ESP8266 ESP-12F 4 Channel Wifi IoT Smart Switch

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The ESP-12F WiFi 4-Channel Relay Module is a highly integrated solution for smart home automation and IoT applications. Built on the reliable ESP8266 ESP-12F WiFi module, this relay board enables wireless control of up to four AC or DC loads via mobile apps or microcontroller-based systems. Designed with a robust AC-DC power module and secondary development in mind, it supports Arduino IDE, ECLIPSE, and other development platforms.

Key Features 

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• Built-in stable ESP-12F WiFi module with 4MB flash memory.
• All GPIO and UART ports are broken out for easy secondary development.
• Wide power input support: AC 90–250V / DC 7–30V / 5V.
• Onboard reset button for the ESP module.
• Compatible with Arduino IDE, ECLIPSE, and other development tools.
• 4-channel 5V relays support up to AC250V or DC30V switching.
• Onboard power LED, programmable LED, and relay status indicators.

Technical Specifications:

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Parameter	Specification
AC Power Supply	90–250V
DC Power Supply	7–30V or 5V
WiFi Module	Built-in ESP-12F with 4MB Flash Memory
I/O and UART Access	All ports are accessible via headers
Power Supply Module	Onboard AC-DC switching module
Development Support	Compatible with Arduino IDE
Relay Output	5V relays control AC/DC loads up to 10A
Indicators	Power LED, 1 programmable LED, relay indicators
Board Dimensions	93mm × 88mm

Interface Description

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Programming Port:

• Connect GND, RX, TX, and 5V of ESP8266 to external TTL serial port (GND to GND, TX to RX, RX to TX, 5V to 5V)
• Connect IO0 to GND during programming, then disconnect after upload

Relay Output:

• NC (Normally Closed): Connected to COM before relay activation
• COM (Common): Relay common terminal
• NO (Normally Open): Connected to COM after relay activation

GPIO Pinout:

• All standard GPIOs of ESP8266 are accessible via headers for custom functionality or sensor integration

Program Download Guide

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• Connect IO0 to GND using jumper wires or caps
• Use a TTL-to-USB adapter (e.g., FT232) and connect to PC
• Connect to the board: GND↔GND, TX↔RX, RX↔TX, 5V↔5V
• Select the correct COM port and board type in Arduino IDE
• Click "Upload"; the code will compile and transfer to the board
• After upload, disconnect IO0 from GND and reset the board

Applications

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• Smart home device control
• Wireless industrial automation
• IoT-based switching systems
• Remote ON/OFF control
• Security and access automation
• Smart farming systems

Packaging Details

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• 1 X ESP8266 ESP-12F 4 Channel Wifi IoT Smart Switch

Why Choose This ESP8266 ESP-12F 4 Channel Wifi IoT Smart Switch?

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Perfect for smart home, IoT devices, and automation systems. With wide voltage support, Arduino compatibility, and 4-channel control, it's a reliable and scalable choice for developers and enthusiasts in Bangladesh.