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Type: Posts; User: sbfreddie

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  1. Replies
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    easone: I think this would be a great addition...

    easone:
    I think this would be a great addition to the Teensy's libraries.
    I have been reading this forum (Every Posting) for around 10 yrs and have found many different applications that could...
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    Jetsream: You could use either a resistor...

    Jetsream:
    You could use either a resistor divider, or an Op-amp with negative gain. So keep in mind that most of these A/D's do not have buffered inputs so they like to be driven from a low output...
  3. Why is this output spewing out SPI info when the...

    Why is this output spewing out SPI info when the Teensy 4.1 does not use SPI?
    It has its own internal QSPI so even including SPI for this board is just a waste of code.

    Regards,
    Ed
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    RomanP: You will have to Parse the input string...

    RomanP:
    You will have to Parse the input string like this:


    /*******************************************************************************************************************
    * This function...
  5. devanshshukla: Here is my suggestion to get to...

    devanshshukla:
    Here is my suggestion to get to the bottom of the challenge.
    Start with disconnecting the base resistor from the teensy and connecting it to the other output of your DC power supply,...
  6. @Kiimes: Look up ENOB (Effective Number Of...

    @Kiimes:
    Look up ENOB (Effective Number Of Bits).

    Regards,
    Ed
  7. devanshshukla: Wow that is a high current low...

    devanshshukla:
    Wow that is a high current low efficiency LED.
    You need to do the calculations for current thru the LED to get the brightness you want and calculate the on resistance of the...
  8. The IR LEDs were not blinking at all....

    The IR LEDs were not blinking at all.
    devanshshukia:
    If the LED's are truly IR how would you expect to see them blinking?
    Most IR LED's emit in a spectrum below human vision so there is nothing...
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    @Jetsream: In further consideration of your...

    @Jetsream:
    In further consideration of your interesting problem, I think I have figured out why your getting all x0FFFF's back from the A/D.
    If you look carefully at the MCP33121 data sheet page 38...
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    After reviewing this data sheet with a finer...

    After reviewing this data sheet with a finer tooth comb, I agree with WMXZ, this A/D will not work with I2C or SPI. Perhaps some sort of bitbanging or as WMX suggests using I2S which has been...
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    25591@Jetsream: I found this page at the...

    25591@Jetsream: I found this page at the manufactures website from their custom testing board that costs $200. It appears that the output Dout requires a pull-up resistor, check out this schematic:
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    @Jetsream: The CNVST timing is very critical and...

    @Jetsream:
    The CNVST timing is very critical and I don't think the Teensy's CS output from the SPI logic can be precisely controlled to get just the right timing. Make sure you read carefully the...
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    It depends on the A/D, some devices use a high as...

    It depends on the A/D, some devices use a high as an idle state, and some devices use a low as an idle state. I was looking at the data sheet and you should study page 38 very carefully. I think it...
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    @Jetsream: It looks to me like your A/D is...

    @Jetsream:
    It looks to me like your A/D is putting out a signal level on the SIO pin of around 1.8 Volts which the Teensy will not recognize. The schematic you show is very difficult to read, so I...
  15. Parkman: I just tried your program on my Mac. ...

    Parkman:
    I just tried your program on my Mac. Same laptop as yours, same OS 10.15.7, same TeensyDuino 1.8.13. Uploaded program 15 times into brand New Teensy 4.0, one after another, NO PROBLEM!
    ...
  16. Kurt: I have an app called SyncMate that claims...

    Kurt:
    I have an app called SyncMate that claims to support MTP on the Mac (MacOS 10.15.7). I have not tried to use it yet, but your development here is the reason I purchased it.

    Keep up the...
  17. I would suggest that all the long wires be...

    I would suggest that all the long wires be installed in standard EMT electrical conduit to shield against EMI & Static electricity. Make sure that both ends of the conduit(s) are grounded to a very...
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    Use of RXEDGIE on Uarts 0,1,2

    Paul, or any other Guru:
    I was reading the Uart section of the K20 Manual today and came across an interesting little tidbit on page 1208 and 1209, concerning an obscure little know interrupt on the...
  19. Kurt: Thanks, Ed

    Kurt:
    Thanks,

    Ed
  20. Hi Guys: It has been a long time since I have...

    Hi Guys:
    It has been a long time since I have posted to this forum, I hope you can see this question.
    Is there a table or chart somewhere that shows which Analog Pins can be read from each A/D...
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    Problems using Xcode with embedXcode

    All:
    ReiVilo and I are trying to solve a rather strange problem with all the recent changes i.e.: Teensyduino 1.36, Xcode 8.3, Arduino 1.82, and embedXcode 7.3.3.
    It seems Xcode builds and...
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    Avenue33: I have already paid for embedXcode+. ...

    Avenue33:
    I have already paid for embedXcode+. Are you suggesting I am required to pay again for this update?

    Thanks,
    Freddie
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    Avenue33: Their are no links in this message. ...

    Avenue33:
    Their are no links in this message.

    Thanks,
    Freddie
  24. Paul: I am having a teensy problem with the...

    Paul:
    I am having a teensy problem with the IntervalTimer on Teensy3.1.
    I have set up three instances of "IntervalTimer":



    One with period set to 200000, one with period set to 500000, and...
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    Paul: I do not have an outdated library anywhere...

    Paul:
    I do not have an outdated library anywhere on this computer.
    The reason that I am getting these errors is because the "#elif defined(__arm__) && defined(TEENSYDUINO)" statement is always...
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    Hi again: I searched the HD and found a few old...

    Hi again:
    I searched the HD and found a few old versions of this library laying around, which I deleted.
    I did a Clean, and then Build and still came up with the same error.
    I also ran a standard...
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    No, the TeensyDuino package is not where it...

    No, the TeensyDuino package is not where it lives. Its in the libraries for Arduino located at:
    /Application/Arduino/Contents/Resources/Java/libraries

    This is the only FlexiTimer2.h that Xcode...
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    Here is my version of the header file: As...

    Here is my version of the header file:



    As you can see the newer version in Arduino 1.06 has the patched header file just like the .cpp file.

    Thanks,
    Freddie
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    Hi: I will not post so much extra stuff to this...

    Hi:
    I will not post so much extra stuff to this forum.

    Here is the first part of the the FlexiTimer2.cpp file:



    As you can see this file has been fixed to recognize the teensy stuff.
    Here...
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    Hi again: I tried the directive from above and...

    Hi again:
    I tried the directive from above and this is the results:



    It seems that the __arm__ variable is still not reaching this library.

    Thanks,
    Freddie
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    I am using embedXcode+ from 2 days ago.

    I am using embedXcode+ from 2 days ago.
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    Hi again: Thanks for the quick reply. I tried...

    Hi again:
    Thanks for the quick reply.
    I tried setting the TEENSY_USB directive as you instructed above and here are the results:




    Any other ideas?
    Thanks,
    Freddie
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    Hi: I am having some problems with the build of...

    Hi:
    I am having some problems with the build of external libraries that contain this requirement to be set: .
    A large amount of libraries in the teensy portion of Arduino have this same...
  34. Paul: Thanks, that was what was responsible for...

    Paul:
    Thanks, that was what was responsible for all the errors.
    I have no idea were that folder came from, very strange!

    Thanks again,
    Freddie
  35. Malloc error on Teensy 3.1 using Mac OS 10.9 and Arduino IDE

    After switching all my SD card code form SD to SdFat once I got all the normal new lib errors worked thru I get what looks like a linker error:


    Using previously compiled:...
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