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Considering you don't actually check who the person is, wouldn't it be easier to just leave the door unlocked during business hours? KISS and all that...
It's an email alert - but it'd obviously be trivial to connect up the slack API to pass the message + image to a channel.
So wait a sec, do you open the door to anyone without checking who is it?
https://github.com/calltracking/doorbell
It's not the most beautiful thing, but it gets the job done of letting us know when someone is at any of our 3 doors.
Did you hack it or just integrate to it?
> How we automated our office doorbell using 3 products already available.
Wrong usage of the word 'hacked' in the original title.
A more hacky way to do it, would have been getting a voice modem dongle that takes SIM cards, and writing software directly to detect/answer the incoming call, verify it's the doorbell, post to slack and wait for auth., then play a WAV back out through the dongle (like a voicemail greeting). Same result, less dependence on 3rd party services, learn a lot in the process.
It's all well and good using 3rd party services if they are available, but sometimes these articles are akin to me writing a post on 'how I found something on the internet using google'.