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Good to know. Thanks for your help!

Ahhh - so I was thinking about voltage, when I should've been thinking about current. I've used leds without resisters in the past for quick tests and to save heating up a soldering iron, but I must've got lucky...lesson learned. Thanks jmarsh for pointing this out. With the loose ground wire...

I'm making a midi instrument that uses a 12v power supply to power an array of COB LEDs. I am using pololu 5v,2-5a step down voltage regulator (d24v22f5) to provide a 5v power supply for my teensy 4.0, as well as some led drivers and multiplexers. I have cut the little link between vin and vusb...

Thanks for this explanation Paul. I've put delayNanoseconds (50) in my code and I assume that it is inserting a delay of about 60-76ns. It's certainly running very fast and smooth now... It's hard to imagine that small!

This works: delayNanoseconds(1); ...but so does this (!): delayNanoseconds(99999999999999999999999999999999999999999999999999999999999999999999999999999);

I've removed delayMicroseconds(1) and lowered CPU speed to 450MHz to see what happens. This has the same effect as the delay: the shift registers work again with no noticeable lowering of performance. I'm sticking with the delayMicroseconds(1) solution for now though. As I understand it, while...

That was it - After a bit of experimentation with delays like you suggested, I found that a one microsecond delay in the right place is enough to get everything functioning as it was, with no discernible latency. Such a simple solution, but I'd have struggled to find it by myself. Many thanks...

I was using this code with a teensy lc but had to swap it for a teensy 4.0 when I accidentally damaged it. Since then, the shift registers don't seem to shift. I have tried using a separate shift register and have tested the pins on the teensy. The teensy pins are responding as expected, but...

jmarsh - I think your diagnosis was correct. I've just run the following command trawled from an Ubuntu forum: sudo dd if=/dev/zero of=/dev/disk/by-id/{yourhdd, in my case, sdc1} bs=1MB count=1 which, from what I understand, has deleted the first 500mb of the disk, containing the...

That's handy to know, thanks! I'll look into this and report back...

Hi Mark. Thanks for the suggestion. Sadly, I've done that: I used these for the 4.1 - #define SDCARD_CS_PIN BUILTIN_SDCARD #define SDCARD_MOSI_PIN 11 // not actually used #define SDCARD_SCK_PIN 13 // not actually used and these - #define SDCARD_CS_PIN 10 #define SDCARD_MOSI_PIN...

I have been trying to access the SD card slot on a teensy 4.1 in order to follow the audio tutorial, so far, without success. When I load Part_1_03_playing_music, the monitor prints, "unable to access the SD card". I have had the same response trying to use the SD card slot on the audio shield...