ESP8266 Community Forum

Posted: **Mon Dec 28, 2015 7:58 am**

From what i've read SPI uses 4 wires, can work with a minimum of 3. This i understand.
But, programming my ESP8266-01 from my FTDI (usb to serial) it only uses 2 wires, namely RX & TX

Please can someone explain, i have attached the usual wiring which shows RX & TX.

Please note, i know some ppl might say ground wire is 3rd wire but i am discounting it!

Cheers.

Posted: **Mon Dec 28, 2015 4:06 pm**

Tx & Rx use plain old serial, not SPI.

Posted: **Mon Dec 28, 2015 4:24 pm**

eduperez wrote:Tx & Rx use plain old serial, not SPI.

So it's just asynchronous rs232 comms without cts, dtr etc

Posted: **Mon Dec 28, 2015 4:45 pm**

Right ! but with 0V-3V logic level, not RS232 voltage level.

ESP8266 Community Forum

SPI using only two wires, TX & RX ??

SPI using only two wires, TX & RX ??

Re: SPI using only two wires, TX & RX ??

Re: SPI using only two wires, TX & RX ??

Re: SPI using only two wires, TX & RX ??