My kids wanted traffic lights for their LEGO city, so first I had to build a traffic lights controller.
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.
Finding earth leakage on ATTEN 858D hot air gun
My ATTEN 858D hot air gun suddenly began tripping the residual-current device in my home office. Let’s investigate!
Putting flickering LEDs in christmas decoration
Mounting a few orange flickering LEDs in my mom’s miniature elf house Christmas decoration.
Making a WiFi MQTT controlled relay for Home Assistant
Making a single relay controlled with WiFi MQTT from Home Assistant, using WeMos D1 mini board.
Making the Lync status light bigger and brighter
I’m letting my coworkers know my availability with this simple Arduino Uno project. Improved the previous design by adding bigger and brighter LEDs.
Modifying a noisy SOS station kids toy
This SOS station toy used to make terrible sounds. But after a bit of work it doesn’t, it only has LEDs now.
Sticking a LED-strip behind my TV
I’m sticking a LED-strip to the back of my TV to create bias lighting.
Mounting blue emergency LEDs on kids' walking car
My boys like to be firemen, so their red walking car needed some blue emergency lights.
Putting LED lights in a IKEA play kitchen
Installing some lights in Ikea kids play kitchen, using a cheap LED-strip from eBay.
Making a Lync status light
I’m letting my coworkers know my availability with this simple Arduino Uno project. Three LEDs that reflect my Lync status.
Getting started with the AVR microcontroller series
A quick introduction to the AVR microcontroller series with sample schematics of inputs, outputs, serial and some basic circuit drawing.
Car warning lights, with AVR controller
Strobe light controller, using the AVR ATtiny2313 microcontroller. Meant for cars; with front, side and rear warning lights.
AVR car front lights controller
Lights controller for high beams and fog lights on my Subaru. Uses an AVR ATtiny2313 microcontroller.
Making kitchen cabinet LED lights
Two self made LED down-lights, each with four 10mm high-intensity LEDs.
Details In my old apartment, and before LED lights were cheap and everywhere, I build my own LED down-lights and put then in my kitchen cabinet. Two lights, each with four warm-white 10mm high-intensity LEDs, and a simple fuse and switch box. Powered by a 5 V AC adapter.
The LEDs had four chips, making them pretty bright, and they had a wide beam angle.
LCD unit driven by a computer parallel port
Very simple LCD unit with almost no external components, driven directly by a computer printer port.
Emergency LED strobe, AVR controlled
33 high intensity LEDs are controlled with a AVR ATtiny2313 microcontroller. Four flashing patterns that can be set manually or cycle through. Uses an AVR ATtiny2313 microcontroller.
Home power consumption measuring unit, with AVR
Measures the power consumption by counting LED pulses from the home fuse box. Measurements can be read via a serial interface, uses the AVR ATtiny2313 microcontroller.
AVR mood light, 500mA per channel
Turn any RGB LED into a mood light with this controller. Uses an AVR ATmega8 microcontroller.
Light sensor with LED display, AVR controlled
Measures light intensity and shows the value on a LED display, if value passes over/under the set point the output is enabled. Uses the AVR ATmega8 microcontroller.
Wooden 2-post open rack frame
My first “rack” was made of wood. It monitored, meaning displayed and alerted, on some metrics on my Linux server. And controlled a few lights and the alarm system in my room.
I really enjoyed making the computer control the lights.
AVR production line stop alarm
Simple alarm circuit to monitor up to eight inputs, from e.g. production equipment. If any inputs are triggered an alarm is sounded. Uses the AVR AT90S2313 microcontroller.