Welcome !

My name is Harm (age 48), and I live in the Netherlands,
together with my girlfriend and our cat Siep.

Technology and problem solving is embedded in my DNA.
Playing with the dad's Philips EE series electronics set and soldering my first circuits at the age of 8,
I've been involved in technology ever since.
With well over 35 years of experience in electronics, of which roughly 25 years of professional experience,
I apply an out of the box no nonsense approach, and always try to solve complex problems with the most simple solutions.


Read more about me below.
Look at some of my projects.
Or contact me for more information.




When I was just a little boy, many many moons ago, I got possessed with the voodoo hocus pocus of electricity.
My dad had a Philips EE2010 electronics set, and together we built the projects in the book.
I think I soldered my first circuit when I was about 8 years old.
So the most obvious choice was to start studying electronics, but that turned out a bit different than expected.

I never liked school. For me learning from books is very difficult.
So instead of doing my homework, I spent most of my time on my many hobbies.
When I was about 20 years old, I decided to quit school and to find a job.

After working as an assistant systems administrator at an art school for several months, I got the opportunity to start working for a laptop manufacturer, repairing the laptop motherboards at a component level. Here I developed my electronic skills even more, troubleshooting complex circuits and soldering tiny SMD components. Within the first year I was the main guy to go to with the more difficult failures. This even lead to becoming a junior product engineer for this same company a few years later.
I've had many different jobs over the years, from testing and troubleshooting x-ray machines to repairing industrial electronics.

But I think I've learned to most at home, spending time with my hobbies.
Not only electronics, but all forms of technology hold my interest, from modern to ancient.
I've made large stunt kites, built and flew RC model airplanes for several years, and I've even made medieval maille armor.
My goal is to learn as many different techniques as possible, so it will help me come up with faster and simpler solutions to complex problems.

The most exiting thing I've learned was the use of PIC microcontrollers.
Already having experience programming, it was not difficult to learn the PIC Basic language. But the possibilities of simply cramming some lines of code into a single chip opened up a whole new world for me.
Now I could make even more complex projects, expanding my interest in robotics.

Want to see more?
Scroll down to my project gallery...



Electronics projects
Other projects
Made an improved version of my previous Raspberry Pi power controller.

Designed for my LinuxBox project

Video available on YouTube.

Modified the previous MSX Turbo PCB as requested on the MSX forum.

This version has only 1 oscillator, and uses the MSX's own clock signal for normal speed.
And it has bigger holes so header connectors can be mounted.

Made a very small light effect module for diorama, and scale model buildings.

It simulates a realistic startup of fluorescent tube lights

Video available on YouTube.

A solid-state turn signal module for older (classic) motorcycles.

Replaces the original turn signal relay.

Video available on YouTube.

Designed a new (complex 4 layer) version of the previous MSX Turbo PCB.

This version has a QFP Z80 CPU already on the board, so the total design is not a high as before, and will fit in almost all models of the MSX computer.

Designed a PCB (Gerber files) for a person on the MSX forum.

This board sits underneath the Z80 CPU, and can be used as a "Turbo" for the MSX computer, running it at almost twice the speed.

Made a MultiGame cartridge for the Atari 2600 that can also support larger games using the bankswitch method.

Using jumpers you can select upto 32 different games, depending on the size of the game.

Video available on YouTube.

An autonomous board for my 6 servo BIPED robot.

This board piggybacks onto the servo controller board, and will guide the robot around obstacles.

Video available on YouTube.

Project iCat.

A cat bed made from an old iMac, but with some funny extra's...

Video available on YouTube.

Made and automatic duration test tool for the Omron R88D-KT series servo drives.
Modified my previously built 4 servo BIPED robot to have 6 servo's for better movement.

I also added an additional servo with ultrasonic sensor for any future autonomous movement.

Still a work in progress, but several video's already available on YouTube.

A custom made LED insert for the tail/brake light of my bobber style motorcycle.
Some I²C components have a different voltage level.
In order to work with these different voltages, you need an I²C level converter.
The Raspberry Pi doesn't have a proper "off" switch.

To switch it On/Off like a normal computer, I made an ATX style power supply for it.

Video available on YouTube.

Got my old Atari 2600 back after many years.

My modern TV couldn't sync with the aerial output, so I modified the Atari to have an AV and S-Video output.

Made a programmer for Xilinx PLD's.

It needs to be connected to the PC's parallal port.

A USB to TTL converter for connecting a microcontroller project to my PC's USB port.
A RS232 to TTL converter for connecting a microcontroller project to my PC's serial port.
A custom made LED insert for the tail/brake light of my classic '73 Triumph Bonneville motorcycle.
A servo controller with 8 servo outputs, for the Lego NXT robot.

The Lego NXT brick uses I²C communication.

4 Servo BIPED robot.

Made from aluminium servo brackets, and my own servo controller.

Video available on YouTube.

Started a robot project and made a 16 servo robot controller with 4 sensor inputs.

It also has an infrared sensor, so the board can also be controlled with an old TV remote control.

Based on my previous SMD wave display, now with 2 colors.

Made for a friend who wanted to mount it to a ceiling fan over his son's bed.
It shows his son's name in yellow, and his birth sign and other symbols in blue.

Found a "wave display" project on the internet, and decided to make an SMD version.

Just a simple project to practice programming, SMD design and SMD soldering.

Video available on YouTube.

The humidity sensor in out bathroom fan wasn't working the way I wanted it to work, so I modified it.
Together with my best friend, we made a fading stars ceiling to hang over the crib of his first born son.

It has 10 LED channels, and a lot of optical fibers.

One servo walking robot.

Built with one old servo, two gears, a microcontroller, and some other junk parts.

Video available on YouTube.

My first "big" project (1991).

A Home made power supply with digital gauges, and a range of
0-30 Volt / 0-4 Amp.



Feel free to contact me (in Dutch or English) if you would like to know more about one of my projects, or if you need help with one of yours.

I will NOT however provide a complete solution for free.
Other than that, I'm always willing to help out.

I'll do my best to get back to you as soon as possible...

Website: https://www.hvandeven.com
Linkedin: harm-van-de-ven-a530a0136
GitHub: hvandeven
YouTube: @hvandeven