Great project video with thorough details sent in by Alex. They write:
Using a NodeMCU, a micro servo, and 3D printing, I created an Alexa enabled
light switch that can be used to turn any “dumb” light switch into a “smart”
device, without needing to modify the wiring in your home. The project runs
off of a pack of AA batteries and is compatible with any device that
integrates Amazon’s Alexa voice assistant. Code and 3D print files are
available in the project’s video description. This is a fun maker project
to get people into DIY home automation, and is good for integrating home
automation into older homes where rewiring light switches, etc. may not be
possible or difficult.
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