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Thread: Problem with pjrc.com web pages

  1. #1
    Senior Member
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    Problem with pjrc.com web pages

    Although I can read and post to the forum (obviously) Firefox won't let me see any other webpage such as https://www.pjrc.com/teensy/td_download.html. It says:
    Secure Connection Failed

    An error occurred during a connection to www.pjrc.com. You have received an invalid certificate. ....
    Anyone else seeing this?

    Pete

  2. #2
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    And now it's back and all is well

    Pete

  3. #3
    Senior Member+ Theremingenieur's Avatar
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    Certificate errors like this tend to happen if either the server's or the client's date and time settings are wrong, thus causing the browser to think that a normally valid certificate is out of date.

  4. #4
    Senior Member+ Theremingenieur's Avatar
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    Reading the documentation (data sheets, reference manuals, etc.) helps... The capacitive sensing library mentioned on https://www.pjrc.com/teensy/td_libs_...iveSensor.html was written for the old 8bit AVR processors.

    Most of the modern 32bit ARM based Teensys have an integrated TSI engine which allows to use the Touch pins (see reference for which pins on which Teensy) without external resistors or other hardware. So the touchRead() function is definitively the way to go. If you need "far more" than 12 sensors, you should consider a specific touch sensor IC (these exist for up to 32 or 64 touch keys) and communicating with the Teensy over SPI.

  5. #5
    Senior Member+ MichaelMeissner's Avatar
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    Note that the Teensy LC and Teensy 3.5 do not provide for touch read support.

    Unfortunately, touchRead is not really documented in the main Teensy library page. Here are two rather old posts that talk about it:

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