Pixl.js with Wifi (ESP8266 ESP01s) - SOLVED

Great! By the way the flex cable is (I think?) kapton - so you don't really have to worry about heat affecting it.

If I wanted to do this with the regular Pixl.js what pins would I connect

It's basically the same:

• GND, VCC, RX, TX
  
• The CH_PD and BOOT pins to ensure it starts up outside of bootloader mode
  
  

However the big issue is the voltage regulator. Pixl.js's default one won't handle the power needed for the ESP8266, so you'll need to add another 3.3v regulator to it.

IMO it'd be far easier buying a cheap ESP8266 Arduino shield: http://www.espruino.com/arduino-esp8266