Eurobricks Citizen
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  1. @nico71 thanks for the explanation :). It's great to see ideas 'outside of the box' like this!
  2. Beautiful. Some interesting functions while still looking nice. Could you explain this a bit more please? I would think that the distance of the wheels to the centre of turning is irrelevant, as long as their axes pass through it? Does this type of steering exist on any real world vehicles?
  3. Yesss. Great news! This should make controlling many motors much easier than with the Powered Up remote. Also the proportional control looks really nice.
  4. Simply plotted some 10*10mm squares and measured them. Backlash is approximately how far undersized the squares are.
  5. 88010 remote control connected directly to the hub with the program loaded on it gives no noticeable lag for me.
  6. Nice! I originally planned to build a CoreXY style plotter but figured out other ways to mount the motors remotely, so went with that. Hopefully we can see yours in action soon.
  7. It's just made of liftarms connected together. In order for the cracks to not show up on the plot I used thicker than usual paper - 200gsm seemed to work well.
  8. It also appears that YouTube promotes content with catchy thumbnails and that viewers are unlikely to skip through - both of which might be seen unfavourably by the algorithm for Sariel. It's unfortunate because he has some quality content, and I often refer to his reviews for technical details of sets/pieces.
  9. Indeed, it's a pretty nice sensor! I had initially thought it was just a touch sensor. I wonder what other novel uses it may have... ­čĄö
  10. Apologies for the late reply. I don't think so. I think a spring just creates a constant opposing force that does nothing to change the friction that must be overcome. The internal friction of the cylinder is what I think is the problem. True, I have changed to a large cylinder (levered onto the force sensor) and it seems slightly better. Still, there is a large drop in pressure before a change is detected. This is the best I could come up with: Interesting, thanks for sharing!
  11. Hm, it looks awfully similar to my plotter design: This is basically how I did it @Knight3, except with a Robot Inventor hub rather than EV3. There is a lot of detail in the WIP thread here (including the python program I wrote in pybricks): I highly recommend the command-line tool "vpype" and a plugin for it called "vpype-gcode". They are purpose built for plotter vector graphics, and with them you can convert´╗┐´╗┐´╗┐´╗┐´╗┐ any .svg file ´╗┐into gcode, which you then just paste into a program and run it (feel free to use/copy mine).
  12. Wow, so good! Love the camera angle looking at the side of the loop.
  13. Sadly, things are not this simple. I believe the internal friction of Lego cylinders prevents accurate readings, at least in both directions. With this setup, while increasing the pressure, I could obtain fairly accurate readings. However, once I then decreased the pressure, it would take a drop of about 0.8 bar before any change was detected by the force sensor. I think this is simply due to the static pressure (EDIT: static friction) that has to be overcome to move the cylinder. I also tried using a battery box to gauge the pressure. It works, in an on-off fashion, but needs a similar drop in pressure before it falls back down (which isn't necessarily a bad thing for a simple compressor). My hopes of building a fine-tunable compressor are dashed. I probably won't revisit the OP concept, as I don't like the idea of constantly having to run a motor to check the pressure. At least, the SPIKE force sensor can be used as an on-off pressure switch (with on and off points ~0.8bar apart), so this is what I'll use going forward.
  14. Thanks for sharing. It's a smart solution you have come up with to operate many cylinders with just 2 motors. Someone has used the battery weight mechanically with the old switch: https://rebrickable.com/mocs/MOC-113088/olivierz/pneumatic-pressure-controller/#details I don't think it's crazy to use the gyro. In fact, I think it could give accurate readings. The downside I think is that it would always have to be on a flat surface (due to gravity), whereas a force sensor could be put anywhere.