Relay Driver Board, 21 Channels, 12V, Arduino 2560 shield, Node Red, MQTT, W5100 Ethernet

In this video I will continue with my home automation system. I created a 21 channel 12v relay driver board shield for an arduino mega 2560. It uses the same MQTT broker and Node Red server that are setup on my raspberry pi from my previous video. It also uses the w5100 ethernet shield for connecting to the home network and the MQTT broker.
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EasyEDA Project
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Screenshot (268).png

Original link: https://youtu.be/ZOzFaQZjA94

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PubSubClient Library
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