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  1. hi, I am a college student in Korea. Currently I use NEXYS4 DDR products. I would like to use a microphone sensor. 

    But I did not get any information. 
    Can you send me some code of case using microphone sensor? Please.
    1. Show previous comments  1 more
    2. sLowe



      sorry I havent been on this forum in awhile. Let me see if I can find something

    3. sLowe


      also what language do you use? Since it uses a PDM microphone, you can most likely find some code online. Also the built in self test uses it as well.


    4. sLowe


      Here is a good disscussion on its use hopefully you have gotten this working so far



  2. In block design using xadc ip  can we measure external analogue signal ?  

    if possible, can you share demo file !

    1. sLowe


      Yes that is very possible! However a demo does not currently exist using microblaze. Im sure if you dive into the example code xilinx probides, the setup should not be too hard though

    2. sLowe


      xilinx provides*


    3. Raghu


      Thank you for your replay

  3. Hi sLowe,

                 i just want know "is it possible to process multiple analog signals at a time in NEXYS4 FPGA board ?"


    1. Raghu


      using xadc ?


    2. sLowe


      Yes in fact the XADC demo for the nexys 4 is constantly pulling from all 4 analog inputs but only displays one at a time!

  4. We could do something with intensity other than changing the brightness. However with drums, they usually have a pretty consistent frequency profile as long as you are on the same drum. We recently had this project set up to be on a drum set that had different base color values for each drum. (Snare: blue, Bass: green) Then if a drummer hit both of them at the same time and intensity the lights would flash teal. We decided to go back to one drum with a drum line in mind. Although we kept the color mixing algorithm in case we want to revisit that flavor of this project! Or could be used for the quad drummers. As far as rim shots go, the data we get out of the piezo sensor is not quite accurate enough to determine where on the drum you hit. If we had a very nice piezo sensor and ADC, and maybe using a fft library, that kind of information could be figured out. Although looking at wave forms of drum hits, that may be a little advanced for us. (lots of harmonics and sweeps of frequencies) But if this was working, there no reason we couldn't start slapping sensors on instruments and getting a true light show generated by an orchestra or something! Maybe instead moving to technology like the clip-on guitar tuners. Like this one this one.
  5. Hey Guys, Tommy and I are starting a chipKit project that uses piezo sensors to sense a hit on a drum and then light the drum up with LEDs. This creates a pretty cool effect to watch in the dark. Our endgame with this project is to approach a drum line and hook them all up to some WS2812s to create a cool music/light show. Below is our proof of concept video using a single snare drum. We think we can use this technique for most percussion instruments. Cymbals seem to be the only thing we cant use this on so far. https://www.youtube.com/embed/pQdNVhnbReM Our next step is to dress up our drum a little more to make a little more appealing video to present to a drum line. Let us know if you guys like our project or want to know anything about it. We will also attach the MPIDE sketch. We will be posting to this stream as we progress with our project. /************************************************************************/ /* Drum Lights Proof of Concept */ /* */ /* Authors: Thomas Kappenman and Samuel Lowe */ /* */ /* This is a simple sketch that lights up a snare drum whenever */ /* it is struck. */ /* */ /* tested supported boards: */ /* - Digilent UNO32 */ /* */ /* This library is protected under the GNU GPL v3.0 license */ /* http://www.gnu.org/licenses/ */ /************************************************************************/ #include <PICxel.h> //our strip had 43 lights #define number_of_LEDs 43 #define LED_pin 5 #define millisecond_delay 5 //Adjust these values to obtain better results for each drum #define sense 25 //Sensitivity of each drum #define debounce 300 //Debounce to get rid of idle values. PICxel strip(number_of_LEDs, LED_pin, GRB); struct drum{ int r; int b; int g; int zero; }; int red; int green; int blue; int i; int triggerval; int lastval; int in1; int prevTime = 0; drum drum1; void setup(){ strip.begin(); strip.setBrightness(100); Serial.begin(9600); drum1 = {0, 255, 0}; //snare } void loop(){ int a; if(millis()-prevTime > millisecond_delay){ a=analogRead(A0); Serial.println(a); if (lastval-a>100)in1=1; lastval=a; colorLogic(); in1=0; if(red>= 15 ) red -= 15; else red = 0; if(green>15) green-=15; else green = 0; if(blue>15) blue-=15; else blue = 0; for(int i= 0; i<number_of_LEDs; i++){ strip.GRBsetLEDColor(i, green, red, blue); } strip.refreshLEDs(); prevTime = millis(); } } void colorLogic(){ if(in1){ green += drum1.g; red += drum1.r; blue += drum1.b; } if(red >255) red = 255; if(green >255) green = 255; if(blue >255) blue = 255; } DrumLights.zip
  6. sLowe

    Forum Stuff

    Pictures used to answer forum questions
  7. sLowe


    Tommy and I's drumLight project
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