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Type: Posts; User: Macona

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    Teensy 4.0 on high speed parallel bus?

    So I need to make a usb interface for a serial communications setup we use here at work. It send 7 bits parallel at 50Mhz into a LVDS transmitter (SN65LVDS95DGG) and also receives the same on a 50Mhz...
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    Yeah, it would be best to disable that. The...

    Yeah, it would be best to disable that. The direction pin should never change state while it is tracking unless it is actually changing directions.

    I have made no changes to the program other...
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    And FYI, the Dec axis pulses look awesome.

    And FYI, the Dec axis pulses look awesome.
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    I got a drive connected. I have found two...

    I got a drive connected. I have found two problems. First the step and direction pulses coming out of the RA axis were only about 1/2 volt. I found in the setup you still had pins set for 11,12,and...
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    I was using the iphone to see if the module was...

    I was using the iphone to see if the module was working. It does, I even changed the modules broadcasted ID.

    Sounds good. I will try to hook up a servo tonight to see how it reacts.
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    Found the problem, iOS does not support SPP, it...

    Found the problem, iOS does not support SPP, it does show up on a co-workers kindle.
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    Oh, I have not done anything, it has been you,...

    Oh, I have not done anything, it has been you, Paul, and HJD that have done the mods. I have just been here sitting, watching, and testing code.
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    I got my prototype wired up. Just need to tie...

    I got my prototype wired up. Just need to tie into the cables for the servo drives. My iphone cant see the BT module. I will have to try my android tablet.
    ...
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    OK, i will give it a try soon. 16us is...

    OK, i will give it a try soon.

    16us is getting a little long for a pulse. Most stepper drives like a pulse anywhere from 1 to 5us.
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    Well, either way thanks. I got my Bluetooth...

    Well, either way thanks.

    I got my Bluetooth module and the line drivers today. Going to dig out a breadboard and wire something up.
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    Wow, that was fast. I look forward to see where...

    Wow, that was fast. I look forward to see where you get.

    And thanks for conceding to my selfish request to get this working with a Teensy!
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    I ordered a bluetooth module today as well as the...

    I ordered a bluetooth module today as well as the 26ls31 line drivers for my servo drives. They should be here next week and then I can actually make something move.
  13. Thread: bad encoder ?

    by Macona
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    I would give that a try first. Look at the...

    I would give that a try first. Look at the comments on spark fun's page for the encoder, lots of other people have similar problems.
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    hjd, I downloaded your Sky Planetarium software...

    hjd, I downloaded your Sky Planetarium software and it does let me park and unpark now that I set a location. The goto command is still flaky. Sometimes it will slew to a location, sometimes it will...
  15. Thread: bad encoder ?

    by Macona
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    You have to debounce the signal, those encoders...

    You have to debounce the signal, those encoders have mechanical contacts. Look at page 4 of their data sheet, they mention about chatter.
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    I am using Christoph's fork from here with no...

    I am using Christoph's fork from here with no modifications. I was just mostly seeing if the software would connect last night. https://github.com/crteensy/OnStep

    I played with it some more last...
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    I loaded up christoph's firmware and it does load...

    I loaded up christoph's firmware and it does load up. I downloaded the ascom driver for it and maxim dl talked to it. It so happens that the led on the teensy is on one of the step pins so that makes...
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    Geesh, I didnt even see all of Paul's responses....

    Geesh, I didnt even see all of Paul's responses. Thanks Paul.

    I need to put together a test bed for this and need to order up a couple line 26ls31 line drivers for the input. Heck, I can probably...
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    The guy that made is said the serial can probably...

    The guy that made is said the serial can probably just go back to just the standard serial routines with the Teensy, it ought to be fast enough, as for the timers he says this:
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    Mostly just getting the code to work on a Teensy...

    Mostly just getting the code to work on a Teensy which may all be moot now, the guy who wrote the OnStep software just ordered a Teensy 3.1 to try.

    If you need a part made just send me a drawing.
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    Yes, it is. I need help! I am not so hot with the...

    Yes, it is. I need help! I am not so hot with the software side of things.
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    OnStep telescope control on teensy.

    I have the mechanical portion of my servo driven telescope mount almost finished so it is time to start messing with the controller for it. I plan on using OnStep, an arduino based controller here:
    ...
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    It looks like it is an issue with...

    It looks like it is an issue with LiquidCrystalFast and Teensy 3.0. I reprogrammed it with the generic LiquidCrystal library that comes with the teensyduino package. I changed it from...
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    I updated to the new liquidcrystal library and...

    I updated to the new liquidcrystal library and that seems to have done the trick. I have not gotten one lock up.
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    It's not just a matter of the display not...

    It's not just a matter of the display not working. I set some hard written analog write values to the pins to the mosfet drivers and when the teensy locks up there is no output to the pins.
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    I can't, my pin usage is locked in FR-4 and...

    I can't, my pin usage is locked in FR-4 and copper.
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    I should have mentioned that I have tried two...

    I should have mentioned that I have tried two Teensy 3.0s and they both do the same. The power is clean, I have checked it with a scope and tried different power supplies. Im going to try the other...
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    Teensy3.0 locking up with liquidcrystalfast

    Loaded up the hello world example to drive a vfd. About 7 out of 10 times it locks up at reboot. This will happen on a cold boot or a software reboot. Unplug it and plug it in a few times and it will...
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