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You should be able to - I have done in the past (I think). Perhaps someone else can help? What I *always* do with any Teensy project is use a different UART for debugging, which would really help you to see what is going on with lots of print statements.

Hi, I'm not sure I completely understand, but looking at the code, you are using one of the on board DAC, so you should likely only configure the board for Serial+Midi. Then you can use the USB port for power or power+MIDI. Is the device perhaps locking up here if not connected to a PC...

That would be amazing, thank you Robin! My (day job) employer has a rather lengthy process for me to release anything into the public domain, so I'll get that underway and let you know on thread when I can.

Aww, thanks. No way I could have done it without Teensy.

Hi everyone, Imagine a piano, with the black keys removed, which can change key, and change mode. There are no wrong notes as such, and so you can bang keys and get a decent result. Add a drum sequencer, some synth, strings, chords, and other bits. The user interface is made up of Cherry MX...

Thanks very much for the info. I don't really need the pins, but wondering if any of my current designs which plug the T3.6 in will work. Don't suppose any of those beta boards are available to less active members like myself if we promise to give good feedback? ;)

I'm really sorry to interrupt this thread and doubly sorry if this has already been mentioned, but will T4 be pin compatible with T3.6? p.s. how exciting!!

Amazing, thank you! I do believe that has solved it. For anyone using sox, that's just adding --channel 1 to the command line. Woohoo!

Hi everyone, sorry to disturb you again, and sorry if any of this sounds silly, my understanding of audio is very weak... I am using AudioPlaySdRaw to play raw files from the SD card. It seems to work very well but the samples seem to play at half speed. I did some experimenting on the...

Thanks. Don't worry, having been married for many years, I am entirely comfortable with talking to myself :D

Just to carry on talking to myself :) ... This works amazingly well! I have 4 16-voice wave synths with some effects on a Teensy 3.6. Thanks very much!

For anyone reading this, "1 wave per note" + additional mixers, etc. seems just too much memory for a Teensy 3.6, I can get AudioMemory to about 110 before other stuff stops working, and that only covers about the first 100 notes. So I am now implementing the more efficient suggestion above. I'm...

Thanks very much, that's great. I think the "full polyphony" approach seems much less complex at the cost of resources, so I will try that first and see where I get to. The only edge case is "what happens if a note is already playing" and I think I can ignore that case because it maybe won't...

Hi everyone, I've started to make sound (!), but I am not sure how to make multiple notes at the same time. I see from the examples that they use multiple waveform sources, but I am not sure in advance how many notes will be played. Should I pick an arbitrary number, say 16, and use them as a...

Aha! Thank you.

Hi everyone! Teensy LC is one of my favourite things ever. I'm working on a custom board and I was slightly confused by the schematic. I see VUSB is connected directly to the USB port +5V unlike the other boards (image below). Does that mean it is actually bypassing the fuse on there? Thanks...

Great, thanks. I think I can handle that.

Well, 6 flash chips, and 6 ram chips - for delay and samples. p.s. for context, I've built a midi-only version: https://www.youtube.com/watch?v=9aXa6NtheTw and https://www.youtube.com/watch?v=BwFLVqQNV5U but I'd like to add real sounds on board, both synth and samples, with some effects.

Thanks for the advice. I'm going to copy your schematic two times, because I also quite like the sound of a long delay with RAM.

Frank B, that is really cool. Could I ask the purpose of the buffer chip please?

I am guessing https://github.com/FrankBoesing/memoryboard ?

Sorry, I also had a follow up question: Can the library handle multiple flash chips together, assuming I have separate chip select pins for each?

Thanks for the offer, Frank B. I get my boards made at macrofab.com, so I never see any non-prototyping parts until they are on the boards.

Thanks for the quick responses. I'll stick to nor, thanks. I was considering some of these, for example: http://static6.arrow.com/aropdfconversion/1ec7417d99b5b4fcf3895cb1df42b48d944115ff/mx66l1g45g203v201gb20v1.3.pdf

Hi everyone, For the audio library, I'd like to use a massive flash chip (like 4Gbit for under 10USD!) for storing and playing back samples. I see reasonably small ones are recommended for adding directly on the audio board, but I was wondering if there is any general limitation (I can't think...

