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Type: Posts; User: tachus42

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  1. Sticky: Phil was it you or someone else who posted that...

    Phil was it you or someone else who posted that they thought the need for opto's was over blown? Apart from possibly solving some noise issues it would seem the biggest danger to the PC port is...
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    My description is a bit confusing. The relay...

    My description is a bit confusing. The relay needs to be activated ( by pressing the reset switch ) before power is supplied and the machine comes out of e stop. Hitting Estop deactivates the relay...
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    This should be better

    This should be better
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    Should have previewed that one. I'll post a...

    Should have previewed that one. I'll post a better diagram shortly
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    +5 IN---------- N/O-----------------------------...

    +5 IN---------- N/O-----------------------------
    | | |
    | | |
    ...
  6. Sticky: I haven't looked at the spec sheet for the 4n25...

    I haven't looked at the spec sheet for the 4n25 lately but it is a pretty slow device. It is for instance useless as a isolater transmitting Midi data at 19200 baud - I tried that and failed!
    So I...
  7. Sticky: heyarnold the 9530 will be fine, but due to it's...

    heyarnold the 9530 will be fine, but due to it's higher on resistance compared to the 9540 it will get a bit hotter and will probably require a small heatsink.
    The kits r us board is very similar...
  8. Sticky: Patrick avrfreaks.net is a good place to start. ...

    Patrick avrfreaks.net is a good place to start. The code is intended for avr - gcc, look for the winavr package.
  9. Sticky: I'm not sure of the usefulness of making the...

    I'm not sure of the usefulness of making the break out board any smaller. All the connectors would end up squashed up together making wiring it up a fidley mess. But yes most of the traces could be...
  10. I didn't look that close . It does seem to be...

    I didn't look that close . It does seem to be labeled as a diode. Maybe its a zener "capacitor" for output protection?
  11. Looks like there is a & b + index sensors with...

    Looks like there is a & b + index sensors with some of the parts (caps) missing for the b channel. It also looks like the output is capacitively coupled. If you follow the outputs do they go straight...
  12. Konstantin i was just guessing as well. Can show...

    Konstantin i was just guessing as well. Can show us a picture of the inside?
    Hook up some power to the plus and common. Check the voltage on all the outputs. If you don't get anything try 1k pull...
  13. Looks like a encoder with differential outputs...

    Looks like a encoder with differential outputs for driving long cables. You should be able to use just the + or - outputs eg use A+ and I+. Connect it up to 10 volts and see what you get on the...
  14. Sticky: Cossie IRL530s will be ok for your motors. You...

    Cossie
    IRL530s will be ok for your motors. You could use a 12 volt supply and 6.8 ohm current limiting resistors as a starting point. The winding connections are shown on the datasheet. Connect the...
  15. Sticky: I'll have to check the supply connections later....

    I'll have to check the supply connections later. It's very unlikely any damage was done by the reverse polarity. Sounds like some heatsinks are needed on the 9540's try a small shaped piece of...
  16. Sticky: Konstantin, the supply droppers will get hot....

    Konstantin, the supply droppers will get hot. With 2 * 150 and 25V they will dissipating 3/8 Watt each, which is comfortably inside the 1 Watt rating. The Zener will be dissipating 1/2 watt and will...
  17. Sticky: Im not sure the motor sitting on a encoder...

    Im not sure the motor sitting on a encoder transistion is a problem either. If you use a schmitt trigger on the input it should be ok but I thought i would just avoid the possibility.
    500 line...
  18. Sticky: I took the encoder polling rate from the expected...

    I took the encoder polling rate from the expected max step rate because in practice you can't really have the motor running any faster than this (well unless you multiply the steps with the micro)....
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    You can work it out this way - each phase uses...

    You can work it out this way - each phase uses 6.5A * 2.7V = 17.5 Watts. Total for 3 motors is 105 Watts. Your Power supply is 24V * 12A = 288 Watts. So you have plenty of margin.

    This is...
  20. Sticky: You will need to place a limit on how big the...

    You will need to place a limit on how big the intergral term can get other wise it can build up and swap the others. I didn't use interupts for the encoder - just polled it at 40 kHz and read them...
  21. Sticky: Phil you didn't goof it was a problem with the...

    Phil you didn't goof it was a problem with the last version. Anyway heres the fixed files.
  22. Without the chopper board the connection is like...

    Without the chopper board the connection is like your diagram, but if the power supply voltage is higher than the stepper voltage you would also have a resistor in series with each common connection....
  23. Sticky: Sorry for the low quality pic's it's the best i...

    Sorry for the low quality pic's it's the best i can do at the moment.
  24. Pigi You have got it right. The Common...

    Pigi
    You have got it right. The Common connections of the steppers is connected to the positive supply though some current limiting resistors which are mounted off the board.
    The chopper board can...
  25. Sticky: Yes you are right there is a error. I actually...

    Yes you are right there is a error. I actually had a small bridge there on my prototype but assumed it was a problem with the toner transfer or etching rather than the design.
    Thanks for the errata....
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