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Yes, I used 2x4.7k pullups for SDA/SCL lines as recommended for the Teensy 3.5 (it is said to have "weak" ones internally).
https://www.pjrc.com/teensy/td_libs_Wire.html

Here is a picture of teensy 3.5 located in the backpack part of the costume.
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I forgot to mention that in the process of developing this, I modified two libraries to make them Teensy-friendly:

https://github.com/arkhipenko/PWM-Servo-Driver-Library_t3...

Hi,

I chose Teensy 3.5 because of the incredible power of the mc (120MHz!) and a math coprocessor.
Active head tracking requires a lot of float match to be performed repeatedly and very very...

Yes, thank you. The sleep timing does not really matter in this case because the actual scheduling is going against values of millis(). The IDLE sleep is enabled for a short period of time if no...

Thank you. This is great. I think it works. It definitely produced different loop counts with and without the statement, Serial continued to work and USB didn't disconnect.

Thanks. I looked at it and tried to use it, but it works differently than I need (I suspect turning off peripherals while I don't need it to).
Anyway, I posted a question to the author of Snooze...

Hi,

I would like to implement support for low power sleep (similar to SLEEP_MODE_IDLE of the Arduino) on Teensy to make it part of the TaskScheduler library...