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

JLCPCB Prototype for $2(Any Color): https://jlcpcb.com

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.

Hardware used:

Stacking Pin headers:
http://y.sudokin.com/4 - 36 pin stacking header for Arduino mega (Ebay DE)
http://y.sudokin.com/7 - 10x 8 pin stacking headers (Ebay DE)
http://y.sudokin.com/5 - Amazon US - Set
http://y.sudokin.com/6 - Amazon UK - Set
http://y.sudokin.com/8 - 36 pin stacking header for Arduino mega (Aliexpress)

Components (LSCS):
http://y.sudokin.com/9 - LCSC BOM(Bill of materials)

Arduino 2560 Mega:
http://y.sudokin.com/a - AliExpress
http://y.sudokin.com/b - Amazon US
http://y.sudokin.com/c - Amazon UK
http://y.sudokin.com/d - Amazon DE

W5100 Ethernet Shield
http://y.sudokin.com/e - AliExpress
http://y.sudokin.com/f - Amazon US
http://y.sudokin.com/g - Amazon UK
http://y.sudokin.com/h - Amazon DE

Soldering station:
http://y.sudokin.com/auss - Amazon US
http://y.sudokin.com/akss - Amazon UK
http://y.sudokin.com/adss - Amazon DE

Software:
PubSubClient Library - https://github.com/knolleary/pubsubclient
Arduino Sketch - https://github.com/dusnoki/arduino-mqtt-21-channel-relay-driver
EasyEDA Project - https://easyeda.com/dusnoki/uln2003-relay-driver

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Thanks for watching, and I hope you learned something ;)