Agreed.
On Tue, Mar 11, 2014 at 5:09 PM, Al B <[email protected]> wrote: > Hey Ytai,, > > Your description below says that you used two(2) A4988 Stepper Motor > Driver <http://www.pololu.com/product/1182>. You also indicate that you > are using a 2-cell Lipo battery. However, the stepper driver requires an > minimum operating voltage of 8V so how are you powering those drivers? > Would it be better to use the DRV8834 Low-Voltage Stepper Motor > Driver<http://www.pololu.com/product/2134>instead? > > > > > On Monday, May 14, 2012 12:06:37 AM UTC-7, Ytai wrote: >> >> It should be able to move forward and backwards and turn. I haven't yet >> played around with it enough, but just did some preliminary tests and I'm >> pretty confident it is easy. >> I had a previous attempt for a self-balancer based on continuous standard >> hobby servos. I found that the backlash in the gears is problematic. This >> time around I chose steppers and I'm very pleased with that. They have 200 >> steps / rev times 16 microsteps = 3200 positions / rev. They are very >> torquey without needing gears, so I can direct drive these big 90mm wheels >> with no problem and get high torque and precision. I initially used smaller >> steppers that didn't deliver. Then I bought these two >> beasts<http://www.pololu.com/catalog/product/1200>with these >> drivers <http://www.pololu.com/catalog/product/1182>. The important >> thing was that their voltage rating is low and their current rating is >> high. That means I can connect them to higher voltage and let the driver do >> current limiting, which is what also allows for microstepping. >> Other than that - no specs - that's all the robot: steppers, drivers, >> 2-cell Lipo, IOIO, Nexus S and a kid-size Keens shoe box :) >> >> -- > You received this message because you are subscribed to the Google Groups > "ioio-users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at http://groups.google.com/group/ioio-users. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "ioio-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/ioio-users. For more options, visit https://groups.google.com/d/optout.
