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  • frohr's Avatar
    Yesterday, 05:05 PM
    frohr replied to a thread TFT / ePaper in General Discussion
    I found solution here and works well. https://forum.pjrc.com/threads/28674-7-inch-TFT-Capacitive-Touch-Application-Help-Needed/page2
    7 replies | 501 view(s)
  • frohr's Avatar
    Yesterday, 04:30 PM
    frohr replied to a thread TFT / ePaper in General Discussion
    Hey, I found this connection in example: #include <SPI.h> #include <RA8875.h> /* Teensy3.x You are using 4 wire SPI here, so:
    7 replies | 501 view(s)
  • frohr's Avatar
    06-12-2021, 07:16 AM
    This seems much better than I had before. for (int k = 1 ; k < BUFFER_SIZE ; k++) { tft.drawFastVLine(k, 99, 100, (ILI9341_BLACK)); tft.drawFastVLine(k, 100, random(100), (ILI9341_GREEN)); }
    3 replies | 192 view(s)
  • frohr's Avatar
    06-11-2021, 06:51 PM
    Hey all, I have Teensy 4.0 with adxl sensor and I want draw FFT spectrum smoothly in realtime. Now I use something like: x_pos = 0; for (int k = 0 ; k < 299; k++) { tft.drawLine(x_pos,70, x_pos, 70-...
    3 replies | 192 view(s)
  • frohr's Avatar
    06-08-2021, 01:49 PM
    frohr replied to a thread TFT / ePaper in General Discussion
    Dear Mark, what is the minimum wiring? (no touch, no SD, ...) Is it similar like for TFT? https://www.pjrc.com/store/display_ili9341_touch.html Thanks a lot Michal
    7 replies | 501 view(s)
  • frohr's Avatar
    05-18-2021, 08:13 AM
    Hey all, does anybody have experience with SIM800L module and sending data? I need send 4kB every 1 hour or every request. Now I am able send two values every 10 seconds to MySQL and draw data with Google charts to...
    1 replies | 173 view(s)
  • frohr's Avatar
    05-16-2021, 07:31 AM
    frohr replied to a thread TFT / ePaper in General Discussion
    Hi Mark, thank you, it looks great. Could you help me with wiring and show me example of code? Thnks Michal
    7 replies | 501 view(s)
  • frohr's Avatar
    05-14-2021, 03:30 PM
    frohr started a thread TFT / ePaper in General Discussion
    Hello, I want to use for my project display 7-10". Touch display is not necessary. Exist any for Teensy 4.0? Would you recommend me any? It will be for real time plotting charts. Thanks a lot!
    7 replies | 501 view(s)
  • frohr's Avatar
    04-24-2021, 08:41 AM
    frohr replied to a thread Fft in General Discussion
    I think Setup is OK: Serial.begin(115200); pinMode(readPin, INPUT); adc->adc0->setResolution(12); // set bits of resolution adc->adc0->setConversionSpeed(ADC_CONVERSION_SPEED::VERY_LOW_SPEED); //...
    19 replies | 866 view(s)
  • frohr's Avatar
    04-24-2021, 06:17 AM
    frohr replied to a thread Fft in General Discussion
    Could you help me with it? I have no idea how to do it...
    19 replies | 866 view(s)
  • frohr's Avatar
    04-24-2021, 05:26 AM
    frohr replied to a thread Fft in General Discussion
    Teensy 4.0
    19 replies | 866 view(s)
  • frohr's Avatar
    04-23-2021, 07:41 PM
    frohr replied to a thread Fft in General Discussion
    #include <ADC.h> #include <ADC_util.h> #include "arduinoFFT.h" arduinoFFT FFT = arduinoFFT(); IntervalTimer timer; elapsedMicros micros_0; float cas; float period;
    19 replies | 866 view(s)
  • frohr's Avatar
    04-23-2021, 05:17 PM
    frohr replied to a thread Fft in General Discussion
    I try this code now, but I do not know what number is SUMA - I need mV or g... and signal is not uniform. void rms_mm() { suma = 0; microseconds = micros();
    19 replies | 866 view(s)
  • frohr's Avatar
    04-23-2021, 05:01 PM
    frohr replied to a thread Fft in General Discussion
    Measuring bearings vibrations in mm/s. Now I am able measure g RMS for 500-10000 Hz from time signal - confirmed with professional tools. But for mm/s I have to use FFT.
    19 replies | 866 view(s)
  • frohr's Avatar
    04-23-2021, 04:38 PM
    frohr replied to a thread Fft in General Discussion
    Could you give me axample please?
    19 replies | 866 view(s)
  • frohr's Avatar
    04-23-2021, 04:23 PM
    frohr replied to a thread Fft in General Discussion
    I use Teensy 4 What I need: Get values in g or mV after FFT windowing = Read 16384 values (samples) from ADXL to buffer FFT, hanning windowing Calculate frequency for every bin from FFT Calculate gRMS and mm/s...
    19 replies | 866 view(s)
  • frohr's Avatar
    04-23-2021, 12:53 PM
    frohr started a thread Fft in General Discussion
    Hi all, I want read ADXL from analog pin, for example 16384 samples and save values to buffer. Then I want apply FFT (hanning window) and get average value. But I think I have problem because Arduino library FFT has...
    19 replies | 866 view(s)
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