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Hi Chris many thanks for your help! I was not aware of these macros to configure the pins. Very handy! I did a similar test to try out various different settings for the pins in order to reduce the noise: unsigned SPEED_MASK = 0b0000'0000'0000'0000'0001'0000'0010'0000...

Hi all I'm using a Teensy 4.1 for an audio device with both an external DAC and an OLED display. I noticed that using the OLED via SPI introduces quite some noise in the audio signal. I would like to try if limiting the slew rate* on some of the SPI pins improves the situation, however i have no...

Its a great idea, keep me posted! When i started designing the Polaron, there was no THT version of this kind of addressable RGB LED (afaik), so i went with SMD (and kind of enjoy soldering it by now). But most problems i hear people have building the polaron have to do with the LEDs, i'm sure...

Hi The polaron uses WS2812b LEDs. Apparently there are through hole versions of this LED, just google for WS2812b through hole. I have never worked with them so far. If you want to use these, you'd need to create a new PCB, replacing the SMD footprints with throughhole footprints (or a footprint...

Hi Paul, many thanks, thats helpful as always. I'll try to integrate a CS42448 on my board and just use some of its inputs/outputs for the time being. Seems like a future proof approach.

Hi all, Im working on an audio project where i'm currently using a Teensy 4.1 and a Cirrus Logic CS4344, giving me a high quality stereo output and no input. I want to add at least one more stereo output and would not mind having the option of a stereo input too. I'm torn between adding a second...

The problem seems to be with the SD library. Its seems you have installed an additional SD library which is used during compilation, and not the default SD Library that is part of the Teensyduino installation. Try to remove this library here (save it somewhere else, if you need it again)...

The part list is in Hardware section on the main github page (readme): https://github.com/zueblin/Polaron

I did a similar test a while ago. Used the same synthesized sounds and played on a teensy 3.6 connected to the audioshield and on a teensy 3.6 using the built in DAC. I didn't really do a structured, scientific analysis, more like a quick comparison using the kind of sounds i usually do with...

very nice, thanks for sharing!

Wow, it looks lovely and i love the ideas for sound shaping. Would be interesting to see/hear it in action! Nice work!

I tried something similar yesterday (storing / recalling the state of a sequencer to SD card) and decided to use the arduinoJson library for this (https://arduinojson.org/). I think using a json format for storage has some advantages over dumping whole structs as binary data: - easy to debug...

I can confirm what @drjohn has already reported to me a while ago (thanks for trying this @drjohn!): The current Polaron Hardware and Firmware work fine with a teensy 3.5, no problems at all so far (they even run in sync :D ). I'll probably stick with the 3.6 as the default for futher...

wow, thats brilliant. Also love the other projects on your site

Wow, awesome! Love the pan drum!

I've never tried to run the polaron with a teensy 3.5. In terms of hardware layout, i don't see any problems, as the 3.6 / 3.5 seem to be pin compatible (as far as i can see) and i only use 3.3v everywhere. In terms of performance: I don't know how much room i have left now using the 3.6. My...

Thanks Robin for posting this and the awesome teensy!

I use delay() only in the setup function. Its used for a short animation that lights up all leds when the unit its powered on. In the main loop i don't use delay (for reading the shiftregisters i use delayMicroseconds(5), but this is so short, it should not matter in the timing of the...

Made another video of the Polaron and Blofeld both synced to ableton live. The patterns have been programmed in advance and during the video i'm playing with track mutes and pattern switches and of course the cutoff knob on the blofeld :D

I'm planning to use usb-audio as an alternative to analog out and read that the non-exact 44100 sample rate of the teensy can cause problems. If that really is the case, then i would be interested and use the alternative audio library. But its more of a nice-to-have than a must-have for me at...

Hi, there is some great info on drum synthesis here: https://www.soundonsound.com/techniques/practical-bass-drum-synthesis For a simple 808 like kick (not an exact reproduction though) i would start with a sine wave oscillator (low frequency, e.g 50hz) and two envelopes: One to shape the...

Thanks, glad you like it! Interesting concept also on the shapeshifter project, love the included breadboard for trying out different sensors! Looking forward to see what people do with it.

The main reason for putting the chip and shiftregisters on the back is of aesthetic nature, i didnt like the green pcb of the teensy combined with the black of the main pcb. Secondly, i want to keep the front as flat as possible, so that its possible to put everything behind a faceplate or even...

The PCB/hardware works fine for me (but i'm not a electrical engineer, so there might be things a pro would do differently). There is an annoying ground loop, when the polaron is powered via Laptop USB and the audio goes back into the laptop via soundcard. I don't think i can do much about this...

Hi all, To round off the recent wave of teensy based DIY drum machines, here's my take on the subject, the polaron (one can never have too many drum machines). The project is driven by my curiosity to understand and experiment with interaction patterns on digital musical instruments and how to...

Thanks Paul. Tried this, and it works - the flash no longer runs out of memory. However as you pointed out, erase is slow and is now blocking the whole instrument for about 400ms. 1) Since erase just seems to reset the bytes to 0xFF, could i overwrite the file without erasing the old data...

Hi all, many thanks for your answers. I need to have a fixed number of samples on the flash memory and they all have the same fixed size (eg. 8 samples, 256KB each). But i need to be able to change the contents of the files or overwrite them, without running out of space eventually (each of my...

Heres a minimal sample that reproduces the problem. With a freshly erased flash memory, the code in the loop method executed 128 times. After that, a new file with the same name cannot be created anymore, even though the log output indicates, that the previous files with the same name were...

Hi, thanks a lot for your answer. Indeed it seems that the flash chip is filling up and finally running out of space. I could verify this by counting the number of successful writes before the problem starts to occur. Its always the same number and the number is consistent with my sample file...

Hi, I'm building a drummachine/sampler using a teensy 3.1, audioshield and a W25Q128FV Flash chip to play samples from and record samples to. Im using the SerialFlash Library (version 0.3) to access the flash chip. From time to time, i can no longer create new files on the flash chip (i'm...

Hi Pensive, Thanks for sharing your progress, information and code. its very valuable, as i'm also building a teensy based musical instrument (https://vimeo.com/129864363) Best, tom