WiFi 16-Channel Relay Module ESP-12F ESP8266 Dev Board 12V
WiFi 16-Channel Relay Module ESP-12F ESP8266 Dev Board 12V
WiFi 16-Channel Relay Module with ESP-12F (ESP8266) Development Board — 12V DC
Take full control of up to 16 independent circuits wirelessly with this compact yet powerful ESP-12F WiFi 16-Channel Relay Module. Built around the mature and stable ESP8266 ESP-12F chip with a generous 4 MB flash, this board is engineered for makers, engineers, and IoT enthusiasts who need a reliable, expandable relay solution with built-in WiFi connectivity. Made in Mainland China.
Key Features
- ESP-12F WiFi Module On-Board: Mature, stable ESP8266-based module with 4 MB flash — all I/O ports and UART download ports are broken out for easy secondary development.
- 16-Channel Relay Output: Each relay is rated for 24V / 10A switching and is compatible with loads up to AC 250V / DC 30V — suitable for controlling lights, motors, appliances, and more.
- 12V DC Power Supply: The board runs on a standard 12V DC input, making it easy to integrate into existing automation setups.
- Dual 74HC595 Shift Registers: Two cascaded 74HC595 chips handle relay switching efficiently, minimizing GPIO usage. Reference programs for the 595 control logic are provided.
- Arduino & Eclipse IDE Compatible: ESP-12F supports the Arduino IDE and Eclipse development environment — reference sketches are included to get you started quickly.
- Onboard Controls & Indicators: Includes an RST reset button, one programmable button, power indicator LED, relay status LEDs, and a module LED for at-a-glance monitoring.
- Relay Output Terminals (NC / COM / NO): Each channel provides Normally Closed (NC), Common (COM), and Normally Open (NO) terminals for maximum wiring flexibility.
- Easy Programming Interface: Burn firmware via the GND / RX / TX / 3.3V header — simply connect IO0 to GND during download and disconnect after flashing.
Specifications
- WiFi Module: ESP8266 ESP-12F
- Flash Memory: 4 MB
- Number of Relay Channels: 16
- Relay Rating: 24V / 10A (AC 250V / DC 30V max load)
- Power Supply: DC 12V
- Shift Registers: 2× 74HC595 (cascaded)
- EU LVD Voltage: Low voltage — below 50V AC or 75V DC
- High-Concern Chemicals: None
- Color: Green
- Material: Plastic
- Country of Origin: Made in Mainland China
What's in the Box
- 1× ESP-12F WiFi 16-Channel Relay Development Board
Note: Due to lighting and display variation, the actual color may differ slightly from product images. Measurement tolerance: ±1–3 cm.
External Resource
For general guidance on electrical safety standards for relay modules and low-voltage electronics, visit the U.S. Consumer Product Safety Commission (CPSC).
Frequently Asked Questions
Q: What microcontroller does this 16-channel relay module use?
A: This relay module is built around the ESP8266 ESP-12F WiFi module, which features a 32-bit processor and 4 MB of on-board flash memory. It supports development in the Arduino IDE and Eclipse, making it accessible for both beginners and experienced embedded developers.
Q: How are the 16 relay channels controlled?
A: The 16 relay channels are driven by two cascaded 74HC595 shift registers. This approach extends output capability while using minimal GPIO pins on the ESP-12F. Reference control code for the 74HC595 is provided to help you get started immediately.
Q: What loads can I switch with this relay board?
A: Each of the 16 relays is rated at 24V / 10A and can switch loads up to AC 250V or DC 30V. This makes the board suitable for controlling a wide range of devices including lights, solenoid valves, motors, and other electrical appliances within those ratings.
Q: How do I program (flash) the ESP-12F on this board?
A: Connect an external TTL serial adapter to the board's GND, RX, TX, and 3.3V pins (note: RX and TX are crossed between board and adapter). Before initiating the download, pull IO0 to GND to enter flash mode. Once flashing is complete, disconnect IO0 from GND and reset the board using the onboard RST button.
Q: What power supply does this relay module require?
A: The board requires a 12V DC power supply. Ensure your power source can deliver sufficient current for all 16 relays if you plan to switch them simultaneously.