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Thread: Teensy 3.5 real time clock problems

  1. #1
    Junior Member
    Join Date
    Jan 2019

    Teensy 3.5 real time clock problems

    Hi there,
    I recently purchased a Teensy 3.5 because I had run out of i/o pins on Arduino, Pro trinket etc.

    The teensy 3.5 is working fine, with the exception of the real time clock. I have used all the examples, changed the libraries, double checked everything and I cannot either set or display the time using the examples provided.

    The serial window just reports the following or the error message contained within the sketch used.

    DS1307 Communication Error :-{
    Please check your circuitry

    Obviously because the rtc is contained within the Teensy 3.5 board it is not possible to check the circuitry. I have not connected the rtc battery to the rtc.

    thanks in advance

  2. #2
    Senior Member PaulStoffregen's Avatar
    Join Date
    Nov 2012
    Quote Originally Posted by jwteensy View Post
    DS1307 Communication Error :-{
    "DS1307" sounds like you're running the wrong example! DS1307 is an external chip you'd connect to SDA & SCL (pins 18 & 19).

    For the internal RTC, in Arduino, click File > Examples > Time > TimeTeensy3. That is the example using Teensy's internal RTC.

    In that example, you should see this function which actually reads the RTC:

    time_t getTeensy3Time()
      return Teensy3Clock.get();

  3. #3
    Junior Member
    Join Date
    Jan 2019
    Hello Paul,
    fixed straight away, the clock is working perfectly.
    I am using the 3.5 in a board I have designed with a 3.5" tft display and a uhf transmitter to send data 7km.
    A suggestion. In your examples on your site, it gives a lot of information on using earlier versions of your Teensy with separate real time clocks.
    It would be helpful to have an example for the 3.5 and 3.6.
    Many thanks
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