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    TinyGo on Teensy

    Greetings all, tinyGo release 0.14.0 (**with very-basic teensy 3.6 support) has been released and is available from https://tinygo.org/getting-started/ with installation-ready packages ready for Linux, macOS, Windows, and Docker. You can also install TinyGo from source, which is here...
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    TinyGo on Teensy

    Greetings all, If things go to plan, the soon-upcoming tinyGo release 0.14 will have very basic support for the teensy3.6. For details, please see: https://github.com/tinygo-org/tinygo/pull/863 Note that this is a basic, first effort. But once we have the toolchain working and a working...
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    How low is low enough?

    A2D input impedance: c=.01uF difficult to achieve with a timeConst < 1 nanoSecond Greetings all, I've noticed something else puzzling re the K20's A2D and suggested circuit elements for best A2D results. I'm seeking any opinions/insights about this apparent strangeness: In Sect. 6.6.1 of...
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    How low is low enough?

    K20's A2D impedance vs. Analog signal impedance Regarding The K20's A2D impedance and consequences for signal impedance: In Sect. 6.6.1 of http://cache.freescale.com/files/32bit/doc/data_sheet/K20P64M50SF0.pdf Table 24 gives us: R_ADIN (multiplexer resistance) of 2K typical, 5K max. Note...
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    Teensy 3 Encoder Lib

    Quadrature decoding: Clock source(s) and suggested default value for the filters Paul, Datasheet sect. 35.1.2 states: The FTM block diagram shows this as well. So it appears we have some flexibility re clock sources for encoder decoding. Regarding filtering for encoder signals: I haven't...
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    Seeking info on chip/chip differences re peripheral functions

    Thanks for posting links to other docs with info on chip/chip differences. @Jp3141, Thanks much for the pointers to the other documents. FYI, from the links you provided, I found the following table to be the closest to what I was looking for...
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    Seeking info on chip/chip differences re peripheral functions

    Greetings all, Please forgive me if I've missed something obvious, but I'm having some trouble understanding which peripherals are present in the specific chip used in Teensy3 and what pins they can connect to. The datasheet covers several chips, and they don't all have the same peripherals...
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    Teensy 3 Encoder Lib

    Some data on encoder frequencies from rotary encoders Paul, Regarding overflow/underflow/race-condition issues in encoder software: From my reading of the data (I have trouble calling a 1200+ page document a) sheet section, the chip designers included some hardware to make handling...
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    Teensy 3 Encoder Lib

    Don't think analogWrite() precludes encoder reading. Just can't do both at once. @Jp3141, Thanks for your response; glad to see others interested. As I understand it, the existence of analogWrite (a flavor of PWM) for pins 3 or 4 shouldn't be a problem for encoder reading via those...
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    Teensy 3 Encoder Lib

    First notes toward hardware-based encoder decoding for the T3 I took a first look at hardware-based encoder decoding on the T3. For what they're worth, here are my notes from scoping out hardware decoding. Don't look for encoder in the monstrous data "sheet;" instead search for quadrature...
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    Teensy 3 MicroSD guide

    @ZTiK.nl, Thank you for taking the time and effort to put together your Teensy 3 MicroSD guide! Having that really helped me get my SD_Card working with a Teensy3. Should you ever find yourself in the Boston area, I owe you beer. A caution to people wiring up one of PJRC's microSD adaptors...
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    Capacitive touch on a handheld device?

    A quick look at body capacitance when body is floating electrically, approx 125 pF. Dave, I just did a quick look at how much capacitance increases when I touch a wire connected to a touchPin vs. when I don't touch it. If I'm remembering my physics, a conductor, even one not close to another...
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    Teensy 3.0 capactive touch

    Modified files for touchReadTimeLim attached (I hope) If all goes well, the two modified files in the Arduino_1.0.3 and Paul's beta12 teensy3 software, namely touch.c and core_pins.h should be attached to this forum post. Also included is the Arduino sketch that produced the test results in my...
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    Teensy 3.0 capactive touch

    Robin, Thanks for making those file types uploadable. I think that'll make it easier for people on this forum to help one another. Larry
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    Teensy 3.0 capactive touch

    touchReadTimeLim code, this time with formatting preserved Here are the three chunks of code for touchReadTimeLim -- this time with their indentation preserved. :) If you have any comments or corrections, please let me know. Thanks, Larry ==================== Code added to the end of...
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    Interesting observation on the ADC of Teensy 3.0

    @Darkness, First off, thanks for posting detailed data + the code that generated it! I've wrestled with several A2D systems (remember when those were entire boards?) in which the Mux, particularly the Mux's settling time was not sufficient for it to settle to within 1 LSB, before the...
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    Teensy 3.0 capactive touch

    Cannot upload files for touchReadTimeLim Nuts, the forum software ate my code's indenting. @Paul, I tried to attach the files, but I'm getting invalid file type errors for .c, ,h and .ino files. Am I doing something wrong, or are those file types blocked for some reason? :confused: Larry
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    Teensy 3.0 capactive touch

    A time bounded variant of touchRead() Greetings all, First off, I'm quite impressed with the resolution of touchRead measurements. 1/20 of a pF is way more sensitivity than I would have expected! Due to my control-systems perspective, I'm wary a measurement that can take a variable time to...
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