Updates

• 
  Robert Klingberg joined the group U.S.A Sbrick Fans

  • October 25, 2016
• 
  Robert Klingberg posted a topic in the forum Support:

  SBrick PWM Output

  Hello, in using SBrick and working to develop add-ons for Power Functions, I have noticed the PWM output coming from SBrick for motors is not normal (verified using an oscilloscope).  Normal PWM looks smooth and rises and falls from 0V to max...  moreHello, in using SBrick and working to develop add-ons for Power Functions, I have noticed the PWM output coming from SBrick for motors is not normal (verified using an oscilloscope).  Normal PWM looks smooth and rises and falls from 0V to max voltage and back again.
  With SBrick, this is how the PWM operates when there is no motor connected.  However, when there is a motor connected to any port, the PWM signals on that port become very irregular.  The irregularities vary depending on which type of motor is connected, so an M-Motor will cause less irregularity than an XL-Motor for example.
  I did research into this and also spoke with Texas Instruments, maker of the H-Bridge chips SBrick uses to control outputs, and it seems this behavior may be caused by the fact that you did not implement any current sense resistors on the H-Bridges in your design. TI illustrates the use of current sense resistors connected to pins 1 and 4 of the chip (AISEN and BISEN), yet you have these pins...    less

  • October 25, 2016
• 
  Robert Klingberg commented on Jerome Egli's album.

  • January 16, 2015

  • juerg siegenthaler and Lénárd Pásztor like this.
  • View all 6 comments
  • 
    Robert Klingberg Did you need to modify the switch by removing the tab/spring, or is this an unmodified switch?

    • January 16, 2015
  • 
    Jerome Egli Hi Robert, I tried both. Onetime with modification and one time without. The solution without modification (original) worked better with this method. The Medium-Motor was enough powerful. The Version with modification (modified tab/spring) did not close...  moreHi Robert, I tried both. Onetime with modification and one time without. The solution without modification (original) worked better with this method. The Medium-Motor was enough powerful. The Version with modification (modified tab/spring) did not close the switch properly. I will surely do some more tests (probably with a servo Motor). But at the Moment it seems that this is quite a nice possibility for rempote controlled Switches which does not need a lot of parts (e.g. no gears).  

    • January 16, 2015
  • 
    Robert Klingberg Thanks for the additional detail, Jerome. The fact that you got it working without modification is great!

    • January 16, 2015
  • 
    Jerome Egli I just saw at lego.com that the m-Motor is sold out... :-(

    • January 19, 2015
  • 
    juerg siegenthaler Versuchsmal hier: http://shop.educatec.ch/legoeducationaldivision/ergaenzungssortiment/legoelektrischeelemente/index.php
    Die haben ein riesen Lager mit M Motoren
    
    Look at:...  moreVersuchsmal hier: http://shop.educatec.ch/legoeducationaldivision/ergaenzungssortiment/legoelektrischeelemente/index.php
    Die haben ein riesen Lager mit M Motoren
    
    Look at: http://shop.educatec.ch/legoeducationaldivision/ergaenzungssortiment/legoelektrischeelemente/index.php  

    • January 28, 2015
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  Robert Klingberg has just signed up. Say hello!

  • January 16, 2015