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.
