esp8266 AT command

ESP8266 AT Command Project

Introduction

The ESP8266 is a powerful and cost-effective Wi-Fi module widely used for IoT applications. To streamline communication with the module, I developed an enhanced AT Command firmware that enables serial communication with microcontrollers, allowing easy control over network functions without deep programming knowledge.

Features :

This project provides an extended set of AT commands that allow users to:

• Connect to Wi-Fi networks.
• Retrieve and set IP addresses.
• Send HTTP GET and POST requests.
• Manage files using SPIFFS or LittleFS.
• Adjust baud rate for serial communication.
• Retrieve firmware versions.
• Perform firmware updates over the air (OTA).
• ESP-NOW for direct device-to-device communication.

Getting Started

Hardware Requirements

• ESP8266 module.
• 5V power supply.
• UART interface (e.g., USB-to-Serial converter or MCU with UART support).
• A terminal software like PuTTY or Arduino Serial Monitor.
• connect 5V ---> 5V of Arduino
• connect GND ---> GND of Arduino
• connect TX ---> pin 2 of Arduino
• connect RX ---> pin 3 of Arduino

follow the wiring below

upload the code below to the Arduino then open the Serial Monitor and configure the baud Rate to 9600 and the end message to "NL & CR" then type "AT"

#include <SoftwareSerial.h>
#define RX_PIN 2
#define TX_PIN 3
SoftwareSerial esp(RX_PIN, TX_PIN);
void setup() {
esp.begin(9600);
Serial.begin(9600);
}
void loop() {
if (esp.available() > 0) {
Serial.print((char)esp.read());
}
if (Serial.available() > 0) {
esp.print((char)Serial.read());
}
// put your main code here, to run repeatedly:
}

AT Command List

Here are some of the key AT commands available in this firmware

• AT : Test serial communication.
• AT+RESET : Reboot the module.
• AT+CHECKUPDATE : Check for firmware updates
• AT+UPDATE : Update firmware
• AT+WICON=<SSID>, <PASS> : Connect to a Wi-Fi network
• AT+WIFIP? : Retrieve IP address
• AT+HTGET=<URL> : Send an HTTP GET request
• AT+HTPOST=<URL>, <DATA> : Send an HTTP POST request
• AT+FSWRITE=<FILE>, <DATA> : Write data to a file
• AT+FSREAD=<FILE> :Read data from a file
• AT+MACADDR? :Retrieve MAC address
• AT+NOWSEND=<DATA> : Send data via ESP-NOW

For a full list, check out the official project repository or documentation.

Note: To upload your own ESP8266 code, connect the module to a USB-to-TTL converter and tie G0 to GND before powering the module to enter programming mode.

Applications

• IoT automation
• Smart home projects
• Remote data logging
• Wireless communication between devices

Conclusion

This AT Command firmware extends the functionality of the ESP8266, making it easier to integrate Wi-Fi communication into embedded projects. With support for HTTP requests, file handling, and ESP-NOW, it simplifies IoT development.