My girlfriend wanted a digital calendar on the kitchen wall; I made one with a 24" monitor, a Raspberry Pi and DAKboard.
Stack lights for Alertmanager using Raspberry Pi

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.
Raspberry Pi with DS18B20 temperature sensors

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.
Kids alarm module, Raspberry Pi Zero, and MQTT

A kids alarm module, with buttons and lights. Powered by a Raspberry Pi Zero, connected to WiFi and MQTT.
Getting the Raspberry Pi ready for IoT

A short guide on how to prepare your Raspberry Pi single-board computer for IoT use.
Stacked Raspberry Pi boards, with common power supply

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.