ChApTEr 2 ■ hArdwArE for IoT SoluTIonS
Sparkfun WiFi Shield: ESP8266
The Sparkfun WiFi shield, ESP8266, is an interesting board from Sparkfun (http://sparkfun.com/
products/13287). It has the ESP8266 WiFi system on chip (SoC) processor on board, giving a split
personality. Recall from the earlier section on Arduino boards, the ESP8266 WiFi SoC is a programmable
module, but by placing this chip on an Arduino shield layout, it permits you to use the shield as a simple
WiFi connection using the AT command set with an Arduino board. Figure 2-20 shows the Sparkfun WiFi
shield, ESP8266.
Figure 2-19. Arduino