ESP8266 Community Forum

- Mon Dec 28, 2015 7:58 am #37312 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.

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- Mon Dec 28, 2015 4:06 pm #37338 Tx & Rx use plain old serial, not SPI.

- Mon Dec 28, 2015 4:24 pm #37345

Tx & Rx use plain old serial, not SPI.

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

- Mon Dec 28, 2015 4:45 pm #37346 Right ! but with 0V-3V logic level, not RS232 voltage level.