Controlling a LED Bar using a Teensy 4.1 doesn’t seem to be working, even though there’s no problem when using an UNO R3 clone with the same test sketch.
Is there a solution ?
Thanks
Hi there,
So ,
Are you sure, it’s a 3.3v device or a 5V device…
HTH
GL 
PJ 
Here is the excellent solution provided by Paul Stoffregen on the PJRC forum: reduce the CPU speed to 24 MHz
https://forum.pjrc.com/index.php?threads/grove-led-bar-teensy-4-1.77864/post-367609