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  1. I didn't see a specific current draw from your...

    I didn't see a specific current draw from your link but in general you can assume about 20mA per individual LED, or 60mA per package.

    If you're talking about USB power from a device like a...
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    Are you looking to just buy 4 of the Cherry...

    Are you looking to just buy 4 of the Cherry switches and build your own enclosure?

    If so, you'd just connect those 4 switches to 4 inputs pins on the Teensy. There's plenty of examples on how to...
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    Try disconnecting the Teensy from all other wires...

    Try disconnecting the Teensy from all other wires and connections with only the USB cable from the computer to the board, then try uploading something basic like the Blink sketch. If it doesn't work...
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    You can't really use resistor voltage dividers to...

    You can't really use resistor voltage dividers to supply current to anything that takes a nontrivial load. From https://learn.sparkfun.com/tutorials/voltage-dividers



    This link from...
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    Your last link (product 251) is the one I used...

    Your last link (product 251) is the one I used (along with the amplifier # 13266). I touch the thermocouple tip to the surface of a board when I run a reflow.

    As for calibration, I have an...
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    @jwatte - thanks for the info on MacroFab, I had...

    @jwatte - thanks for the info on MacroFab, I had not seen them before.

    @linuxgeek - yes that relay should be fine. Regarding your question on MacroFab part sourcing, from their FAQ...
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    No experience with the oven on Amazon, but the...

    No experience with the oven on Amazon, but the reviews make it seem reasonable. If I had to start from scratch I would consider it; people who have done the mods seem happy with performance.

    As...
  8. Sorry, I just realized I didn't answer your #1...

    Sorry, I just realized I didn't answer your #1 question very well.

    For 10x12 you're going to have to do some cable path management either way. If you go with a single pin and FastLED you can snake...
  9. For 120 LEDs I think you'd be able to manage...

    For 120 LEDs I think you'd be able to manage 60fps with either FastLED or OctoWS2811. Even if you go with FastLED and only use 1 pin you'll need something to level shift the Teensy pin to 5V so using...
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    I can't help with an assembler recommendation,...

    I can't help with an assembler recommendation, but Osh Park (https://oshpark.com) is what a lot of us use for low volume boards. I've used them for years with zero issues.
  11. Thanks! I will play with this as soon as possible.

    Thanks! I will play with this as soon as possible.
  12. This looks great! Is your code posted anywhere?

    This looks great! Is your code posted anywhere?
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    You can connect the RPi's ground & UART pins to...

    You can connect the RPi's ground & UART pins to the Teensy's and send the data serially, something like

    RPI Teensy
    6 (gnd) -> GND
    8 (TX) -> 0 (RX)
    10 (RX) -> 1 (TX)

    By happy...
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    Yes, all grounds need to be connected together. ...

    Yes, all grounds need to be connected together.

    [edit - fixed quote]
  15. The RPi doesn't have access to the Teensy's RAM...

    The RPi doesn't have access to the Teensy's RAM to be able to do DMA. You'd have to use some transport mechanism like I2C or SPI to send the bits to one of the Teensy's interfaces so you could use...
  16. I came here to say pretty much what KurtE said....

    I came here to say pretty much what KurtE said. You can easily expand the serial buffer RAM on both sides if necessary, and/or use flow control with GPIO pins and something like attachInterrupt() to...
  17. How about plug the Teensy into a RPi USB port and...

    How about plug the Teensy into a RPi USB port and use serial communication to send the data back and forth.
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    How do you have the Teensy connected to the LEDs?...

    How do you have the Teensy connected to the LEDs? Are you using a 3.3->5V level shifter?
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    You could set up an IntervalTimer and flip the...

    You could set up an IntervalTimer and flip the state



    IntervalTimer myTimer;

    void setup(void) {
    myTimer.begin(Flipper, 10000); // flip the state 100 times per second
    ...
    }
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    For something small like a 5x5 matrix I'd...

    For something small like a 5x5 matrix I'd probably just precompute the pixels and save it in an array, but if you really want to do it programmatically you can do it with Bresenham's algorithm...
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    Yes you can do this, you just need a microphone...

    Yes you can do this, you just need a microphone or line in circuit to an analog pin. The audio library has a reference circuit to convert an input signal to the 0 - 1.2V needed.
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    I've been using the Particle Photon...

    I've been using the Particle Photon (https://store.particle.io/products/photon) as the TCP/IP side of a few projects. The Photon does the web / user interface, the Teensy 3.x's handle the grunt work,...
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    The big advantage your board has is it's already...

    The big advantage your board has is it's already biased to 0.6V instead of 1/2 VCC like the other boards, so there's no need to do shenanigans like this to connect use it:
    ...
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    I doubt it's an issue with the wiring, especially...

    I doubt it's an issue with the wiring, especially from the 245 chip to the RJ45 connector.

    You won't be able to use the PJRC OctoWS2811 library; it's written for WS2812 LEDs (what Adafruit calls...
  25. If I'm understanding you correctly, you get a...

    If I'm understanding you correctly, you get a string like "/?text1=15" and you need to parse the value 15 into an integer variable?

    I don't really ever use the String class but something like this...
  26. In the library APA102.h transfer() function...

