2 Channel Wi-Fi Relay Module Using ESP8266 NodeMCU

The project described here is an ESP8266 NodeMCU Two Channel Relay Module. This board enables users to control 2 x relays remotely. The 2 channels can be controlled remotely using a webserver/WiFi connection. The project works with 5V_DC. Two LEDs indicate relay operation. Screw terminals help user to connect devices and power the supply. Relay output has 3 contacts normally closed, normally open, and common. Relay can drive a load up to 10A/250V_AC or 10A/30V_DC. It can be used in applications such as IoT and smart Home/Home automation.

The board can be connected to a server through a TCP Client and also can be controlled by HTTP. With this module, users can upload firmware and can create a versatile IoT project. It is suitable for your smart home and IoT project with network control.

More details about the software and code are available here:

• https://randomnerdtutorials.com/esp8266-relay-module-ac-web-server/
• https://www.easyelectronics.in/index.php?route=product/product&product_id=152

Hardware Details

• ESP8266 MCUNODE (WiFi)
• 2 x 5V Relay
• 2 x LEDs Relay Operations
• 2 x 3 Pin Screw Terminals (Relay Output Normally Open, Normally Closed and Common Connections)
• 2 Pin Screw Terminal Power Input 5V DC
• 2 x BJT (Transistors) drive relays
• 2 x Flyback diodes
• ESP8266 GPIO15 Connected to Relay 1
• ESP8266 GPIO13 Connected to Relay 2

Features

• Power Supply 5V DC
• Current 100mA (when Relays are on)
• 2 x Relay LED
• 4 x 3MM Mounting Holes
• Screw Terminal for Easy Connections
• PCB Dimensions 57.63 x 53.98 mm

Connections and Other Details

• CN1 Power Supply: Pin 1 = 5V DC, Pin 2 = GND
• CN2: Pin 1 Normally Closed, Pin 2 = Common, Pin 3 = Normally Open (Relay 1 Contacts)
• CN3: Pin 1 Normally Closed, Pin 2 = Common, Pin 3 = Normally Open (Relay 2 Contacts)
• D2: LED for Relay 1
• D4: LED for Relay 2

Schematic

Parts List

Connections

Gerber View

Photos

ESP8266 NodeMCU Datasheet

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