Arduino MQTT Library for SIM800 GSM Modem

Hello tech freaks, hobbyists, enthusiasts and professionals, we are pleased to announce the open source project “SIM800 Arduino MQTT Library“. We welcome you to come and collaborate on this project. MQTT  is an ISO standard publish-subscribe-based messaging protocol for use on top of the TCP/IP protocol (is the underlying technology behind  Facebook Messenger). This MQTT client…

8-Channel Optocoupler Relay board interfacing with Arduino

This blog is intended to help beginners start with interfacing optocoupler relay boards with microcontrollers. We will describe the hardware interfacing of such relay boards with the popular platform Arduino. Sample code is also given below for reference. Optocoupled relay board can be purchased from our online store at ElementzOnline.com Why are optocoupled relays used?…