #47785 Hi , I am about first connection and flashing the esp8266 module .
I have found couple of tutorials where they say that the output of the USB to Serial converter Current is not enough for this and that i should use another power supply with voltage regulator

Do not use 3.3V pin of the USB to Serial converter to power the ESP8266 module because power supplied by the USB port is not sufficient to work the ESP8266 module.

So the tutorials connections looks like this :



But then i ask myself maybe this tutorials are old and the FT232RL model that i have has fixed output of 3.3v .

The FT232RL i am using has vcc output pin(which normaly output 3.3v) + another pin that writen on it 3.3v :




Also i have seen another tut where it can be connected directly :
http://rancidbacon.com/files/kiwicon8/E ... _1.0.4.pdf





Should i use another supply source ? or i can use the vcc output from the FT232RL ?

- Sun May 22, 2016 3:55 am #47797 Hi, the current advice is use an external supply. Anything between 500mA and 1A is good, if it's above 1A you will need a capacitor as well as the larger supplies don't seem to react fast enough to the change in load when the ESP transmits (increases from 70mA to 250mA). I use 100uF with all supplies.

Also note that in the last photo the ESP is on a breakout board that has a built in voltage regulator and level converters, that has enabled them to run it from the USB 5V supply (which may just be good enough).

- Sun May 22, 2016 4:08 am #47799 FT232RL : 3.3V < 50mA. With FT232R can flash esp with 3V3OUT, but can not run esp.

3V3OUT Output
+3.3V output from integrated LDO regulator. This pin should be decoupled to ground using a 100nF capacitor. The main use of this pin is to provide the internal +3.3V supply to the USB transceiver cell and the internal 1.5kΩ pull up resistor on USBDP. Up to 50mA can be drawn from this pin to power external logic if required. This pin can also be used to supply the VCCIO pin.

- Sun May 22, 2016 6:56 am #47804 Which breakout board is the one seen in the last photo above...It has an esp8266 with ceramic antenna soldered to a board with two push buttons.