I’m using Prometheus to monitor my home office and homelab, I figured it would be cool to have a stack light show the active warnings and alerts from Alertmanager. So I made a HAT (Hardware Attached on Top) for the Raspberry Pi to drive a five-colored stack light.

I made a simple HAT (Hardware Attached on Top) for the Raspberry Pi to read multiple DS18B20 temperature sensors — it was surprisingly easy. I used the measured temperatures to control a fan using Home Assistant.

My twin boys are, like their dad, fascinated by switches and flashing lights. I needed an excuse to use the Raspberry Pi Zero in a project, so I built them a WiFi MQTT controlled alarm module. With a couple of switches, some panel indicators, a buzzer, and a blue LED strobe.

There are a few things we need to do with the Raspberry Pi single-board computer before using it in IoT projects. Here is a short guide of what I typically do, mostly as a reminder to myself — but it might be of use to others as well 🙂 This article assumes that the Raspberry Pi will be headless, so no GUI.

I mounted four Raspberry Pi 3’s in an acrylic stack frame, and used a 5V 20A DIN rail mounted power supply to drive them all.