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I downloaded Teensyduino from the link above and ran some tests on Catalina 10.15.4. Multiple monitors, mouse scroll wheel vs trackpad, scrolling, resizing, all behaved normally with no crashes.

You could use transistors to switch them, that way the Teensy is just driving the transistor and not the LED. Google Arduino

You could also use something like a 74hc245, there's several examples...

USB (5 pins in a row) spacing is 0.1 inch pitch

Ethernet (2 rows of 3) spacing is 2mm pitch

Very cool and interesting project!

For what you've told us I'd say there's no practical advantage of one over the other.

Even something hybrid like one 74hc154 controlling 16 of the pots and teensy pins controlling the remaining 9...

A1) https://www.instructables.com/id/12V-Motor-Control-With-5V-Arduino-and-NPN-Transist/ (NPN), https://startingelectronics.org/beginners/circuits/arduino-buzzer/ (PNP) just replace the 12V with 5V...

I don't think you can connect it directly; the board wants 5V signals and the T4 runs at 3.3V. You'd need something like this https://www.adafruit.com/product/1902 with some pin modifications here:...

Could you try a different cable? Some USB cables are charging only, they're connected on the power pins/wires. and not the data pins/wires.

Hi @KurtE, thanks for the pinout card (#94). I think I've found an error.

You've got digital pins 40 & 41 on the same GPIO 1.21.

19921

I believe 40 is 1.20 and 41 is 1.21

My mistake. Thanks for the clarification.

In response to #76 (and AlanK's reply #78) I connected 16 LEDs to pins 19, 18, 14, 15, 40, 41, 17, 16, 22, 23, 20, 21, 38, 39, 26, 27 via a pair of 74hct245's and everything works as expected.


...

The 3.3V for the Teensy 3.2 comes from an LP38691 regulator (schematic at https://www.pjrc.com/teensy/schematic.html), and the datasheet for it says it can take up to 10V. So yes you got lucky you...

My understanding is the tick rate how often the OS wakes up to do housekeeping or switch tasks so it would be 1/F_CPU, do you have a different definition?

Are you looking for something like...

The fastest way I could think of would be to connect one of the RPis to the Teensy directly via USB serial and the other by hardware serial, but I'm mostly wondering if this is an XY problem....off...

How about a Teensy reading the analog inputs of 4 of these over I2C

https://www.adafruit.com/product/732

Try moving pinMode from the loop to the setup.

No Teensy 4 does not have a DAC, you'll need to use one of the 3.x boards or additional chips https://forum.pjrc.com/threads/57208-No-DAC-on-4-0-Alternatives?p=212602&viewfull=1#post212602.

Most likely.

https://forum.pjrc.com/threads/57842-Future-Teensy-features-amp-pinout

You send 2 lines of data with every row so for x32 boards it's 16 iterations. This https://bikerglen.com/projects/lighting/led-panel-1up/ explains it better than I can.

As far as the update rate...

For the most part you're on the right track but I'm not sure about 10 boards across. If you get the 64x32 boards that's 640 pixels that need to be clocked out * 16 rows * at least 50-60 times per...

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...

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...

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...

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...

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...

@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...

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...

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...

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...

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.

Thanks! I will play with this as soon as possible.

This looks great! Is your code posted anywhere?

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...

Yes, all grounds need to be connected together.

[edit - fixed quote]

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...

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...

How about plug the Teensy into a RPi USB port and use serial communication to send the data back and forth.

How do you have the Teensy connected to the LEDs? Are you using a 3.3->5V level shifter?

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
...
}

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...

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.

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,...

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:
...

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...

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...

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...

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...

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));

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...

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:...