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You are only turning the LED on at exactly smplidx = 0. You should change: if(smplidx == 0) to: if(smplidx >= 500000) Also, I think you want another decade to get 10 secs instead of 1 sec.

Thanks for the explanation. I'll try the fix as soon as I get home. I also earlier and mistakenly posted this in Project Guidance. Geoff

Since re-install of Arduino 1.05 and Teensyduino 1.14, I am unable to service interrupts by IntervalTimer on Teensy 3.0. Here is a stripped down sketch I think should work. Could someone with a Teensy 3.0 please run it and reply if the LED goes OFF after 1 second? void smpltimerisr(void)...

Hi, my first post here. I still can't get an intervalTimer to trigger an interrupt on Teensy 3.0. I had timer interrupts working in an earlier Arduino/Teensyduino install, but no more. Here is a stripped down sketch I think should work: void smpltimerisr(void); const int ledPin = 13; //...