Two channel traffic lights controller — using Wemos

Two channel traffic lights controller — using Wemos

My kids wanted traffic lights for their LEGO city, so first I had to build a traffic lights controller.

Read more →

Stack lights for Alertmanager using Raspberry Pi

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.

Read more →

Raspberry Pi with DS18B20 temperature sensors

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.

Read more →

Kids alarm module, Raspberry Pi Zero, and MQTT

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.
Read more →

Finding earth leakage on ATTEN 858D hot air gun

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!
Read more →

Putting flickering LEDs in christmas decoration

Putting flickering LEDs in christmas decoration
Mounting a few orange flickering LEDs in my mom’s miniature elf house Christmas decoration.
Read more →

Making a WiFi MQTT controlled relay for Home Assistant

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.
Read more →

Making the Lync status light bigger and brighter

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.
Read more →

Modifying a noisy SOS station kids toy

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.
Read more →

Sticking a LED-strip behind my TV

Sticking a LED-strip behind my TV
I’m sticking a LED-strip to the back of my TV to create bias lighting.
Read more →

Mounting blue emergency LEDs on kids' walking car

Mounting blue emergency LEDs on kids' walking car
My boys like to be firemen, so their red walking car needed some blue emergency lights.
Read more →

Putting LED lights in a IKEA play kitchen

Putting LED lights in a IKEA play kitchen
Installing some lights in Ikea kids play kitchen, using a cheap LED-strip from eBay.
Read more →

Replacing front LEDs on RC car

Replacing front LEDs on RC car
Mounting new LED front and fog lights on my brother-in-laws RC car.
Read more →

Making a Lync status light

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.
Read more →

Getting started with the AVR microcontroller series

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.
Read more →

Car warning lights, with AVR controller

Car warning lights, with AVR controller
Strobe light controller, using the AVR ATtiny2313 microcontroller. Meant for cars; with front, side and rear warning lights.
Read more →

AVR car front lights controller

AVR car front lights controller
Lights controller for high beams and fog lights on my Subaru. Uses an AVR ATtiny2313 microcontroller.
Read more →

Making kitchen cabinet LED lights

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.
Read more →

LCD unit driven by a computer parallel port

LCD unit driven by a computer parallel port

Very simple LCD unit with almost no external components, driven directly by a computer printer port.

Read more →

Emergency LED strobe, AVR controlled

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.
Read more →

Home power consumption measuring unit, with AVR

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.

Read more →

AVR mood light, 500mA per channel

AVR mood light, 500mA per channel
Turn any RGB LED into a mood light with this controller. Uses an AVR ATmega8 microcontroller.
Read more →

Light sensor with LED display, AVR controlled

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.
Read more →

Wooden 2-post open rack frame

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.

Read more →

AVR production line stop alarm

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.

Read more →