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Thread: Teensy 3.2 + RTC wake up on specific time

  1. #1
    Junior Member
    Join Date
    May 2017

    Teensy 3.2 + RTC wake up on specific time

    I have purchased the teensy 3.2 and I will got it tomorrow.

    I will move on from Arduino Pro Mini V3.3 to Teensy because of FLASH & RAM.

    On Arduino I used DS3231 and with this Library I wakeup (setAlarm) the arduino for example at 21:00 every day.
    With that way I save a lot of energy and I have accuracy (send SMS)

    Seems, with some research that I have done, there is not way to use Teensy's RTC (adding crystal) to wake up on exact HOUR-MINUTE.

    Seems more complicated to me...I'm trying to understand HOW to SLEEP and WAKE with external interrupt

    My project has

    So I would like to tell/help me the best possible solution
    1) Iron a crystal + CR2032 v3 bat
    2) Use DS3231 with Library "DS3231_Simple"
    3) other....(?)


  2. #2
    Senior Member
    Join Date
    Jul 2014
    if you need features of DS3231 use it with SW of your choice.
    AFAIK, wakeup can be from external interrupt

  3. #3
    Senior Member
    Join Date
    Jan 2013
    Look at the Snooze library. You can configure wakeup sources. Both digital pins (interrupt from DS3231) and the internal RTC work:

    Make sure to include 'alarm' in the SnoozeBlock, if you use the internal RTC.

    Depending on the sleep mode, not all digital pins work as wakeup sources. the Snooze sketch has a comment with the pins that work in hibernate mode.

    BTW, Teensy 3.5 and 3.6 come with RTC crystal included.

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