So far, I had only used Arduino for professional purposes where I needed to make a test fixture, and the real-time response time was not critical. And that too with Arduino Due (84MHz). Having used Teensy 4.0 in a prototype for a graphics acceleration engine for an industrial controller, I now...
I've used Teensy 4.0, and was really impressed with the capabilities. One suggestion that I have is to release it in a form factor with Castellated edges (Just like ESP32 modules from Espressive), with more GPIOs, but without the microUSB connector, or footprints for the SD card etc. Any...