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You would just need to specify "Teensy 3.2 Compatible" for example. Sorry, I thought this was implied since each version has it's own specs. Paul> I agree with what you posted from the law firm's definition. When the Teensy LC was discontinued, I purchased 1000 bootloaders from PJRC,designed a...

I think the Teensy community should use this opportunity to define Teensy-Compatible before it gets misused. I would define Teensy Compatible as meeting all of the following: 1. Code written for the Teensy works without requiring changes. 2. Memory (flash, RAM, EEPROM) are all equivalent or...

Hi jmarsh, that works!

Thanks Paul, I'm unable to create a small sample program that reproduces the problem because when I do, the problem goes away. I can remove some large blocks and the problem remains. But I can remove something as simple as: while (usbMIDI.read()) // catches any incoming midi messages so...

Yeah I actually found a problem! In 1.59 something breaks that works fine in 1.57.3 I cannot print any String values from my custom struct calib[].name In my declarations I have a struct and two arrays of said structure, config[] and calib[]. I have no problem printing any config[].name, but...

Just wondering - Are the latest versions of Teensyduino still 100% backwards compatible with Teensy LC? Just wondering if there's any updates that might break compatibility and if maybe the best bet is to only use the teensyduino version last written when the LC was still in production...

OK, I'll start.. What about adding an AGND like the other teensys have, using a ferrite going to the VSS ground? Also adding a ferrite between VDD and VDDA like on subsequent teensy? I'm guessing these were left off the LC for space reasons?

Hey everyone, Once the Teensy LC went out of production, I bought a handful of mkl26z64vft4 chips and teensy bootloaders. I want to lay out my own Teesny LC equivalent, although I don't have the small-space requirement of the LC so my board can be quite large. I was wondering, if the teensy LC...

Just wondering if anyone has any tips on programming "pass through" knobs? After a preset is loaded, the knob position no longer represents the loaded value. pass-through knob behavior means that when the user turns the knob, it isn't updated until it "passes through" the loaded value and then...

Hey everyone, I use a Teensy LC in a product that I've been lucky enough to sell a few hundred of. I designed my PCB so the Teensy LC just plugs right in, but now that the Teensy LC is discontinued, I am trying to figure out what my options are. A few questions I have: 1. If I'm able to source...

Would love to see a drop-in replacement for the LC come out! including the DAC pin. Not sure how many other people are in the same situation, but I've designed a product that uses the LC and have ordered several hundred of them with only about 30 left in stock. The LC is a great product and has...

Hey MatrixRat.. oh wow, OK I've never seen those dedicated RPN commands. Are they doing anything different than the commands I was using? And are they availale for the serial midi library as well?

Hey MatrixRat, I have no problems sending the Pitch Bend with that command. What I'm trying to do is set the listening synth/software's pitch bend range (how many semitones of change the sendPItchBend command will actually cover). Some details here...

I've honestly never had a piece of software or hardware respond to this.. usbMIDI.sendControlChange(101, 0, midichannel[a]); usbMIDI.sendControlChange(100, 0, midichannel[a]); usbMIDI.sendControlChange(6, midibendrange, midichannel[a])...

As I delve more into FAUST, I can't help but notice that their library is -extensive-. Anti-aliased oscillators, all types of filters, resonating bodies, compressors, fm synthesis, advanced math functions, reverbs, MIDI support, etc. I feel like I can make anything and all of the hard work has...

The only boards.txt on my harddrive (running linux) is in the old arduino-1.8.13 folder. Hmmm.. Good tip on that boards.local.txt though, I wish there was a way to make boards.txt changes that were only per-project.

Hey everyone, going by a suggestion in another thread to edit boards.txt to adjust the audio samplerate https://forum.pjrc.com/threads/38753-Discussion-about-a-simple-way-to-change-the-sample-rate?p=322193&viewfull=1#post322193, I've successfully done this in Arduino 1.8.13, but I recently...

Has anyone got this to work on a Teensy 4 with the Audio Shield? I tried the code below and it compiled, but AUDIO_SAMPLE_RATE_EXACT is still showing up as 44100. I'm calling setI2SFreq(22050) in setup() after enabling the audio shield.

Thanks h4yn0nnym0u5e, I'll start doing some research. The C++ FAUST code gets automatically generated, so it's pretty much a black box to me.. just concerned the added memory won't be seen by the FAUST object since I can't edit the code to have it use a different memory location.

Hey everyone, I've successfully got some FAUST projects working on the Teensy 4, very excited! One of the projects involves a lot of delay lines (144 of them up to 50ms long) and it seems like I need at least triple the memory that the Teensy currently has. Is there a way to add this memory...

Hi Paul, looks like the first method worked! Thank you. Why can't it be even simpler like: String enable[] = { "enable0", "enable1", "enable2", "enable3", "enable4", "enable5", "enable6", "enable7", "enable8", "enable9", "enable10", "enable11" }; and for (int a...

Hey everyone, I'm trying to simplify my code and make the following statements inside a nice/easy FOR loop. I'll be manipulating these variables lots, so being able to address them like an array would help out lots. This code is to change parameters inside a FAUST audio object, but I figure the...

Hi StweartG, I was hoping for something that can turn the FAUST code into an object that would appear as a block in the graphic user interface of the Audio System Design Tool for Teensy. With the appropriate amount of inputs/outputs so connections can be drawn and final code outputted, etc.

I love the Teensy Audio System Design tool, and I love FAUST. Just wondering if there's a way to combine them? It'd be magical to be able to export FAUST code into an object that can be wired up in the Audio System Design Tool showing the appropriate number of inputs and outputs. Maybe it's...

