The ESP8266 is pretty legendary, and apparently ~$2 in a quantity of 1. (just google, for example google "esp8255 ali".) It's unreal. And getting it onto a pi zero? Wow.mthomason wrote:I like the look of this solution best, so far. It uses SPI on the GPIO pins and doesn't touch USB, so it can be used on a Pi Zero to add WiFi while leaving the USB OTG port usable as an actual OTG port (so you can connect the zero directly to a PC as a peripheral using the Linux USB Gadget modules.) I'm going to give it a go using an ESP-201, which comes in a larger/easier format to work with, as well as being a bit cheaper than most other ESP8266 modules as it doesn't have any onboard flash memory.
I mean basically imagine the cheapness of this: http://www.aliexpress.com/item/NodeMcu- ... 03041.html
but paired with 1 GHZ and 512 MB of RAM to do any processing you want. If that isn't worth $2.00 I don't know what is.