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Type: Posts; User: gbathree

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    Hi folks, just wanted to close those out so the...

    Hi folks, just wanted to close those out so the mystery is solved. It's something stupid of course. I had an old version of teensyduino (1.20 rather than 1.27) which fixed it all up. Stupid me,...
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    I can confirm udev rules are installed. I've...

    I can confirm udev rules are installed. I've used this computer extensively with teensy 3.0 and 3.1, that's why it's so perplexing.

    I have the most recent version of teensyduino, and have tested...
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    Here's the output from syslog as Paul suggested....

    Here's the output from syslog as Paul suggested. You can see in the first set, when the device is plugged in without programming or restarting, teensy is detected correctly. After pressing program...
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    AWESOME - I'm embarrassed I didn't see that. ...

    AWESOME - I'm embarrassed I didn't see that. Thank you for the help :)
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    ARM + bootloader only

    We're interested in putting the ARM chip from the current version of the Teensy 3.1 on our own board (project is www.photosynq.org, the device is called the MultispeQ), but use Paul's bootloader. I...
  6. A little off topic, but we have a chrome app...

    A little off topic, but we have a chrome app (javascript) which we use to communicate with a device we built on top of the Teensy (the MultispeQ... the project is called PhotosynQ and can be found at...
  7. Hey guys, I am looking to use the Duff's library...

    Hey guys, I am looking to use the Duff's library in a slightly different way and am seeking some feedback.

    We are taking analog_reads on a detector, using the 16 bit pins (I think A10 and A11). ...
  8. serial connection issues, Windows and Chrome app

    First, background: we are using the Teensy 3.1 to build a handheld spectroscopic device for measuring plant health (www.photosynq.org).

    We have slowly troubleshot connection with Windows, and...
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    JBeale - we definitely read that through before...

    JBeale - we definitely read that through before we started, that was really helpful. We were hoping perhaps there were other workarounds.

    stevech - Not really. If it was true 16 bit, our signal...
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    Thanks whollender and pkourany - it sounds like...

    Thanks whollender and pkourany - it sounds like the 12/13 bit actual resolution is somewhat of a hard limit mostly determined by noise within the chip itself. I was hoping that some new crazy ideas...
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    We have addressed power supply (we use a Lithium...

    We have addressed power supply (we use a Lithium battery with very low internal impedance) - the photodiode is on a circuit board so there's no cables. Light levels are fairly high, but the signal...
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    Decreasing noise on Teensy ADC

    We are trying to chase down some noise on a pin photodiode detector we're using to measure IR fluorescence in plants. We recently made some hardware changes to the photodiode to dramatically reduce...
  13. Hey, haven't posted in a while but just wanted to...

    Hey, haven't posted in a while but just wanted to say that we've finally got a working prototype. It has a CO2 sensor, temp, humidity, light meter with light temperature, and the ability to measure...
  14. Thanks for the explanation - it actually really...

    Thanks for the explanation - it actually really helps to understand the history!

    It's ok - fix wasn't too bad. I switched all atime_t to time_t, but I also had to do change
    ...
  15. upgrad 1.0.3 to 1.0.5 resulted in issues with atime_t

    I recently setup the Arduino IDE v 1.0.5 along with the newest version of Teensyduino downloaded from PJRC in Ubuntu 12.04. My program (in fact, many versions of the program) which had compiled just...
  16. Hmmm... Interval timer does not yet have all the...

    Hmmm... Interval timer does not yet have all the functionality that PITimer does, like setting the period and frequency of the timer... do you know when that might be added, or am I missing...
  17. Definitely - let me get some cooler pictures...

    Definitely - let me get some cooler pictures first - I should have them by early next week. Actually, we run our bioreactors on the Teensy 2.0++ so I'll snap some pictures of those too!

    Thanks...
  18. Awesome - just got a chance to look at it... and...

    Awesome - just got a chance to look at it... and I'm confused about one thing - loglow produced two different libraries for timers, one is PITimer and the other is IntervalTimer... is there a...
  19. So I was having some issues recreating the signal...

    So I was having some issues recreating the signal processing board that Robert had made, so it was taking me a few days just to get the unit back up and running. But I finally did, and the signal...
  20. Yes, I've done that but it only helped some. I...

    Yes, I've done that but it only helped some. I have comparisons between the benchtop unit (called the Ideaspec) and the Teensy-based unit, and it's a very big different quality-wise even with the...
  21. Sorry it's taken me a while to respond, I must...

    Sorry it's taken me a while to respond, I must have missed the last few comments in my inbox:

    duff - an RTOS is probably the most efficient solution for high speed, but I think it takes a lot away...
  22. Ok - we made some progress. Now I've got code...

    Ok - we made some progress. Now I've got code which:

    1) takes analogread()s pretty fast (by setting analogreadaveraging to 1 as suggested) - it takes only a few us per read.
    2) can save data to...
  23. I'm trying to get Dave, the professor here, to...

    I'm trying to get Dave, the professor here, to effectively describe what we're doing on the website, he'll do it much better than me of explaining it (hopefully that'll be the next blogpost on...
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    Thanks Constantin and adrianfreed. I'll give...

    Thanks Constantin and adrianfreed. I'll give that a read and see if I can figure it out. Ideally, in the long run, we'd like samples as fast with as accurate timing as possible. Basically, the...
  25. Phew - sorry it took a few days to respond, been...

    Phew - sorry it took a few days to respond, been trying to work on this to get some worthwhile numbers to share.

    Thanks linuxgeek! In our group we have some good expertise but not a lot on the...
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    Update: Definitely turning off the averaging...

    Update:

    Definitely turning off the averaging made the biggest difference - that gets the speed down to 3us from the standard 20us for a single analog read! Also, my labmate Chris developed a neat...
  27. Teensy 3.0-based device for measuring photosynthesis

    Hello! Me and some other folks are working making a hand-held, open source device which can measure plant photosynthesis. This device will ultimately connect to a cell phone to allow for easy...
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    Speeding up ADC to

    I am working on a project which sampling a measurement frequently - at the slowest we need to sample every 5us. I've tested the ADC using analogread() on the Teensy 3.0 and have found it takes 20 -...
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    Hey guys, I had a similar issue with the Serial...

    Hey guys, I had a similar issue with the Serial Monitor not displaying things that I was printing (using teensy 3.0 with Arduino 1.0.3 downloaded from PJRC). I read through a lot of forum discussion...
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