I can see using the para port as a safty measure. But even then I should be using some type of isolation just to be safe?
I will not have to worry about trying 3 phase. so is it possible to use 1 phase of that 3 phase set-up? I did not know what was exactly involved with tieing the h bridge to the pwm output, but I was not sure, and am still not exactly how that works. I will look into using my little Arduino as my break out board and fool with getting a h bridge going with that guy first. ________________________________ From: Peter C. Wallace <[email protected]> To: Enhanced Machine Controller (EMC) <[email protected]> Sent: Thursday, August 20, 2009 5:17:34 PM Subject: Re: [Emc-users] Mesa io card driving h bridge and counting encoders > Subject: [Emc-users] Mesa io card driving h bridge and counting encoders > > I am building a few machines currently. They are all smaller bench type > machines at this current time. > > > My main question is, can I drive an h bridge from the mesa. Can I count the > encoder directly from the board? (sorry about the first email, hit the wrong key) Yes, you can with some limitations, the PWM output on the Mesa cards is simple PWM, it does not have direct MOSFET drive signals so you would have to create the high and low side MOSFET drive signals and the deadzone timer in your HBridge design. The three phase PWM generator does have high and low side drive and deadzone timers but a three phase drive is probably not a good beginner project :-) You can also count TTL encoder signals directly with the FPGA board. But... I think Rays suggestion of using a parallel port (or multiple ports) is a better starting point. If you use the bare FPGA card signals to drive a home-made HBridge, you risk damaging the expensive FPGA card instead of a $15.00 parallel port card. EMC2 can generate PWM and count encoders and verify your hardware. Once your external hardware is working and you have run into the limitations of the parallel port, then a FPGA card would be a good upgrade option. Peter Wallace Mesa Electronics (\__/) (='.'=) This is Bunny. Copy and paste bunny into your (")_(") signature to help him gain world domination. ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
