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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DIY Motorized Time-Lapse Camera Slider

I wanted to build a camera slider for time-lapse photography because it enables stunning cinematography. To get a professional equipment, you have to pay many hundreds of euros. But with a few manual skills, an awesome slider can also be built on your own. There are already some solutions and tutorials for different sliders available on the internet – all have advantages and disadvantages. The focus of my design is a robust motorized version that can be disassembled for storage and is not very expensive to build. I tried to make a good combination of purchased parts and building them by myself. An easy controlling and user interface to control the slider was also important for me. For that reason, I developed a solution that can be controlled by a smartphone.
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