    In the library APA102.h transfer() function replace the digitalWrite() statements with digitalWriteFast(), and be sure in your code your data pin and clock pins are constants or defines. This will...
  27. A few things. First, in a quiet environment...

    A few things.

    First, in a quiet environment your Teensy should read around 390: the DC bias of the module is 1.25 Volts and your Teensy is running at 3.3 Volts; 1.25 / 3.3 * 1024 = 388. It will...
  28. Back up to make sure your hardware is working. Do...

    Back up to make sure your hardware is working. Do something really simple like this:



    void setup(void) {
    Serial.begin(9600);
    }

    void loop(void) {
    Serial.println(analogRead(A2));
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    If there is then it's not specific to your...

    If there is then it's not specific to your design. Just a bit ago I tested your module with the Adafruit MAX9814 board and Adafruit's is definitely more noisy. My camera doesn't like the lights in my...
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    Here's some videos of the microphone module...

    Here's some videos of the microphone module hooked up to a T3.6 driving the 64x32 APA102 matrix, running the OctoWS2811 SpectrumAnalyzer example modified for the APA102s.

    Frequency sweep:...
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    I got a microphone module from NeutronNed and am...

    I got a microphone module from NeutronNed and am putting it through its paces now. My first tests were to make sure it works, test it with my APA102s, and see how quiet it is. The short version is...
  32. Hmm..The TFT page says the connector is a 25mm 50...

    Hmm..The TFT page says the connector is a 25mm 50 pin ZIF cable, but the Adafruit page says it has a 20mm 40 pin connector.
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    I went through the FastLED library at GitHub,...

    I went through the FastLED library at GitHub, https://github.com/FastLED/FastLED

    The first part is platform.h, which references the T3.2 at



    #elif defined(__MK20DX128__) ||...
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    It is possible, but it's not great. You can...

    It is possible, but it's not great. You can override their libraries or include your own by putting them in sub-folders in your project folders (but of course that means the downside is you have...
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    One minor correction -- you can bypass their web...

    One minor correction -- you can bypass their web IDE with their command line utilities. You can edit code in your favorite text editor, save it, then go to the command line and issue something like
    ...
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    Hi Leon, I can help you test if you need more...

    Hi Leon,

    I can help you test if you need more volunteers. I'm in the middle of a T3.6 64x32 APA102 project and was planning on using the MAX9814 Adafruit board for sound, so it should be an easy...
  37. In addition to Paul's recommendations, my guess...

    In addition to Paul's recommendations, my guess is that a lot of the slowness you're seeing is due to the Adafruit Dotstar library you're using. You've configured it to use pins 37 & 38 as clock and...
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    Which pin do you mean, the VIN pin next to AGND...

    Which pin do you mean, the VIN pin next to AGND or the 5V pad on the bottom? How are you powering the Teensy?
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    Thanks for the info. Regarding the stencils,...

    Thanks for the info.

    Regarding the stencils, I've had good luck with Osh Stencils (https://www.oshstencils.com). I can't recall if I've ever had them make a 0.4mm pitch one but have definitely...
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    Yes you can specify the alternate pins by using...

    Yes you can specify the alternate pins by using nox771's I2C library, https://forum.pjrc.com/threads/21680-New-I2C-library-for-Teensy3
  41. One thing that you could do is move your...

    One thing that you could do is move your pinMode() out of your setup() and in to the actual reset code, that way the Teensy pin would float (and thus the Wiz pin would stay high because of the...
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    Thanks for working on this, it's very...

    Thanks for working on this, it's very interesting.

    You say you removed FB2 and FB3, did you leave FB1 as the 2500 Ohm @ 70 Mhz chip?

    Did you use a stencil & oven to reflow the MAX9814 or did...
  43. Yes correct The pin is pulled to ground...

    Yes correct



    The pin is pulled to ground immediately after your pinMode() statement



    The pin will stay low for a full second
  44. Thanks for the schematic, yes there's already a...

    Thanks for the schematic, yes there's already a pullup resistor so you don't need to add another one.

    It sounds like you put a 10K inline between the Teensy GPIO pin and the Wiz reset pin? If so...
  45. You can use a pull up resistor for this. I...

    You can use a pull up resistor for this. I usually use 10Ks but higher values should be fine. The resistor will keep the line high but if the Teensy asserts low it will override it.
  46. Sure. Cut the trace between the power pads on the...

    Sure. Cut the trace between the power pads on the bottom of the Teensy, then solder your diode to those pads.
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    I don't think you can chain touch pads together...

    I don't think you can chain touch pads together with resistors using the Teensy's built in touchRead() like you can in your original schematic, at least I haven't seen anything like that before.
    ...
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    The Teensy 3.x has built in hardware for...

    The Teensy 3.x has built in hardware for capacitive touch sense and there's a working library (https://www.pjrc.com/teensy/td_libs_CapacitiveSensor.html), can't you just use that?

    [edit] - See...
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    It doesn't matter if you're using 2 milliseconds...

    It doesn't matter if you're using 2 milliseconds or 2 billion milliseconds, the code you've shown doesn't make sense. What are you trying to do?
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    DemoReel100 is an example that comes with...

    DemoReel100 is an example that comes with FastLED. You can also find it at the FastLED Github page, https://gist.github.com/kriegsman/062e10f7f07ba8518af6
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