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  1. There have been problems reported in the past...

    There have been problems reported in the past that were solved by putting a 10K pull-up on the CS lines to hold them inactive (not floating) when the Teensy started to execute its setup(). Aparently...
  2. On some of my projects I use the Sparkfun Open...

    On some of my projects I use the Sparkfun Open Log data logger. I listen in on the Rx line to the display monitor and capture all the data that gets sent out.
    ...
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    I think the serial port is closing when the...

    I think the serial port is closing when the Teensy acts as a keyboard.

    Perhaps while debugging your code in this case, when the USB acts as a keyboard, you should either:

    1.) Use a FTDI USB...
  4. This is what sets the RTC at program time. ...

    This is what sets the RTC at program time.


    // -------------------------------- deal with RTC stuff
    // set the Time library to use Teensy 3.0's RTC to keep time
    ...
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    ISTR the ACS711 is a 5v device and 0amps is an...

    ISTR the ACS711 is a 5v device and 0amps is an output of 2.5v with maximum (positive) current translating to about 5v. The Teensy can only tolerate 3.3v max on the analog input, so it has to be...
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    Sounds like the PB switch may be damaged somehow....

    Sounds like the PB switch may be damaged somehow. I would look at the card that came with the Teensy and apply a jumper wire from ground to the program pad briefly and see if the Teensy responds to...
  7. Why not just have the time on the PC/MAC that...

    Why not just have the time on the PC/MAC that programs the Teensy set to UTC, instead of local time? I understand it is not what you asked, but I see it as achieving the same end goal. Otherwise...
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    The Teensy T3.2, T3.5 & T3.6 have a power...

    The Teensy T3.2, T3.5 & T3.6 have a power management controller (PMC). They also have comparitors (CMP) and analog inputs that you could program to do the same via software. Heck it's all software...
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    @TelephoneBill Thank you for the code...

    @TelephoneBill Thank you for the code snippet.

    @Thgeremingenier Thank you for the finer detail.


    I'm adding this post to my reference list in hopes it provides a helpful pointer in...
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    @KurtE The OP was mentioning pins related to...

    @KurtE The OP was mentioning pins related to different SPI busses. Not knowing what his intentions were I chose to relay to him your SPI driver that handled multiple SPI busses.

    @UHF I have...
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    Your #DEFINES are for bus 0. There are 3...

    Your #DEFINES are for bus 0. There are 3 different SPI buses on T3.5 and T3.6. Each of those buses requires a different driver, unless you use the one @KurtE has created.


    Bus #0 uses MISO...
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    I believe this is the first time that the CMP is...

    I believe this is the first time that the CMP is shown to be working. Would you please share a code snippet to show us what you did?
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    I notice that MOSI 21 is on #1 while MOSI 7 is on...

    I notice that MOSI 21 is on #1 while MOSI 7 is on #0. Same for SCLK. They are on a different SPI bus.
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    There is a PLL or DLL circuit on the chip that...

    There is a PLL or DLL circuit on the chip that multiplies the base clock of 16MHz to a higher frequency.
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    You are correct in stating there is a multiplexer...

    You are correct in stating there is a multiplexer behind every pin. Only some of the pins can be used though. On he card there a pin labels that are a lighter shade of grey, those are the...
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    You can find a copy of the pin reference card...

    You can find a copy of the pin reference card here.

    If there are serial port pins still available on your pcb you can jumper them directly and define the CAN pins as DISABLE in your pin...
  17. Found it. I was referencing a part of an array...

    Found it. I was referencing a part of an array during a read that was not valid.

    Also found I was not manipulating some bits improperly too '&&' and '||' when I should have used '&' or...
  18. Is there a limit to the number of global variables used?

    I'm using Arduino 1.8.5 along with TeensyDuino 1.40.
    I am using a Teensy 3.2. Currently the sketch is at 42% of program storage space and 18% dynamic memory.

    I am having problems with my code...
  19. I note there have been several tries to use the...

    I note there have been several tries to use the comparitor, no success so far though. I also wonder if zero crossing is do-able on the Teensy as voltage swings are limited to the positive domain. ...
  20. What you really want is the gerber files. Eagle...

    What you really want is the gerber files. Eagle has a ULP that can be used to import into Eagle format. KiCad may have a similar conversion program available.
  21. The display that I use is from buydisplay.com. ...

    The display that I use is from buydisplay.com. it is a TFTM032-3 display with a resistive touch screen using the xpt-2046 controller.

    I am using these divers;
    #include <ILI9341_t3.h> and ...
  22. @Defragster, Please standby as all my info for...

    @Defragster, Please standby as all my info for this project is at the workplace, I'll respond on Monday.

    @Jens, It appears you are reporting what I am with the x & y data values staying the same...
  23. Oh yeah, try putting some delay(xxx) statements...

    Oh yeah, try putting some delay(xxx) statements to allow for some 'reaction time' to take your finger(s) off the display.
  24. I too am having problems with the touch screen...

    I too am having problems with the touch screen commands. I started with the 'touchPaint' example. It appears that they do not function correctly (as advertised) and others also have similar...
  25. How much larger? Look at Buydisplay.com for...

    How much larger?

