thank you, the motor controller i use is the Pololu G2 High-Power Motor Driver 24v21 https://www.pololu.com/product/2995
Am Freitag, 23. September 2016 15:26:47 UTC+2 schrieb Charles Steinkuehler: > > On 9/23/2016 8:08 AM, Sag ich Dir nich wrote: > > so you said i may need to add a pull-up resistor so i searched in the > web and > > read sometimes they use 10k, sometimes 15k, sometimes 5k and everything > in > > between (some say can be between 100 ohm and 100k ohm). How do i > calculate the > > correct resistor value? Or is there a known working value for this? > > It depends on things like the the drive capability of the output > (which is very high in this case, since the FETs were designed to > drive heaters and fans), the input impedance and capacitance of your > motor controller and the wiring, and the time constants involved (ie: > how fast or slow you need the signal to rise). > > Unless you have an unusual case, the specific value of resistor you > use doesn't really matter a lot. For a 5V signal, I'd suggest > something between 1K and 10K...just use what you have handy. If you > have a range of values available or need to purchase something, I'd > probably start with 3.3K or a nearby value (2.2K to 4.7K). > > Even better, if you provide details about the motor control you are > using, I can review the specifications and perhaps recommend a real > solution (the pull-up resistor is just a guess, but it shouldn't hurt > anything to add). > > -- > Charles Steinkuehler > cha...@steinkuehler.net <javascript:> > -- website: http://www.machinekit.io blog: http://blog.machinekit.io github: https://github.com/machinekit --- You received this message because you are subscribed to the Google Groups "Machinekit" group. To unsubscribe from this group and stop receiving emails from it, send an email to machinekit+unsubscr...@googlegroups.com. Visit this group at https://groups.google.com/group/machinekit. For more options, visit https://groups.google.com/d/optout.
