NodeMCU based 8 relay board for Internet of Things (IoT applications)
What is NodeMCU?? Detailed information about this can be found at https://nodemcu.readthedocs.io/en/master/. Basically it is an IoT board at very (!) cheap price. 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 male headers and kept open for other applications and connecting different sensors. The basic pin diagram of NodeMCU can be found at [NodeMCU documentation]--- https://nodemcu.readthedocs.io/en/master/ NodeMCU can be programmed using Arduino as well . Download Arduino IDE first. Connect NodeMCU using the micro usb cable. Install drivers for CH340G or CP2102 (depending on the controller on your NodeMCU). In the boards manager (Arduino IDE) use this URL. http://arduino.esp8266.com/stable/package_esp8266