Category Archives: Fun

Soldering Boldport Club project “The Matrix”

For the Boldport Club project “The Matrix” I used hot air soldering for the first time. After some experimenting and with help from Boldport Club members, it worked really well. I could colder the 120 LEDs in less than 10 minutes to the board.

I made a video about the process. Please keep in mind, I am new with this process, so this is absolutely no instruction video how things should be done. I may be absolutely wrong. 😀 Enjoy!

Here a list of the objects and tools you can see in the video:

If you have questions, miss some information or just have any feedback, feel free to add a comment below.


SMD LEDs Tests

Today I tested a number of SMD LEDs for the plant watering sensor project. I soldered all 13 LEDs I shortlisted onto a small board and connected it to an Arduino Zero Pro. So I could try the different flashing styles I planed to use more or less automatically. That way I could focus on the LED flashing itself, without being distracted by switching cables.


This is the board I made. Very simple but functional. I used red and blue male header to mark the anode and cathode of the LEDs. There is a sticker on the bottom with the LED numbers on it.


I mounted everything on a very small breadboard and did all connections to the Arduino.

Continue reading SMD LEDs Tests

Outmoded Sequencer Music Demo

For the demo video in my previous post, I did not really choose nice melodies. So I created a small composition using the outmoded sequencer:

For this music I connected the outmoded sequencer directly, after the potentiometer for the volume control, to an audio interface. Now I recorded the sound of the sequencer while I changed the matrix. After recording I added additional elements, like the percussion and bass lines.


Boldport “The Cuttle” Arrived

Today the new project from Boldport Club arrived. It is called “The Cuttle” and it is a minimal configuration of the ATMega328-PU microcontroller with minimal elements to get it running.

As usual the PCB is artfully designed in shape of a cuttlefish. Soldering was easy this time.

Here some photos of the project how it arrived and at the end the final version with all components soldered into place.

I also made a short video where you see the ATMega in action:

The source code for the LED effect shown in the video is very simple:

void setup() {
  DDRD = 0xff;
  PORTD = 0x0f;
void loop() {
  const uint8_t first = ((PORTD & 0x80) != 0) ? 1 : 0;
  PORTD = ((PORTD << 1) | first);