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  1. Although I have not graduated to using the Teensy...

    Although I have not graduated to using the Teensy 4.0 or 4.1 just yet, I have made a battery powered project using a Teensy 3.2 with an ILI9341 display. For that I use an Adafruit Power Boost 1000...
  2. Digging into this some more, I find that in file...

    Digging into this some more, I find that in file <spi_drv.cpp> it defines all the SPI related pins (11, 12, 13) plus some default pins (7, 9, and 10) and assigns them starting state levels. Of...
  3. This morning I tried setting the PCR lock bit for...

    This morning I tried setting the PCR lock bit for D13. The state of D13 did not change after Ethernet.begin() occurred. This shows something is trying to change the pin state. Of course I...
  4. Ooops, My bad. Yes it is a Teensy 3.2 that I'm...

    Ooops, My bad. Yes it is a Teensy 3.2 that I'm using.
  5. Ethernet.begin() upsets state of Pin D13

    I'm making a battery powered project and am using pin D13 to turn it off via the touch screen. I find the when using Ethernet.begin, it interferes with the state of pin D13, causing it to go low. ...
  6. Maybe you can develop code to self load a Teensy....

    Maybe you can develop code to self load a Teensy. You could be a hero in this forum for doing so. I just don't have the time or need to do it. You should investigate the links in the other...
  7. If your 'new version' is Aruino code *.ino then...

    If your 'new version' is Aruino code *.ino then it must be assembled/compiled & loaded by the environment.

    If your code is a hex file then the Teensy loader can handle it. Currently there is...
  8. Use your short pulses to gate a constant current...

    Use your short pulses to gate a constant current into a capacitor of known value then measure the value of the resulting voltage.

    See: ...
  9. Not much info given here. You must load your...

    Not much info given here. You must load your sketch into the Arduino environment (with Teensy 3.6 support selected) Compile it and load it onto the target device to your Teensy 3.6

    I see you...
  10. Sounds like an SPI bus contention issue. Does...

    Sounds like an SPI bus contention issue. Does your SD Card adaptor use Tri-State buffers on the SCLK, MISO & MOSI lines controlled by CS? ISTR some SD Cards play nice while others don't on shared...
  11. Did you use the Teensy board for another project...

    Did you use the Teensy board for another project where you had cut the USB power to Vin trace?
  12. Check out yard sales and flea markets. Get a...

    Check out yard sales and flea markets. Get a bunch of cigar boxes to keep your stuff in. Stack them and put category labels on the box ends.
  13. Is this a valid method to time code execution?

    I'm trying to make an I2C decoder that uses the PORTx_PCRn register to create DMA / IRQ requests as was described in this POST.

    I'm using a TEENSY 3.2 running at 96MHz and would like to be sure...
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    Found it on the waayback machine...

    Found it on the waayback machine here.https://web.archive.org/web/20180713004819/https://mb-raw.blogspot.com/2018/02/teensy-32-capacitive-touch.html
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    GSL1680 touch screen problems

    I recently purchased a TFTM050A2 display form Buydisplay.com and am having problems getting the touch screen working. Just to be clear though the display part is functioning thanks to the examples...
  16. @Jim Lee You're quite correct. I sometimes...

    @Jim Lee You're quite correct. I sometimes find others ideas lacking thorough documentation explaining their idea. I too wrote my own using the AdaFruit touch paint example and creating more...
  17. In my hardware I have the CS pins pulled up to...

    In my hardware I have the CS pins pulled up to 3.3v via a 10K resistor to keep the TFT, Touch screen, SD Card and WIZ820/WIZ850 adapters inactive while the Teensy pins are being configured and the...
  18. I have not used the audio shield, but, ISTR that...

    I have not used the audio shield, but, ISTR that pin#13 which is the SPI SCLK on the T3.2 conflicts with the I2S audio connection. To reroute the SPI signals to the alternate pins listed on the card...
  19. Apologies for not getting back sooner. Looks like...

    Apologies for not getting back sooner. Looks like you found the motor driver doc that I was referencing. the ADC library is referenced here ...
  20. The DAC8565 is not an I2C controlled device. You...

    The DAC8565 is not an I2C controlled device. You need to bit bang it with a 24-bit serial stream (pg6). Bet if you looked into the Eurorack Module & its software, you would find the code used to...
  21. 1.) I think NXP has some app note regarding...

    1.) I think NXP has some app note regarding control of motors and monitoring their current. The reference is on my work PC though.
    2.) I think the fellow that wrote the analog stuff, (Mr) Pedvide...
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    You must use external resistors on the I2C lines....

