R/C Servos take a digital pulse input at around 50 (or 100?) Hz. The width of the pulse determines the position of the servo. A width of 1.5 ms is the central position, and 1.0 ms is full left (for example), while 2.0 ms is full right.
if you have digital I/O connected to EMC (parallel port or a pci-card) and a machine that can run with a base_period of 25us that would mean around 40 base_period's for the full range of motion of the servo. Do you need more resolution? Some machines may be able to run with a shorter base_period. There might be an existing PWM HAL component you can use to produce this output, but it's not hard to code your own if you need to. Anders > Hi, > > I am planning to build a robot arm which holds a driller. (it means 6dof > afaik) > > Is there a way to write a configuration to control 3 std. R/C servos > directly? Where do I have to look? The way which seems easy to me is > burning a PIC interface prog which takes parport information and > emulates stepper motors. Is there a direct way? As you can imagine it > will reduce operation speed of machine too much. > > Thanks ------------------------------------------------------------------------------ Register Now for Creativity and Technology (CaT), June 3rd, NYC. CaT is a gathering of tech-side developers & brand creativity professionals. Meet the minds behind Google Creative Lab, Visual Complexity, Processing, & iPhoneDevCamp asthey present alongside digital heavyweights like Barbarian Group, R/GA, & Big Spaceship. http://www.creativitycat.com _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
