※ Note: The ESP8266 has a 3.3V operating voltage. In this guide, 5V is applied to the RX and TX pins of the ESP8266, so the ESP8266 board may be broken. ※ Due to a bug in the WiFiEsp
library, sensor data transmission is possible, but actuator commands can not be received at arduino side.
Arrangements: Arduino, Arduino AC power, ESP8266