Difference between revisions of "101-50-FLMxx"

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=Code Sample=
 
==Forward==
 
<pre>
 
#include <FastLED.h>
 
 
#define LED_PIN  A0
 
 
#define COLOR_ORDER GRB
 
#define CHIPSET    WS2811
 
 
#define BRIGHTNESS 255
 
 
// Helper functions for an two-dimensional XY matrix of pixels.
 
// Simple 2-D demo code is included as well.
 
//
 
//    XY(x,y) takes x and y coordinates and returns an LED index number,
 
//            for use like this:  leds[ XY(x,y) ] == CRGB::Red;
 
//            No error checking is performed on the ranges of x and y.
 
//
 
//    XYsafe(x,y) takes x and y coordinates and returns an LED index number,
 
//            for use like this:  leds[ XYsafe(x,y) ] == CRGB::Red;
 
//            Error checking IS performed on the ranges of x and y, and an
 
//            index of "-1" is returned.  Special instructions below
 
//            explain how to use this without having to do your own error
 
//            checking every time you use this function. 
 
//            This is a slightly more advanced technique, and
 
//            it REQUIRES SPECIAL ADDITIONAL setup, described below.
 
 
 
// Params for width and height
 
const uint8_t kMatrixWidth = 8;
 
const uint8_t kMatrixHeight = 8;
 
 
// Param for different pixel layouts
 
const bool    kMatrixSerpentineLayout = true;
 
const bool    kMatrixVertical = false;
 
 
// Set 'kMatrixSerpentineLayout' to false if your pixels are
 
// laid out all running the same way, like this:
 
//
 
//    0 >  1 >  2 >  3 >  4
 
//                        |
 
//    .----<----<----<----'
 
//    |
 
//    5 >  6 >  7 >  8 >  9
 
//                        |
 
//    .----<----<----<----'
 
//    |
 
//    10 > 11 > 12 > 13 > 14
 
//                        |
 
//    .----<----<----<----'
 
//    |
 
//    15 > 16 > 17 > 18 > 19
 
//
 
// Set 'kMatrixSerpentineLayout' to true if your pixels are
 
// laid out back-and-forth, like this:
 
//
 
//    0 >  1 >  2 >  3 >  4
 
//                        |
 
//                        |
 
//    9 <  8 <  7 <  6 <  5
 
//    |
 
//    |
 
//    10 > 11 > 12 > 13 > 14
 
//                        |
 
//                        |
 
//    19 < 18 < 17 < 16 < 15
 
//
 
// Bonus vocabulary word: anything that goes one way
 
// in one row, and then backwards in the next row, and so on
 
// is call "boustrophedon", meaning "as the ox plows."
 
 
 
// This function will return the right 'led index number' for
 
// a given set of X and Y coordinates on your matrix. 
 
// IT DOES NOT CHECK THE COORDINATE BOUNDARIES. 
 
// That's up to you.  Don't pass it bogus values.
 
//
 
// Use the "XY" function like this:
 
//
 
//    for( uint8_t x = 0; x < kMatrixWidth; x++) {
 
//      for( uint8_t y = 0; y < kMatrixHeight; y++) {
 
//     
 
//        // Here's the x, y to 'led index' in action:
 
//        leds[ XY( x, y) ] = CHSV( random8(), 255, 255);
 
//     
 
//      }
 
//    }
 
//
 
//
 
uint16_t XY( uint8_t x, uint8_t y)
 
{
 
  uint16_t i;
 
 
 
  if( kMatrixSerpentineLayout == false) {
 
    if (kMatrixVertical == false) {
 
      i = (y * kMatrixWidth) + x;
 
    } else {
 
      i = kMatrixHeight * (kMatrixWidth - (x+1))+y;
 
    }
 
  }
 
 
  if( kMatrixSerpentineLayout == true) {
 
    if (kMatrixVertical == false) {
 
      if( y & 0x01) {
 
        // Odd rows run backwards
 
        uint8_t reverseX = (kMatrixWidth - 1) - x;
 
        i = (y * kMatrixWidth) + reverseX;
 
