Eurobricks Citizen
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About Jonas

  • Birthday 01/25/1957

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  1. If I remember well, one of the key circuits was damaged during my HW experiments in 1990s. I switched to PCs in my professional work and to embedded systems (like Arduino) in my hobby. See here.
  2. Hi Thorsten, thanks for your warm response. And yes, it was so nice times with old good Speccys, I had built my interface in 1988. I have no schematic anymore, but I still remember that I used integrated stereo amplifiers to make small-footprint H-bridge drivers for motors. My programs were written mainly in Basic but the time-critical parts, such as controlling motors with opto-sensor feedback or joystick control, were coded in Z80 assembler. BTW, I had built also another interface with 8-bit AD and DA converters and used it for my experiments in those early times of speech recognition. A large part of my dissertation in 1980s was made on my Spectrum. Unfortunately, the computer does not function anymore. But it still has a place of honor in my private exhibition.
  3. A sweet topic for us, older Technic and computer fans! It reminds me my attempts to link the Lego and ZX Spectrum worlds back in late 1980s. I was lucky to have had the Spectrum+ version whose larger case allowed me to build in a 3-port parallel interface (8255) and additional memory banks. I have also designed and built an interface for controlling LEGO models (up to 4 motors, 8 LEDs and 4 photodiodes used for feedback control). Here are several pictures: It allowed me to control various manipulators ... ... and also vehicles (via a joystick connected to the parallel interface as well). Some other pictures can be seen on my Brickshelf.
  4. If only the TLG would come with a Technic-compatible nut. The only available brick-type nut is not well suited for Technic constructions.
  5. Super! It is nice to see that somebody was able to recreate this Akiyuki's masterpiece. I would appreciate some more detailed photos.
  6. For me, the most sophisticated pneumatic contraption is Pneumatic Ball Factory by Quanix. He made at least 3 versions. Here is the last one:
  7. This looks like a very interesting and - at the same time - space-friendly GBC module.
  8. Thank you David for this useful hint. Also thanks to Jos for his one.
  9. Hello all, I have a question on using memory in EV3. I want to run a program in two modes. In the first one, I am going to do some calibration based on measurements from sensors and computation, and after that to store the computed values. This should be done only occasionally, especially in case when the working environment changes. In the main mode, the program should retrieve those stored values and use them for its repeated runs. What is the best way to do it in Pybricks?
  10. This is a very clever design. Thank you very much for providing the sketch of the main linkage and the file. I have just build a pair of legs to learn how it works. I admire your creative solution to these three 2.5-stud-long arms.
  11. I like the new type of gripper. It seems to be well suited for small elements.
  12. This is a real masterpiece of Lego construction and programming.
  13. Jonas

    [MOC] RC Balaton Ferry

    It is a really nice and well designed creation. It must be a great attraction for visitors of any Lego convention.
  14. Again, you have created a wonderful machine. A nice inspiration for some of us, including me.