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oracid

Eurobricks Knights
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Everything posted by oracid

  1. oracid
    This fits exactly for what I need for my tests. I have already ordered one. Thank you for sharing !
  2. oracid
    The torsion bar solution can be use in simple version without an EV3, like with a Buwizz. My goal was to make something even bigger than this one with 4 servos. As it worked with 2 servos, I decided to make a new video. The previous one is here, https://www.eurobricks.com/forum/index.php?/forums/topic/162059-little-toy-my-first-quadruped-buwizz/&tab=comments#comment-2974337 I hope to make a new one with 4 servos. I am not very good at programming, but I have try to do something like you are talking about. The program was far more complicated and it did not work because in this program I had to use the Block Motor with the Brake parameter on Set position. If you look at my program, you can see I always use the Brake parameter at False. You can't control the servo position without the Brake parameter on Set. Unfortunately, servo has difficulties to reach and to maintain the position. You must know that each leg is 9cm length witch make a big torque. Anyway, I will be very interested if you do something in this way. Please, show me.
  3. oracid
    This kind of quadruped walker has his legs mechanically synchronized and phase shifted. This walker is simple and effective. Unfortunately, it does not fit to turn. The difficulty lies in changing the phase shift, to turn, then reset the phase shift to go straight. To solve this difficulty, I had the idea to use torsion bars fixed between each side motor. In my example, I use 2 symmetrical torsion bars parallel to the motors axis to balance the stresses. By blocking one wheel and rotating the other wheel, the torsion bars forming an helix, the phase shift is changed, the walker rotates. Then, releasing the constraint, the torsion bars automatically return to their original position and the walker goes straight from his new position.
  4. oracid
    May be this can help you.
  5. oracid
    Ok, I find the answer here : https://bricks.stackexchange.com/questions/4309/pass-sensor-or-motor-port-number-as-a-parameter So, the parameter must be numerical and be 1-2-3-4 instead of A-B-C-D. It work's.
  6. oracid
    Does somebody can tell me how I can pass a servo port as a parameter ? As I show here. Thank you.
  7. oracid
    Thank you @imurvai helping me. In my Galaxy A5, I can see in Bluetooth list, the Buwizz and something which is called IDTW213R. I think this last thing is the remote controller but I am not sure. Of course I have read your User Guide 100 times, but unfortunately I did not succeed. When I try to add an event, I press to a joystick of the remote controller, but nothing append. I am 65 year old… May I ask you something ? Can you make a list of things to do as you were talking to a child who is 5 year old. Thank in advance.
  8. oracid
    Unfortunately it does not work. I hope I have bought the right remote controler, http://www.dx.com/p/n1-3017-fashion-multifunction-bluetooth-wireless-game-controller-black-409152#.Wzcf3_ZuKM8 I follow the "BrickController User Guide". When I scan for devices (point 2), BrickController find the Buwizz, but it don't find the remote controler.
  9. oracid
    Thank you @Marxpek, the application is installed. Now I try to make it working, reading the manual.
  10. oracid
    I have copied the file brickcontroller_0_32.apk to the download directory. Then I made a shortcut of this file to my home page. But when I click on the shortcut, it says "application not installed".
  11. oracid
    Thank to you @Marxpek I have got through this point. Hope to day I will go farther.
  12. oracid
    Thank you so much @AkiyamaWataru helping me. I have tried to do the first point, but in my Galaxy A5 with Android 6.0.1, I don't find this parameter, "activate Installation of Apps from unknown Sources"
  13. oracid
    Thank you for your help. I know nothing about this kind of things. Do you mean I have to move the file from my PC to the right directory in my smartphone ?
  14. oracid
    Hi. A big thank you for your work. I have tryed to download the application BrickController with the Play Store, but it don't find it. I have a Samsung Galaxy A5 with Android 6.0.1
  15. oracid
    For this realization of my first quadruped, I was inspired by a modeling made by "trinityscsp" on YouTube. The goal may seem easy to achieve, in reality it is not so easy. The slightest change in the assembly of the beams can cause significant malfunction. Please show me your tests if you make a quadruped of this type with a more effective approach. Of course, this could be done because of the small size of the BuWizz module.
  16. oracid
    Thank you all for support and encouragement.
  17. oracid
    Here is my new tank. This tank is for me an outcome. With 55cm long and 1756g, it will be difficult for me to do better. Beyond its small size, this tank presents 2 originalities. The first is the bearings at the front, on the attack front angle. I thought I had innovated, but it is not so. The Mark I, the first British battle tank (1916) already had this type of bearing at the front. Never mind ... This bearings are intended not to brake or block the track at the time of contact with the step nosing. I consider this improvement as very important, it allows the chassis of the tank to slide on the obstacle. The second innovation concerns this same attack front angle that is mobile and is the main element of the suspension of the tank. To my knowledge, this structure frame never existed, but I remain cautious, the inventions are so innumerable. This innovation is major, it allows to move the main beam of the chassis upwards and thus to clear the bottom of the tank for suspension. This will make a tank climber and fast at the same time such as a Ripsaw. Until now, it was rarely the case, except the size and power of a machine that can pass any obstacle. With these two innovations together and its small size, I hope I have made this tank an original vehicle. I managed to make this tank with a length of 52cm, but the climb was chaotic. Nevertheless, it proves that it is possible.
  18. oracid
    Thanks for all the details.I will consider all this more closely.
  19. oracid
    Here, a variant with a stop of the actuator stroke and top wheels. Like many here, you are a great source of inspiration for me and I will probably reconsider my position on this point.
  20. oracid
    I have made this, it works pretty well. Thank you for your suggestion.
  21. oracid
    Thank you for your comments.Yes, of course, I'm familiar with the limitations of this type of suspension and as you can imagine, I've been studying tank suspensions in Lego videos and books in my possession. - concerning the limitation in height, it is an inconvenience easy to solve with a red piece below which would limit the movement. In addition, it does not seem very complicated to anticipate the problem in the design of his tank. But it is true that a large deflection is to be avoided.- concerning the vertical stability, one could double the passage pieces of the axles so as to increase it and to prevent wobble.- The "swing arm suspension" is a very good solution for ripsaw but unfortunately it takes up a lot of space and limits the number of wheels.- definitely, I do not use the "torsion bar" which takes a lot of space inside the chassis with little advantage.- I made a version with wheels in the upper part as tensor of the track. It works pretty well but beware of shifting the track in the opposite run of the sprocket. My main concern is the number of wheels that must guide the track on its entire course. Thanks again.
  22. oracid
    Here is a video where I show the implementation of a suspension that seems original to me. I have already used this type of vertical suspension in some of my previous videos, but here I searched for a very minimalist solution that implemented very little means and offered great freedom of integration. One of the difficulties was to bypass the 2L space at the track to achieve a gap of 3L at the connection of the suspension. This to facilitate adaptation to the assembly of Lego sets. The small tank has no particular characteristic, it is there only to highlight the implementation of this type of suspension.
  23. oracid
    Things have changed. Now a day, a climber is a stair climber. The difference could be only on the steps that are with nosing or without nosing. Thank you all.
  24. oracid
    As far as I know, I think this is the smallest tank climber. I mean nosing stairs climber of course. And not only Lego.
  25. oracid
    Here is a new very simplified track for which I have draw a new sprocket 47mm diameter. The elasticity of the track can be appreciated as a quality, but also as a defect. For this last reason, I propose a solution approach. This caterpillar is not perfect, but it has a remarkable grip and it allows a concave curve, which is not the case of the Lego track. You can download the stl file here : https://www.thingiverse.com/oracid/designs
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