UART ‘Serial’ on Teensy is the emulated USB serial port. You need to use the right serial port in your sketch, there is Serial1, Serial2, Serial3, …

Teensy uses its own USB programming application which the Arduino IDE will automatically launch for you. The Teensy doesn’t not appear as a serial port in Windows device manager. When you have it setup and working correctly, it just works. Although its little program loader app that opens tells you to press the button on […]

Teensy won’t reset into bootloader mode by pressing its button Connect the Teensy directly to your PC USB port (we’ve had issues where it works for a while via a USB hub, then just will not connect / go into bootloader mode anymore for no apparent reason). Reboot your PC.