Hey everyone, I have a finished project that's shipping (in small quantities) with an embedded Teensy LC. It outputs MIDI messages through USB but also through DIN MIDI. I've been also using Serial.print to observe raw ADC values. Initially this was just for my personal debugging, but I left...

Rmidi is just a 220 ohm resistor as you suspected.

Hi Hirnwunde, sounds like a fun project! Info on the LM4871 can be found in the datasheet: https://www.ti.com/lit/ds/symlink/lm4871.pdf As you can see, this chip can drive an 8ohm or 4ohm speaker but only delivers 3W maximum. I'm not sure if this will move your speaker enough for the laser...

Hey rcon, self-taught PCB layout is a bit of a challenge. I have been doing occasional boards for over 10 years now and each time I learn something new. The first time things blew up (the footprint for the transistors were all backwards), by the third time things worked. My suggestions would...

Hey everyone! So I've recently completed a little MIDI controller that sends MIDI data via USB using the Teeny LC. Everything is working great so far. I've Compiled this as "MIDI" and I'm still using the Serial.print for some debugging information, etc so I can see it through Arduino Monitor...

Thanks for checking that KurtE, although I admit I really don't know what I'm looking at. Is this a potential error in the library itself? And is there any issues if I just keep compiling as "smallest code" so at least it works in the mean time?

Thanks KurtE, I'm playing around on the "working" computer, and noticed that the neopixels work ONLY if the optimizing is set to: Smallest Code Smallest Code with LTO I have a feeling that this was the issue, and I can verify tomorrow when I'm in front of my work computer. I guess the...

I have a strange problem, my program that uses Adafruit_NeoPixel works when I compile it on one computer but not another. The target board is a Teensy LC. Is there a difference between this library as found in the Arduino Libraries section and the one that comes shipped with the Teensyduino...

This might save you some work/stress/etc: My two cents would be to think about how many discrete steps a person could actually ever move a slider like this. Most midi controls are only 128 discrete steps and that is "enough" for sliders and knobs controlling realtime audio parameters. Granted, I...

I figured the best way to figure this out would be to actually measure some Teensy LC's 3.3V rail. Here's the measurements for 30 LC's I know some sort of distribution curve would be better here, but I don't know how to make one in librecalc. The noise level seemed to be about 5mVpp.

Hey everyone, So I have a project that I developed on the 3.2 and want to move over to the LC. I use the 3.3V output pin on the Teensy for a few other things, and I'm just wondering what difference I should expect here going from the 3.2 to the LC? The pinout card shows that the LC is 100mA vs...

Oh interesting, I thought touchRead and capacitiveSensor already did some sort of self calibration.

Hey everyone, So I'm wanting to do a simple capacitive touch sense switch (just off or on) using the Teensy. I'm currently designing the PCB pads and wondering I can leave the soldermask on? This would definitely be a preference for me, so I don't show any bare-copper and can choose the...

I don't want a multiplexer/demultiplexer. The input isn't being routed to a single output at a time, but any combination. So I suppose I would need 12x 1:1 switches. Also can the 4051 pass a bipolar audio signal? I think it only operates in single-ended mode? I did some experimenting with what...

Thanks tschrama, no the teensy ADC or DAC isn't involved. It's just a single analog audio signal and I want to control which of many amplifiers it goes to. There are 12 amplifiers and I need to be able to do any combination of them.. and I have at least 12 digital pins available on the teensy to...

Thank you, Is this also the right application for an "Analog Switch" IC? I can't say I've ever used them before.

Hey everyone, So I want to use my Teensy to control how audio gets routed to 12 different places. The audio is line-level (2Vpp max) and is a single mono signal, and it is going to 12 mono amplifier IC's - the teensy will be switching the audio off/on going to these amps. A quick note: I did...

That worked thanks Paul. Should this line ever be used to configure a DAC on any teensy or should it be removed even when a Teensy 3.2 is the target?

I'm have a strange issue with using the DAC on a Teensy LC. This code works fine on a Teensy 3.2, so I'm a bit confused.. maybe I'm missing something obvious? The code basically reads the ADC value at A9 (at 16 bits) and then outputs the reading as 12 bits to the DAC pin. It works fine from 0...

Hey everyone, I'm wondering if it's possible to run a Teensy LC off of a separate 3.3V power regulator? I see that it has an onboard regulator that's actually within the microcontroller (never saw that before!). So maybe the only way to power this is with a +5V going to the chip? I have a board...

Hey Mark, thanks for replying.. I didn't know the code was different than the arduino map() on purpose and looking at the "more conversation" thread linked in the commented code, it looks like Paul is aware of this exact issue as of May 2020. It also seems like someone else posted the fudgery...

After spending a night trying to debug an issue I was having, I narrowed it down the map() on my Teensy returning an incorrect value. map(1,0, 1, 100, 0); // returns 51 on teensy, 0 on arduino. I'd expect this to return 0, but the function returns 51 on my Teensy 3.2, Teensy LC and Teensy 3.0...

So I might have found what was causing this. My initial problem was that the Teensy in my application sometimes wouldn't turn on from a cold start (after being off for several minutes). When I isolated just the Teensy, I was able to make it not turn on properly, but only by cycling the power...

I emailed you some large-ish files Paul that should hopefully help. I will also try some different things and report back.

It is a Mastech HY1803. I'm also able to get the problem when switching on my project power supply (LM317 +15V into the L78L05) which also has a mechanical switch before the LM317. I did notice that when the Teensys don't run, the crystals aren't oscillating - if that's any help.

Okay I made a little video of the problem happening. It happens on a cold start (after being off for minutes to hours), but the easiest way to demonstrate it on camera seems to be a quick power cycle. I'll also another observation: I couldn't reproduce the problem when unplugging/plugging the...