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ESP8266 ESP-12E UART WIFI Wireless Shield TTL Converter for Arduino UNO R3 Mega – ASA College: Florida
esp8266 expansion board extends the gpio wifi shield
Arduino WiFi Shield | Arduino Documentation
Arduino-WiFi-Shield | Hackaday.io
Getting Started with the Arduino WiFi Shield | Arduino Documentation
Overview | Adafruit WINC1500 WiFi Shield for Arduino | Adafruit Learning System