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Have a look at the TeensyThreads library and put the display update code in a thread loop. I have a synth that updates the display this way and handles Midi and complex audio without noticable delay.

I think it's just good grounding that you get with a four layer PCB. Any noises I get are from USB plugged from a pc which can be eliminated with a cheap isolator in between. My display has no...

I'm using a four-layer board, with a Teensy MicroMod, PCM5102A and a similar ILI93141 display. I could run your code except there's no touch screen. I don't hear any SPI noise at all.

Hello, yes I've seen it! I was planning to steal the sequencer code eventually for my next project actually. The interface looks very nice. I'm using the same screen and the ILI9341_t3n library for...

Yes, Teensy 4.

A really nice project. I had the parts laying around and made my own with a T4.1 and a PCM5102A. I've always wanted a DX1!

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Hello, are you using a MIDI note 35 to trigger a routine that shifts twice at time intervals? If so, how about using TeensyThreads to handle the shifting routine when triggered by the noteOn...

Hello, I know people have been tearing their hair out and broken the F5 key on a couple of laptops waiting for an update on this. I've got my dodgy TeensyMM working again. I replaced the two PMIC...

One mouse, not one device.

It should appear on the pc as Serial + Keyboard + Mouse + Joystick, and you can connect via serial while simultaneously using it as a USB mouse. I've not tried it, but I use Serial + MIDI + Digital...

Hello, have you thought about how your going to connect them? The mouse can connect to the T4.1 USB host port and the T4.1 to the pc via its normal USB client port. There is an example program for a...

Hello, I'm getting around to having a look at my non-functioning TeensyMM. There isn't much to easily change really other than the MOSFETs connected to the PMIC. I've looked at both the crystal...

Rule number one - always connect the ground pins. They are there to be connected. They aren't big enough to cause ground loops and there are worse consequences for not connecting them usually. Watch...

Watch this guy's videos: https://www.youtube.com/c/NotesAndVolts/videos
This one in particular:https://www.youtube.com/watch?v=VejO8rDdhzo

This has come up several times before on the forum. Have a look here: https://github.com/ElectroTechnique/TSynth-Teensy4.1/tree/master/TSynth You need to set the phase_accumulator to zero by adding a...

This is also known as keyboard tracking, it's discussed from #11 here: https://forum.pjrc.com/threads/67218-Filter-Tracking-with-Resonance-issue

Hello again. :D I've received a new Teensy MicroMod and it works on both ATP board and my PCB. The other one failed in an odd way, refusing to work on all my PCBs immediately and then after a couple...

It started failing on the ATP board yesterday and today. The MM isn't visibly damaged, I've looked at both sides under a stereo microscope.

Just now, I've managed to get it programmed by using the...

I'm getting the same problem with the TeensyMM on the ATP board now. When plugging in, the Serial USB is not present in Arduino IDE and a simple Blink program fails to run. Pressing Boot on the ATP...

Hello Kurt,

a) Yes multiple times.
b) I've checked around the board and the pins on the M.2. USB to the M.2 isn't shorted.
c) Yes, those are fine.
d) I've tried a separate power supply and...

Thanks for the help Paul. I tried a tantalum instead and still no change. I put a scope on the 3V3 while it was attached to a pc and got this, which doesn't look particularly worrisome:

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I...

Yes, it's four layer: signal, GND, 3V3, signal. I've tested the voltages and GNDs on the M.2. I've removed and bypassed USBLC6 and soldered a new USB micro connector direct to pads 4 and 6 as seen in...

Hello, I've spent some time troubleshooting my problem with USB and I've come to the conclusion that there's nothing wrong with the PCB or the track routing. I'm suspecting it's the power-on...

Hello, I'm still hitting a brickwall with this. I get the following log produced by Teensyduino 1.55 when I plug USB in:


20:53:41.537 (ports 2): WM_DEVICECHANGE DBT_DEVICEARRIVAL
20:53:41.537...

If I apply 5V directly to the PCB, sometimes the TeensyMM operates and the LED blinks. Is there some start-up conditions not being met? I think all my GNDs are GNDed. Capacitance problem?

I tried the Blink program and there's no flashing LED, so the TeensyMM simply isn't running.

By the way, this is the extent of technical support on Sparkfun's dedicated Micromod forum:...

Other than GND, 3V3 and VBUS power and the USB, are there any other mandatory connections? I haven't connected BATT_VIN/3, this is only needed if an ADC is being used? I think this pin can be used as...

Detail of USB micro B to MicroMod. There is a USBLC6 IC to protect the MicroMod - I removed this and bypassed it which made no difference.
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I have the same problem. I've made a prototype carrier board with USB micro B. I'm getting either no recognition of the TeensyMM, USB unrecognised or the "SE Blank RT Family" problem. Putting the...

Digikey are fine and offer much the same.

I bought one of these a while ago and it works fine except I need to set
tft.invertDisplay(true); but the display used on the PCB looks the same as yours. Can you post a photo of how it looks with...

It's often the case that the displays they fit to the PCB have differences between them that aren't apparent when you buy them. There are IPS 160x80 SPI displays I use that have colours swapped and...

Anyone who worked on TD1.54 perhaps?

Hello, does SPI1 on Teensy MicroMod function or is it SDIO only? Something's not working for me. Thanks.

From SparkFun:

The Teensy Processor has two SPI ports. The primary SPI connects to the...

I used this wavetable method in the T3.6 version of my synth for sawtooth and square waves, and found they sound better than the non-bandlimited alternative:
...

I had this last August 2020 as I live in South Korea. I was required to fill in an online form about how it was going to used (in my prototype death ray aimed at obliterating continental America,...

Hello, can I ask what the current status of Teensy Micromod is? Are we waiting for Sparkfun? Is it chip shortages?

But limited to once a month! Looks generous with decent delivery. I think the limit on size is 12cm square per PCB for five, two-layer.

Yes, usually it's a day of good feedback and then they start disagreeing with each other. Try asking if the shield on a USB connector should be grounded... This forum seems exceptional by contrast.

Thanks very much for this. It's solved a problem where resonance values below 1.1 were causing noise for me.

You could try the EEVBlog forum.

Hello, you know that Teensy 4.0 and 4.1 already have USB Host capability? You would be better off with a 4.1, as the host pins have a proper 0.1" pitch plus power management. You can set USB type in...

I like Marco Reps channel on Youtube for entertainment mostly, although sadly he makes videos less often these days. In one he uses a DIY vapour-phase reflow oven to solder some components. Not for...

It's in here: https://github.com/PaulStoffregen/Audio/blob/master/filter_variable.h

Perhaps you're misunderstanding what filterOctave does? And I am too? Perhaps someone can explain, I though it...

You need to set filterOctave lower (1.0f) and it'll track properly. This is why my code has this odd feature where filterOctave is changed with cut off freq, to maintain deep basses at low cut off...

Get a 4.1 because you'll want the power for band-limited waveforms and you can go mad without hitting a limit too soon. Plus it has USB Host so you can connect a MIDI Class Compliant controller...

Thanks very much.

... sorry, to make this clear - I want to access the SD card on the T4.1 as a mass storage device.

Hello, is it possible to get a T4.1 to enter mass storage device mode on the USB client port? I'm running it as a Serial + MIDI + Audio port, so I suspect it would have to reboot in some way to enter...

Yes, it does the job. No noises. CPU usage on a T4.1 is up a bit.

Testing with patch 1 Solina with current linear envelope and this adjustable one:


resting 1 note 4 notes ...