Robot using already existing servo amplifiers

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23 Jul 2014 06:52 #49039 by andypugh

If you remember I also need a bit to open each channel.


I think you can take the sel0, sel1, sel2 signals out through parport pins to activate each axis in turn.
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29 Jul 2014 14:03 #49242 by dimech
Andy your idea with self-driving muxes was brilliant (it took me almost a month to figure it) and works :)


Now I think I have another problem!

I made all the trials, clocking (PIN 16 continuous clock) from the old cpu because it looked easier than load a realtime HAL comp.
But I noticed that this clock is 2 MHz i.e. 500ns. My jitter is approximately 14.000ns. I think I cannot generate this clock.

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29 Jul 2014 15:20 #49245 by andypugh

made all the trials, clocking (PIN 16 continuous clock) from the old cpu because it looked easier than load a realtime HAL comp.
But I noticed that this clock is 2 MHz i.e. 500ns. My jitter is approximately 14.000ns. I think I cannot generate this clock.


No, that is certainly outside what can be generated with oftware and a parport.

Does it just need to be a continuous 2Mhz signal? There are many ways to generate that, one of the simplest (if not the cheapest) would be:
www.ebay.co.uk/itm/New-DDS-Function-Sign...e-Wave-/281225637298
(and that might be a useful device to have access to anyway)
You could build something from a quartz oscillator and support components, but that probably wouldn't end up being any cheaper in the end.

An alternative (more compact) might be:
www.ebay.co.uk/itm/Pro-Mini-Atmega328-5V...&hash=item3ce22fc3df
and the code here forum.arduino.cc/index.php/topic,65434.0.html
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28 Aug 2014 18:51 - 28 Aug 2014 19:02 #50391 by dimech
Hello again!

Back to the lab after summer break!

I thought that grip would be an easy issue. Although seems more sophisticated
This is the schematic for the grip

GRIP

I also have a strobe, direction select pin and hand select pin. I think pin1 pin2 pin3 controls the speed of closing (or opening) and pin1 pin2.not the direction

I bought a second parport so I have got plenty of pins to work this section idividual

Every attempt, control it, by me failed. I need your wisdom
Last edit: 28 Aug 2014 19:02 by dimech.

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21 Sep 2014 08:13 #51390 by vre
An alternative method to generate clocks / other signals / logic circuits is a cheap cpld .
www.ebay.com/itm/5V-MAX-II-EPM240-CPLD-M...-Board-/181436990446
You can take the base 50mhz clock divide by 25 and get 2MHZ clock also can make a lot of other things.
These chips are programmed with logic schematic/verilog/vhdl.

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07 Nov 2014 00:08 #52881 by dimech
After 9 moths i finally finish the project!

I would like to thank the entire LinxCNC community and especially Andypugh. You were the brain of all this effort I was the executor

Thank you again! I hope be useful as you someday for someone

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07 Nov 2014 00:38 #52882 by andypugh
Do you have a video? That would be fun to see.

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