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You have defined 3 variables named MySerial. This is probably not what you intended.

Here's one more idea, although it does not reuse your existing Adafruit Screw Shield R3.

Combine these two item:
Terminal Block Breakout FeatherWing $5.95
Teensy 3.x Feather Adapter $14.95

@mlinton, don't give up. Get a set of "flush" wire cutters, like these for example:

1739217393

These are similar.

These are thin enough that they can slide in between the Teensy and the...

That's the scope resolution operator. It is used for Qualified name lookup.

In this case, the #include of "MIDI.h" declares the namespace named midi. midi::MidiInterface refers to the...

No.

First, two nits:

What is meant by "the circuit also works"? How are you testing this? FYI, the Blink example sketch is a good simple test.

The link you provided is to PJRC's How-To Tips:...

https://en.cppreference.com/w/cpp/language/while

[deleted. I'll try again]

Sorry for the delay in responding, I was kinda busy.

Frank B's comment is brilliant and I agree. If I were to purchase a higher-end audio board (and this thread makes me want to!! ;) ), I'd much...

Paul, I use Logic on Macs but I have limited awareness of other DAW software. However, I did run across a plugin that listed all the DAW software that it was compatible with, and the list was very...

This is a very interesting conversation.

@Van, I'm greatly impressed that you've built your own instruments. But what is the need for 24-bit, different sample rates, etc. for such projects. Would...

Now retired. Like many people with curiosity and motivation, I've acquired semi-pro h/w + s/w engineering and audio knowledge and skills over the last 25 years.

Both of Paul's referenced quotes...

Here,
Floating-Point Audio Library Extension

For completeness, I intended to include this link:

Not sure you've seen the Audio Library Development Roadmap. In it, Paul gives more information about his goals for the Audio Library and why, including 24 Bit Data & Faster Sample Rates.

In the...

I see that you are using a Mac.

"About Arduino..." will show you the version numbers for both the Arduino and Teensyduino. Check that the version number of Teensyduino appears. If not, Teensyduino...

Some additional thoughts....

1) You've said that you are new to electronics. Consider taking a course in Basic Electronics. This could be from a local community college (depth and detail but...

Is the charger an actual Apple charger and not a counterfeit?

I seem to recall from somewhere in the past where I read about fake chargers being dangerous. Here's an article that I found just now:...

I won't be able to help you with the high power requirements but I can off a few tidbits of advice from being a longtime forum reader and having built a few smaller Addressable RGB LED projects....

I see now that serialEvent is part of standard Arduino, not just Teensyduino. Here's the Arduino documentation for serialEvent().

What is the larger context? What do you want to do in the interrupt handler?

Locate "serialEvent" in the Teensyduino source code. You'll find it in...

Perhaps you don't know a library can specify which architectures it supports. Your library does not need not be ported to AVR in order to be published to the Arduino Library Manager.

LOL. Thank you KurtE! That is very good advice.

For what purpose?

macOS Mojave
Version 10.14.1

This is the exact sequence I followed:

1) Download Teensyduino 1.44
2) Run the Teensyduino installer
3) Realizing that I want to install it into Arduino 1.8.8...

I've not looked at the code for very long but I see a potential issue. Both displayed are using the same reset pin? I don't know when the reset pin is asserted (I've not looked at the library code),...

15191

My sketch is here:
15192

I changed it to use pin 6. I also changed the number of LEDs to 8.

I didn't have a Teensy 3.2 handy so I used a Teensy 3.0. For our purposes, they are the...

FYI, the Teensy LC is a ARM Cortex-M0+ processor at 48 MHz, 62K Flash, 8K RAM. It includes a 1 channel level-shifter that can "directly drive WS2812/NeoPixel LEDs". Takes up the same space as a...

I think there are multiple ways to go here.

I suggest you make a small, simple prototype with just a Teensy 3.2 and a few (say, 6 or so) pixels. No resister needed. No level-shifter needed. Use a...

Did you see the FastLED documentation? That is the link to the overview. Other topics are on the right side.



You will learn some new things and have a lot of fun. Please read the FastLED...

I look forward to the preorder link.

@feklee, Paul is right. One can't put a lot of trust in the accuracy of those spec sheets. Also, from post #7, I don't think you've quite got the concept of noise margin or why the level-shifter is...

The first image titled Absolute Maximum Rating is about normal operating ranges for supply voltage, logic input voltage, working temperature, storage temperature and ESD pressure (whatever that is)....

Teensy is a "core". So, yes, the Sketchbook/libraries will override the Teensy "core" libraries. Usually this is not what a user intends but sometimes it is (example: Ethernet 2.0 is intended to...

Arduino doesn't mention the Libraries in "Arduino Sketchbook"/Libraries, but I do. Seem like those are going to be higher priority than Libraries in "Core" directories. So, If I rewrite this once...

Sorry, I don't think I have it quite right yet. That quote above is saying:

1) Libraries in the Sketch directory
2) Libraries inside the "Core" directories. I think the a "Core" directory could...

You're right. Those are search paths for #includes and sources. Note though that the last 3 places are libraries locations.

But, finally, I think I found the answer.

Scroll down to the bottom...

https://forum.pjrc.com/threads/53619-Just-have-to-say-thanks!-Thanks-to-PJRC-amp-Paul-for-making-Teensy-product-line!?p=186665&viewfull=1#post186665

You've asked a very good question. Even though I kinda know the answer, it was difficult to find and still somewhat cryptic. Here's the info direct from Arduino. Scroll down to the "Compilation"...

Teensy 3.2 is a 3.3v device and the DO (data out) signal to the LEDs swings between around 0 and 3.3v. The LEDs are 5v devices.

I think you have a situation where Teensy driving W2811 LEDs works...

That's really strange. I have no explanation for this. If you ever figure it out, I'd love to hear about it.

Paul's OctoWS2811 LED Library is also available and written specifically for the...

I'm at the limit of my ability to help.

I suspect that the core issue is voltage drops in the high current wires and misplacement of the capacitors - these should be at the noise source (LED...

You might want to consider using something like CmdMessenger instead of rolling your own.

I found nothing obviously wrong looking at the schematic.

I suggest to start scrutinizing the wiring. Most import are the high current paths, long paths, and long high current paths ;)

Please...

So, it gets hot when you are running normally and NOT connected to USB? And, the trace is cut?

My first reply was made as quick as I could once I understood that the PS and USB power were being shorted together. I've now read farther and want to respond to that...

Yes, cut the trace. You're...

No. Not "may". If I understand your circuit correctly, you MUST cut that trace. You are feeding 5v in from USB and 5v from your Power Supply. That's very bad and you might damage a number of things....

This topic has been discussed on this forum a lot. But the forums search function is not the best. Instead use google to search for: "site:forum.pjrc.com bottom pins".

You should find enough...

My wish is that I could buy something similar to Adafruit's FeatherWing Prototyping Add-on boards, except these would have native Teensy 3.2 pinout. Imagine both vertical and horizontal expansion.

<drool>

We're getting off topic. But that picture really made my day. I'd considered the notch but was thinking it would require one more daughter board. I didn't think of the simple pins...

I've been evolving a pc board for an Artnet lighting controller (haven't we all ;)). When it came time to start thinking about how to package it, it became clear that I didn't wan't something...