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Detailed Description:

The RM04 WiFi Serial Module is a compact wireless networking solution that converts UART/TTL data into WiFi signals, allowing microcontroller-based systems to connect wirelessly to networks or communicate with PCs, smartphones, or other WiFi-enabled devices. It supports both Station (STA) and Access Point (AP) modes and offers a web-based configuration interface for easy setup.

This module is widely used in home automation, IoT, sensor networks, wireless serial communication, and remote device monitoring. It can act as a transparent serial bridge, allowing microcontrollers to send/receive data wirelessly without heavy WiFi stack coding.

Key Features:

• Converts UART serial communication to WiFi

• Supports both AP (Access Point) and STA (Station) modes

• Built-in web configuration interface via browser

• Compatible with 3.3V logic level microcontrollers

• Supports TCP, UDP, DHCP, HTTP protocols

• Can act as TCP server, TCP client, or UDP peer

• Transparent data transmission mode (like serial over WiFi)

• Compact and lightweight design

• Firmware upgradeable via network

Technical Specifications:

How to Use:

1. Power the module with a stable 3.3V power source.

2. Connect TX and RX pins to your microcontroller (use 3.3V logic).

3. Connect to the module’s WiFi network (AP mode) or connect it to your router (STA mode) using a browser.

4. Access the web config at 192.168.1.1 or 192.168.4.1 (default).

5. Set parameters like Baud Rate, WiFi mode, SSID, and Password.

6. Use as a serial-to-WiFi bridge for wireless data transmission.

Use level shifters if your MCU uses 5V logic to avoid damaging the module.

Applications:

• Wireless IoT data transmission

• Home automation & smart devices

• Wireless sensor networks

• Remote serial device monitoring

• RS232/TTL to WiFi interface bridge

• Industrial control systems

• ESP/Arduino-based wireless control systems

• Remote debugging via serial port

Package Includes:

• 1 x RM04 UART to WiFi Serial Module