2009/12/1 Martin Pinkston <martinpinks...@gmail.com>: > I was doing some searching on the net for breakout boards and I came across > the Embeddedtronics.com web site. I was looking at the Stepper Breakout, > bare bones board. I have no problem soldering my own components onto a > board. Is there any issues with this route I should be aware of ?
The Opto-isolated version is probably a wise precaution. Do you need any PWM to voltage conversion for driving the spindle motor controller? I think I have seen some that incorporate that. At the end of the day it is just a bunch of wires, I initially bolted a DB25 to the front of the box and ran discrete wires to where they needed to go. Then I realised that was silly and buffered the stepper amp-enable line as asking a single p-port pin to sink quite that much current (4x 8mA) was unwise. I am in the middle of a total rewire now after switching to a Mesa 7i43 (48 IO lines, rather than 16) and I am going to be using ULN2003 (actually ULN2803, which has 8 lines) chips to switch relays and the like. These will sink 500mA to ground when the corresponding input is high, so are not quite a straightforward logic-in / logic-out buffer but are actually beefy enough to control small steppers directly. -- atp ------------------------------------------------------------------------------ Join us December 9, 2009 for the Red Hat Virtual Experience, a free event focused on virtualization and cloud computing. Attend in-depth sessions from your desk. Your couch. Anywhere. http://p.sf.net/sfu/redhat-sfdev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
