Forum Rule: Always post complete source code & details to reproduce any issue!

Search:

Type: Posts; User: trent

Search: Search took 0.00 seconds.

  1. Yes, I started using a dedicated Shmitt trigger...

    Yes, I started using a dedicated Shmitt trigger chip (74HC14N) after a LPF with fc = ~500 Hz, and it rails better than my comparator circuit. Here is my new signal, which goes from 0V to 2.06V:
    7830...
  2. Thanks, I'm gonna try both of these things and...

    Thanks, I'm gonna try both of these things and report back.
  3. FreqMeasure Inconsistency in Optical Tachometer

    I'm trying to use the FreqMeasure library to measure the shaft speed of a motor, and received a bit of help from the forum earlier pertaining to the circuitry necessary to get a good, clean digital...
  4. Good idea, here's what it outputted (in my...

    Good idea, here's what it outputted (in my circuit with amplification but no filtration):

    7512

    7513

    (about 16Hz for the first, 32 Hz for the second). This is the signal that's feeding...
  5. quick question Ben (or anyone else), what's the...

    quick question Ben (or anyone else), what's the advantage of using an IC Schmitt trigger versus an opamp (EDIT: or dedicated comparator) circuit like this one?
    7511
  6. Ben--this is really helpful! I'm already using an...

    Ben--this is really helpful! I'm already using an LM358 to amplify my signal. Thanks for speccing a Schmitt trigger for me--I'm hoping that it might help my current random-/over-sampling problem a...
  7. Thanks guys, especially for the quick reply! I...

    Thanks guys, especially for the quick reply! I went with 9x amplification to give me around 2V "high", 0.2V "low" and FreqMeasure picks it up!

    And thanks for the library, Paul. I think writing my...
  8. Digital Logic Voltage Threshold (w/ FreqMeasure library)

    I am trying to create an optical tachometer using a QRB1114 IR reflectance sensor, a Teensy 3.1, and the FreqMeasure library to count the rotations of a spindle that has reflective tape on it between...
  9. Replies
    3
    Views
    2,932

    Hey hytron, you might want to try out F...

    Hey hytron, you might want to try out F Malpartida's LiquidCrystal library (V1.2.1 worked with my LCM1602). I was having compiler issues with NewLiquidCrystal, so I followed this guide, except I used...
  10. Replies
    12
    Views
    3,385

    Got it working. Btmcmahan's T3SPI example worked...

    Got it working. Btmcmahan's T3SPI example worked well without having to designate these pin modes. Turns out the problems were more down-to-earth (literally): grounding issues with my network...
  11. Replies
    12
    Views
    3,385

    So if I want pin 10 to be controlled by SPI, I do...

    So if I want pin 10 to be controlled by SPI, I do something like

    CORE_PIN10_CONFIG = 3;

    in setup?
  12. Replies
    12
    Views
    3,385

    Rookie mistake in not checking my speed. It was...

    Rookie mistake in not checking my speed. It was at 24 MHz.

    Now I've got it set to SPI_CLOCK_DIV8, and I can read it on my network analyzer. However, my CS0 pin (which I assume is pin 10) is not...
  13. Replies
    12
    Views
    3,385

    Noisy, unintelligible SPI signals using T3SPI

    I'm trying to use Teensy 3.0's both as a master and a slave in an SPI setup. However, trying to use the example sketches provided with the library, I haven't been successful at getting the Teensy to...
Results 1 to 13 of 14