Why to use relay boards The board can be used or IoT applications which involve switching devices as primary application. The relay board has the wifi on board so it will minimize the number of wires in your IoT project. Total 8 GPIOs are used for controlling 8 relays. The unused pins are soldered to headers and kept open for other applications and connecting different sensors. The basic pin diagram of NodeMCU can be found below under the documentation link.

NodeMCU can be programmed using Arduino as well. Use this relay board and make your IoT simpler and compact like never before

The application can be developed using MIT app inventor and google firebase or Android Studio. MIT app inventor Android studio

Specifications

• Compact form factor (Just 10cm X 10cm).
• Relays rated for 10A.
• Unused GPIOs are open for developers.
• Rx, Tx headers for connecting to Arduino.
• Separate COM, N/C, N/O for each relay.
• You can use your own NodeMCU board.
• Toshiba Optoisolator for reliability.
• Each module is tested after soldering.
• Separate LED for indication of relay ON/OFF.
• Requires external supply for relay (~9V DC is fine).
• Onboard regulator AMS1117 (for getting fixed 5V going as Vin to NodeMCU.)

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