    You must use external resistors on the I2C lines. Tie them to 5v or 3.3v (whatever the FT5206 uses). Just configuring the I2C pins with a 'INPUT-PULLUP' won't work as the I2C driver reconfigures...
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    @Frank, Just an FYI that Microchip has a 12-bit...

    @Frank, Just an FYI that Microchip has a 12-bit quad output I2C DAC, the MCP4728 that can have up to 8 different I2C base addresses. Only the -0 and -1 address versions are available at DigiKey or...
  24. The 12.5pf is a specification of the crystal to...

    The 12.5pf is a specification of the crystal to buy. You do not have to add 12.5pf capacitor to the Teensy board. Just get the crystal indicated a few words later, solder it to the Teensy, connect...
  25. Due to the low output voltage change in the...

    Due to the low output voltage change in the sensor alone, you would only get an ADC count range of 187 max. assume Teensy Vref=1.2v, 12-bits resolution (0.293mV/bit)and 55mV at 1.45psi 55mV /...
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    I am not familiar with the Teensy 2. But if it...

    I am not familiar with the Teensy 2. But if it has a second serial port available then it can be connected to an FTDI rs232 to USB device and communicate with a different serial on the PC. if you...
  27. Using an FT232 adaptor on say serial1, or serial2...

    Using an FT232 adaptor on say serial1, or serial2 would work to receive commands on a Teensy. If you use serialEvents be sure to specify the port being used. I have done this and have also placed...
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    Well if I make a guess the Teensy is drawing...

    Well if I make a guess the Teensy is drawing 300mA then the 7805 is dissipating (12-5) * 0.3 = 2.1watts. You didn't say anything about tthe package style of the regulator. If the regulator is...
  29. @Gunnar, you are absolutely correct. I recently...

    @Gunnar, you are absolutely correct. I recently went thru the same learning curve. Those pages you referenced are probably still valid for Arduino and older versions of Teensy. Since you are...
  30. I would recomend looking up your senior engineer...

    I would recomend looking up your senior engineer and inviting him/her out for a drink to discuss this circuit. If he left the company look him up on Linked-in and try to connect there. Try to get a...
  31. Panels as in box panels. They will usually be...

    Panels as in box panels. They will usually be the first ones touched. Like when the user picks up the control box.
  32. I think @GremlinWrangler is right on with the...

    I think @GremlinWrangler is right on with the button rep rate issue. Tapping it slowly in your circuit will function well but nailing it willy nilly helter skelter will cause improper operation. ...
  33. Best is to connect all box panels to ground, at a...

    Best is to connect all box panels to ground, at a point near the connectors mounted on the box.

    It is unclear how your externally powered version will get it's power. From a PC, a wall wart,...
  34. @tonton81 is on the money for controlling...

    @tonton81 is on the money for controlling external devices. To control the whole Teensy circuit you would have to add a device similar to the AdaFruit Push-Button-Powewer switch breakout. That...
  35. You need to use both sets of SPI pins on the...

    You need to use both sets of SPI pins on the display in parallel. Check out the BuyDisplay.com data sheets for the display for their pin assignments.

    Also there are pins to use as a CS for the...
  36. I believe Digi-Key has some SD Flash cards rated...

    I believe Digi-Key has some SD Flash cards rated for industrial use (-40 to 85c). Slightly more expensive than others, but available.
  37. I may have had a similar issue with a previous...

    I may have had a similar issue with a previous project where the serial monitor unexpectedly closed and Arduino programmer complained about not being able to set the serial port parameters in the...
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    [QUOTE=edrummer;215623]the led needs to come on...

    [QUOTE=edrummer;215623]the led needs to come on or off with the the note on/note off commands. The buttons will be mapped to parameters like record, so when I press that button the led in the switch...
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    Do your switches pull the pin to ground? ...

    Do your switches pull the pin to ground?

    Perhaps you could wire the LED Cathode to the switch and the Anode to power thru a current limiting resistor. That way when the switch is activated the...
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    Are you aware of TeensyID.h ? It reads out the...

    Are you aware of TeensyID.h ? It reads out the MAC, Serial # and UUID as well as a few other identifiers. Don't recall who wrote it, but, it works well. Not sure if it supports Teensy 4.0...
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    Could you provide a reference to the issue you...

    Could you provide a reference to the issue you are concerned about. I've read here that some power supplies, when turned on do not ramp up the output fast enough, or in a non-linear fashion, and...
  42. Going by the math you are correct. However...

    Going by the math you are correct. However there may be some current limit per group of pins that may become a fly in the ointment. Also if one of the LEDs gets accidently shorted Cathode to...
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    You may have better luck with this question in an...

    You may have better luck with this question in an electronics design news group (ie. usenet). Sci.electronics.design, also available through Google groups is one such possibility.
  44. 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...
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    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...
  47. 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...
  50. 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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