Arduino UNO R3 ESP8266, Manual, Page: 5 / 10

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17) Wireless transmission rate: 110-460800bps.
18) Operating temperature: -40 - +125
4. Using Method
The board is initially by default the firmware which has been programmed to support the AT
command, and the firmware version is v0.9.5.2 AT Firmware.
Open the serial debugging tool, set up it well as the figure shown below, then click to test AT.
Under normal circumstances, the board will return OK to response AT. When Arduino UNO has
been communicated with this board via serial port, testing code is as below.
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void setup() {
Serial.begin(115200);
delay(100);
Serial.println("AT");
delay(5000);
Serial.println("AT+CWMODE=3"); //mode:3 is SerialNet mode STA+AP
delay(5000);
Serial.println("AT+RST"); //reset
delay(5000);
//*****************************change WiFi name
Serial.println("AT+CWSAP=\"xingxing\",\"123456789\",11,0"); //change WiFi name as
xingxing
，
password 123456789
delay(5000);
//*****************************connect to WIFI
// Serial.println("AT+CWJAP=\"xingxing\",\"123456789\""); //connect to wifi
//delay(5000);
//Serial.println("AT+CIFSR"); //inquiry IP