New to Teensy.. no upload LED flicker?

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vfxwolf

Well-known member
Just a quick question.

With my Arduino, the built-in LED flickers while code is being uploaded. I dont seem to get this with the Teensy. Code uploads and works... there's just no visual feedback about whats happening.

Is this normal for Teensy? Am I missing a setting somewhere? The flicker was somehow reassuring...

Thanks in advance
 
That is Normal. Teensy code upload is over USB using HID - and the Teensy has USB hardware internal to the Processor - and silently uses an external bootloader/processor to program. The only Teensy LED is the PIN13 output indicator.

Depending on the Arduino in use - UNO - has a separate USB interface chip that talks to the Processor over its Serial Rx/Tx where they have LEDS showing state on those lines - and that is what Flickers.

Teensy just works and quickly - Software will let you know if the upload failed. You can add code below on the LED_BUILTIN in Setup that shows LED sign of life when the code starts to know the upload completed and the Teensy is ready to go.

Code:
setup() {
// ...
  pinMode(LED_BUILTIN, OUTPUT);
  digitalWrite(LED_BUILTIN, HIGH);
 
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