Show HN: I built an app to use a QR code as my doorbell

I didn’t have a doorbell before (multiple reasons) and my house feels unwelcoming without one. So I built a doorbell app that uses a QR code - visitors scan the QR code to ring the doorbell and I get notified on my phone.

Here is an example of the QR code I have on my door. You can scan it and say hello: https://www.thebacklog.net/img/2024/10/show-hn.png

This was also a great excuse to build my first app for

6mo | Hacker news
Ask HN: Can Calculus be taught without differentiating or integrating by hand?

Maybe the focus could be on solving Calculus problems with the help of a symbolic algebra system instead?


Comments URL: https://news.ycombinator.com/item?id=41978235

Points: 11

# Comments: 10

https://news.ycombinator.com/item?id=41978235

6mo | Hacker news

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