    Look at Buydisplay.com for other size displays. Some larger ones may still be compatible with ILI9341 drivers. Their 8" unit using RA8875 is compatible with a driver written...
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    https://forum.pjrc.com/threads/54915-I2C-Examples-...

    https://forum.pjrc.com/threads/54915-I2C-Examples-not-working-on-Teensy-3-6?p=195889&posted=1#post195889
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    Be sure to have a common ground connection to all...

    Be sure to have a common ground connection to all of your modules. This fellow seemed to have the same problem and common ground resolved it.
  28. Absolutely, there must be a common ground...

    Absolutely, there must be a common ground connection between the two Teensys.
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    What you are looking for is a high side bipolar...

    What you are looking for is a high side bipolar current monitor. This could be in the form of a single chip such as an 'ina139' * or an instrument amplifier that can monitor the small...
  30. I don't think they will work for your...

    I don't think they will work for your application. I believe they are for long wave IR (3uM to 1000uM) not the shorter wavelength just above Red (880nM to 1500nM). Their sensors are more like an...
  31. If the video is in an R-G-B format or perhaps...

    If the video is in an R-G-B format or perhaps NTSC, could you take that signal and feed it into a comparitor circuit for level detection and feed the compare output into a counter to register the...
  32. @Bicycleguy You did the right thing to isolate...

    @Bicycleguy You did the right thing to isolate the long bus from the short bus. However, I don't think it is necessary to tri-state the SCK and MOSI lines to the remote electronics. Only the MISO...
  33. Sometimes a triangle or square file helps to be...

    Sometimes a triangle or square file helps to be sure the traces get broken without spilling too much blood from the slip of the knife.
  34. Have you tried adding a large-ish 4.7 to 10uF...

    Have you tried adding a large-ish 4.7 to 10uF capacitor down near the on-board SD-card for 3.3v? Pads near 46-47 or along the 'H' crossbar would be a good place for the on-board SD-card.
    Paul...
  35. Markonian is on the right track to keep the whole...

    Markonian is on the right track to keep the whole assembly as compact as possible. An additional twist I have done is to notch out the PCB to accommodate the height of larger modules like the...
  36. Short of directly soldering the boards together...

    Short of directly soldering the boards together as MichaelMeissner recomends, you can look at the offerings from Advanced Interconnections or Mill-Max . Certainly not cheap, but, can be very low...
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    The analog inputs should be fed from a low...

    The analog inputs should be fed from a low impedance source, otherwise the impedance of the analog input is essentially in parallel with the impedance of the pots used. Either change your pots to a...
  38. I would like to see a full port worth of pins...

    I would like to see a full port worth of pins available. 8 and/or 16 bits.
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    YES, you can load a *.HEX file from windows. I...

    YES, you can load a *.HEX file from windows. I bought a DIY thermocam from GroupGets and there were instructions on how to do it. Sorry, but is has been awhile since I did this, so can't give...
  40. Suppose I do have a bad actor on the SPI. Would...

    Suppose I do have a bad actor on the SPI. Would it be possible to re-wire its' bad MISO line to the alternate MISO line on the Teensy to avoid the bus contention, without having to wire in an extra...
  41. Don't know if you're a TV fan or not but on CSI...

    Don't know if you're a TV fan or not but on CSI shows the good guys wear headsets with coiled wires (like springs) leading up to them to give some play in the wires.

    Also BTW have you seen this...
  42. Since you want your project to be small / light...

    Since you want your project to be small / light weight, have you considered making a battery pack to fit in your pocket with a built-in regulator and using small gauge (#24-26) wire to convey the...
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    @Darcy . . . You could probably use a 2n2369,...

    @Darcy . . . You could probably use a 2n2369, 2n4401 or a 2n3904 NPN or even a BSS123 n-mosfet for the drive transistor. Also it appears the TDK piezo does not have its own oscillator and relies...
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    Yes, that is where I was point to to change the...

    Yes, that is where I was point to to change the circuit. Ceramic caps should be fine in this application.
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    Perhaps if Paul would share the artwork, pads...

    Perhaps if Paul would share the artwork, pads only + outline, from the bottom layer of these boards, someone could create a good footprint / mechanical drawing for all to use.
  46. You are on the correct path. The MAX rating is...

    You are on the correct path. The MAX rating is 50 mA so you don't want to use all of it. 2 mA of LED current may be on the shy side especially if you get a weak opto. I recomend breadboard first...
  47. The sampling rate depends on the number of bits...

    The sampling rate depends on the number of bits of resolution you are sampling with and what the speed of the processor chip is. 8-bits samples faster than 16-bits but loses resolution. Don't...
  48. Some SD Card sockets have a physical switch to...

    Some SD Card sockets have a physical switch to detect the presence of a card. You could hook this up to an S-R latch to detect a missing card. Or you could monitor the activity of the SD Card...
  49. Since you mention use of a voltage regulator, I...

    Since you mention use of a voltage regulator, I wonder if there is a power on reset issue as others have experienced with an external power supply. Either try a good POR chip to provide a clean...
  50. Have you looked at New Haven Displays available...

    Have you looked at New Haven Displays available on Digi-Key? 800 to 1000 nits brightness they claim sunlight readable. ...
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