The Keyestudio (tm) Relay Shield model ks-0212 provides four independently controllable relays on a Raspberry Pi expansion hat, complete with convenient screw terminals. Its the nicest relay board Iā€™m personally aware of.

KEYESTUDIO is a trademark of Shenzhen KEYES DIY Robot co., Ltd.

Hardware Links:

Board Manufacturer Store:

https://www.keyestudio.com/keyestudio-rpi-4channel-relay-5v-shield-for-raspberry-pi-ce-certification-p0475-p0475.html

Board Manufacturer Wiki:

https://wiki.keyestudio.com/index.php/KS0212_keyestudio_RPI_4-channel_Relay_Shield

Links for the Songle SRD-05VDC-SL-C relay used on the board:

http://www.songlerelay.com/Product_show_id_539.htm

http://www.songlerelay.com/Public/Uploads/20161104/581c81ac16e36.pdf

Spring City Solutions Links:

Spring City Solutions Node-RED project page:

https://www.springcitysolutions.com/nodered

Spring City Solutions page for this node:

https://www.springcitysolutions.com/nodered-keyestudio-relay-shield

Spring City Solutions Node-RED project email:

nodered@springcitysolutions.com

Spring City Solutions Gitlab for this node:

https://gitlab.com/SpringCitySolutionsLLC/keyestudio-relay-shield-ks0212

Patreon Page:

https://www.patreon.com/springcitysolutions_nodered

Software Links:

Spring City Solutions Gitlab for this node:

https://gitlab.com/SpringCitySolutionsLLC/keyestudio-relay-shield-ks0212

npmjs for this node:

https://npmjs.org/package/node-red-contrib-keyestudio-relay-shield-ks0212

Node-RED flows for this node:

https://flows.nodered.org/node/node-red-contrib-keyestudio-relay-shield-ks0212

Documentation Links:

Gitlab wiki for this node (the master copy of list of links is here):

https://gitlab.com/SpringCitySolutionsLLC/keyestudio-relay-shield-ks0212/-/wikis/home

Youtube video "How to set up":

https://youtu.be/VkkeTJV-4gc

Youtube video "How to use":

https://youtu.be/iC77coWWsT0

Youtube video "Testing Results":

https://youtu.be/5Al1RFTqQQM

Trademarks:

KEYESTUDIO is a registered trademark of Shenzhen KEYES DIY Robot co., Ltd.

Raspberry Pi is a trademark of Raspberry Pi Trading

Node-RED and node.js are a trademark of the OpenJS Foundation in the United States

Python is a registered trademark of the Python Software Foundation.

Songle is a trademark of Zhejiang Songle Machinery Co., Ltd. Wenling City,Zhejiang CHINA

Peakmeter is a trademark of Shenzhen New Huayi Instrument Co., Ltd.

Rigol is a trademark of RIGOL TECHNOLOGIES CO., LTD.

"All trademarks are property of their respective owners"

Copyrights and Licenses:

Majority of code Copyright (c) 2020-2021 Spring City Solutions LLC and other contributors and licensed under the Apache License, Version 2.0

NRGPIO.PY Copyright JS Foundation and other contributors and licensed under Apache License, Version 2.0

Icon made from http://www.onlinewebfonts.com/icon aka Icon Fonts is licensed by CC BY 3.0