ESP 8266 web server using arduino I have built a system using arduino and Ethernet shield. It gets rgb values through URL and changes an rgb led's value. Today I bought an ESP 8266 12E. I want to change to wifi but I cannot find an arduino library that uses spi to connect the arduino to the ESP. I do not want to use only the ESP. Do you know any libraries to do the job or any tutorials.
The ESP communicates using the UART, not SPI. It uses modem-like AT commands. Unless you write your own ESP firmware, in which case how it communicates is up to you - and so is the accompanying Arduino library.