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Lesson 35: Get Started with ESP8266 Module

The ESP8266 module that comes with the kit is already pre-burned with AT firmware, but you still need to modify its configuration by following the steps below.

Build the circuit.

Note

To ensure the ESP8266 gets a stable voltage, please connect it to an external power source like the 9V battery that comes with the kit, by hooking it up to the Uno board.
Open the .ino file under the path of universal-maker-sensor-kit\arduino_uno\Lesson_35_ESP8266. Or copy this code into Arduino IDE. And upload the code.

The code establishes a software serial communication using Arduino’s SoftwareSerial library, allowing the Arduino to communicate with the ESP8266 module through its digital pins 2 and 3 (as Rx and Tx). It checks for data transfer between them, forwarding received messages from one to the other at a baud rate of 115200. With this code, you can use the Arduino’s serial monitor to send AT firmware commands to the ESP8266 module and receive its responses.
```
#include <SoftwareSerial.h>
SoftwareSerial espSerial(2, 3); //Rx,Tx

void setup() {
    // put your setup code here, to run once:
    Serial.begin(115200);
    espSerial.begin(115200);
}

void loop() {
    if (espSerial.available()) {
        Serial.write(espSerial.read());
    }
    if (Serial.available()) {
        espSerial.write(Serial.read());
    }
}
```
Click the magnifying glass icon (Serial Monitor) in the upper right corner and set the baud rate to 115200. (You may have some printed information like me, or you may not, it doesn’t matter, just go to the next step.)
Warning
- If ready doesn’t appear, you can try to reset the ESP8266 module(connect RST to GND) and re-open the Serial Monitor.
- In addition, if the result is OK, you may need to re-burn the firmware, please refer to How to re-burn the AT firmware for ESP8266 module? for details. If you still can’t solve it, please take a screenshot of the serial monitor and send it to service@sunfounder.com, we will help you solve the problem as soon as possible.
Click on NEWLINE DROPDOWN BOX, select both NL & CR in the drop down option, enter AT, if it returns OK, it means ESP8266 has successfully established connection with R4 board.
Enter AT+CWMODE=3 and the managed mode will be changed to Station and AP coexistence.

Reference

ESP8266 AT Instruction Set