[TriEmbed] Teensy 3.5 sleep experience?

Alex Davis alexd at matrixwide.com
Thu Feb 8 10:58:54 CST 2018

Anyone use a Teensy 3.5 in a low-power situation? I do like the form-factor, as I need an RTC and a microSD card slot.

Here's the sleep library I found (I have not tried it myself yet): https://forum.pjrc.com/threads/23660-Low-Power-quot-Green-quot-Battery-Operation-Solutions-For-The-Teensy-3?p=42776&viewfull=1#post42776

I've been trying the Adafruit Feather M0 but the major drawback is there is no separate RTC power - you have to keep the whole thing powered which is a pain for something that's going to use a tiny lipo that will get run down often. Yes they sell an RTC add-on, but it's expensive and adds considerably to the size of the whole setup.

I have not had much luck in getting my Feather setup to be low-power. When in sleep mode, and the tiny 128x32 OLED I use is in 'standby' mode, I still see about 14 mA being drawn. I think I'm going to ditch the OLED and just configure the RTC over serial. With a battery-backed RTC, this would not have to be done very often.


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