×

With the recent surge in Omicron cases, shipping may be slower than stated times. We are working to build, ship and respond to everything as quickly as possible. Please see all COVID-19 updates here. Thank you for your continued support.

avatar

Cyrus Harding

Member Since: February 24, 2009

Country: United States

  • Looks like a nice controller. Industrial products with similar capability cost $100 or more. Hard to believe that people can complain about a $34 price tag.

    Two comments: I have not tried one of these boards but I have purchased three for a new project. It took me some time to realize that although the Dspin chip has "micro-stepping", it only stops on full steps. I wish that was clearer on this page.

    It is unclear how to initially set the Kval parameters for a particular motor. This equation is in the data sheet:KVAL = ((KVAL_X + BEMF _COMP)× VSCOMP×K _ THERM)×microstep

    I still don't see how to relate a motors current rating to the KVAL setting!

    Seems like the only way is figure the voltage (VOUT = VS ⋅KVAL) and use Ohms law to figure the current based on the winding resistance.

    Seems like folks are likely to smoke their motors without knowing a specific way to come up with the right setting.

    I'll make a spreadsheet to come up with the four Kval parameters then try it out on a couple of motors.

    Anyone else figured this out? Thanks, Craig

No public wish lists :(