I absolutely love love love love love this concept. I'd very much appreciate a JTAG header.

Ok, thanks.

Thanks for the reply. Did you have a plan for how you were going to support it by reusing the existing USB device code? Or shall I just not bother and use a separate chip?

Hi everyone! I want to use the second USB port on a 3.6 as a device (MIDI) instead of a host. I am not sure how to do the software bit. Please help. I think the hardware bit is simple enough with the jumper that looks like: H--[] D which I will change to: H []--D But totally clueless...

For anyone who cares, my schematic above doesn't really work. My problem is the blue LEDs. If I increase my RSET resistor to a value that is manageable by the 500mA I have available (32 RGB LEDs), then my blue LEDs won't light. If I reduce it, then I just don't seem to have enough juice and all...

For the LEDs and full color range, you'll need at minimum 3 PWM pins with current limiting resistors. If you have many of them, arranging in a matrix and using a chip like MAX7219 (very expensive) is a nice, safe, way to do it without the need for resistors or anything. If you have mad soldering...

Neat boards. Nice work.

Thanks Paul. I would program it over JTAG/whatever rather than the bootloader chip. I guess I'll give it a go.

Thanks Paul.

This is what I have so far. It seems like it should work imagining each separate LED for the RGB CA.

Thanks I read that. I'm still not sure if I can use any Teensy pins.

I'm biting the bullet and moving to the MAX 7219 for LEDs. Two questions, please: 1. Can they be on any pins? 2. Could I achieve the same effect wiring a matrix up to 16 PWM pins? (assuming yes) would it be performant as I have a load of other stuff running off that 3.6. Thanks

Hi, sorry to bump this. Has anyone got an idea?

Hi everyone, as I try to break my project out into smaller boards for maintainability (maybe this is a terrible idea anyway) I would like to do a chunk of it with an LC a-like board. Since I can only barely do QFP packages, I found an almost identical chip: https://www.nxp.com/part/MKL24Z64VLH4...

Great, thanks. I tried them and they are all there. Dealing with Kicad's component editor and libraries is rather treacherous, so double thank-you. p.s. I use the 3.6 component from https://github.com/XenGi/teensy_library in a few boards because it has the extras like the USB host pins.

Hey, that's really nice work - thank-you. I also hacked up: https://github.com/aliafshar/k66lqfp-kicad which is has no Teensy pin assignments and is more like straight out of the data sheet. I think I'll start using yours instead, but it would be *even more* awesome if it was in a separate library.

Also very unlikely to be running untrusted code.

Thanks for the complete information. Very helpful. The audio board is pluggable as an extra in my design so I should be able to operate without it. I'll try them in parallel and see how it works.

Hi everyone, sorry as usual for my cluelessness. I am adding the Audio board to a design which currently uses I2C with 4.7k pull up resistors on each channel. I noticed the Audio board also has pull ups of 2.2k on these channels. Using science(?!), I see that the combined resistors in parallel...

Hi, I am pretty useless for reviewing your schematic, but it would be much easier if there was a PDF or JPEG or something not an Eagle file. Thanks!

Hi, I just tried the USBHost for Midi send and receive works well. Thanks for all you hard work.

Thanks for all the help everyone. I've sketched some out and sent some small test boards to the fab. As always this community has been great.

Thanks, I saw the onehorse charger. Seems a very neat circuit. But in the schematic, the Teensy pins are not labelled so I got even more confused. From the link above:

Aha! Thank-you very much Michael. The second approach seems easier to me. (I'm not a software or a hardware guy :D) In this case charger's VOUT pin is the pin that goes to the battery? And this would fail if you cut the VUSB/VIN jumper...

Hi everyone, I want to add a battery and charging to my project. I was looking at a chip like: MCP73831 (http://ww1.microchip.com/downloads/en/DeviceDoc/20001984g.pdf) I pasted the typical application, and was just wondering how best to attach this to teensy 3.6 My plan is to take VUSB...