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DIY Smart Doorbell for just $2, no soldering required (frenck.dev)

submitted 5 months ago by [email protected] to c/[email protected]

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[–] Tolstoy 25 points 5 months ago (3 children)

Yeah... 2$ If you have everythingv else on hand and specific circumstances...

[–] [email protected] 28 points 5 months ago (1 children)

Classic carpenter youtube: "Make this $5000 end table for free at home"

Also carpenter youtuber: I'll use this huge piece of mahogany I had on my scrap pile so it cost me nothing.

I also borrowed my friend's 4000 square foot shop, so it was also free."

[–] [email protected] 2 points 5 months ago

I mean...

[–] [email protected] 9 points 5 months ago

Yeah, and they're assuming you're going to power it off of a 5v line. In most instances you'd want to power it off the existing doorbell transformer, so you have to step down the voltage and convert it to DC somehow. That's $5-10 right off the bat.

Additionally, you'd want to have the esp chip and relay at the doorbell transformer, not at the actual doorbell. You'd need to have a second relay or power transformer for this, but that's not a huge deal.

The project would likely be around $10-20, assuming you're not going to 3D print an enclosure. Plus, if you already have a front door camera, chances are you'd already have a doorbell camera that can already do this.

Source: building custom smart devices is my hobby.

[–] [email protected] 0 points 5 months ago

It's the normal way to calculate a BoM.