IoT Button for Door Opening – Part 2

In the previous blog post, I wrote how we built an IoT device to open the office door via Slack. We controlled a relay via a Raspberry Pi to create a short circuit on the intercom’s door opening button. A server on the Raspberry Pi is called via a POST request when someone types “/door open” in our Slack channel.

This solution works perfectly so that everyone can open the door on the mobile phone from the outside of the building. But from the inside, it would be easier to open the door for visitors with a button press. For this reason, I built an IoT button and connected it to our solution.
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