Homebrew WiFi Shield

Having just finished development of the new m0xpd / Kanga ESP8266 - AD9834 board, I find myself with a few WiFi components knocking about on the bench - so I figured it would be fun to try to make a WiFi shield for an Arduino… Using an ESP8266 (in a module, such as an ESP-12) as a WiFi shield for an Arduino is a little like using the proverbial ‘steam hammer to crack a nut’ - but these modules are frighteningly cheap and I do want a WiFi shield (which are surprisingly expensive).”