      } else {
 
        // Even rows run forwards
 
        i = (y * kMatrixWidth) + x;
 
      }
 
    } else { // vertical positioning
 
      if ( x & 0x01) {
 
        i = kMatrixHeight * (kMatrixWidth - (x+1))+y;
 
      } else {
 
        i = kMatrixHeight * (kMatrixWidth - x) - (y+1);
 
      }
 
    }
 
  }
 
 
 
  return i;
 
}
 
 
 
// Once you've gotten the basics working (AND NOT UNTIL THEN!)
 
// here's a helpful technique that can be tricky to set up, but
 
// then helps you avoid the needs for sprinkling array-bound-checking
 
// throughout your code.
 
//
 
// It requires a careful attention to get it set up correctly, but
 
// can potentially make your code smaller and faster.
 
//
 
// Suppose you have an 8 x 5 matrix of 40 LEDs.  Normally, you'd
 
// delcare your leds array like this:
 
//    CRGB leds[40];
 
// But instead of that, declare an LED buffer with one extra pixel in
 
// it, "leds_plus_safety_pixel".  Then declare "leds" as a pointer to
 
// that array, but starting with the 2nd element (id=1) of that array:
 
//    CRGB leds_with_safety_pixel[41];
 
//    CRGB* const leds( leds_plus_safety_pixel + 1);
 
// Then you use the "leds" array as you normally would.
 
// Now "leds[0..N]" are aliases for "leds_plus_safety_pixel[1..(N+1)]",
 
// AND leds[-1] is now a legitimate and safe alias for leds_plus_safety_pixel[0].
 
// leds_plus_safety_pixel[0] aka leds[-1] is now your "safety pixel".
 
//
 
// Now instead of using the XY function above, use the one below, "XYsafe".
 
//
 
// If the X and Y values are 'in bounds', this function will return an index
 
// into the visible led array, same as "XY" does.
 
// HOWEVER -- and this is the trick -- if the X or Y values
 
// are out of bounds, this function will return an index of -1.
 
// And since leds[-1] is actually just an alias for leds_plus_safety_pixel[0],
 
// it's a totally safe and legal place to access.  And since the 'safety pixel'
 
// falls 'outside' the visible part of the LED array, anything you write
 
// there is hidden from view automatically.
 
// Thus, this line of code is totally safe, regardless of the actual size of
 
// your matrix:
 
//    leds[ XYsafe( random8(), random8() ) ] = CHSV( random8(), 255, 255);
 
//
 
// The only catch here is that while this makes it safe to read from and
 
// write to 'any pixel', there's really only ONE 'safety pixel'.  No matter
 
// what out-of-bounds coordinates you write to, you'll really be writing to
 
// that one safety pixel.  And if you try to READ from the safety pixel,
 
// you'll read whatever was written there last, reglardless of what coordinates
 
// were supplied.
 
 
#define NUM_LEDS (kMatrixWidth * kMatrixHeight)
 
CRGB leds_plus_safety_pixel[ NUM_LEDS + 1];
 
CRGB* const leds( leds_plus_safety_pixel + 1);
 
 
uint16_t XYsafe( uint8_t x, uint8_t y)
 
{
 
  if( x >= kMatrixWidth) return -1;
 
  if( y >= kMatrixHeight) return -1;
 
  return XY(x,y);
 
}
 
 
 
// Demo that USES "XY" follows code below
 
 
void loop()
 
{
 
    uint32_t ms = millis();
 
    int32_t yHueDelta32 = ((int32_t)cos16( ms * (27/1) ) * (350 / kMatrixWidth));
 
    int32_t xHueDelta32 = ((int32_t)cos16( ms * (39/1) ) * (310 / kMatrixHeight));
 
    DrawOneFrame( ms / 65536, yHueDelta32 / 32768, xHueDelta32 / 32768);
 
    if( ms < 5000 ) {
 
      FastLED.setBrightness( scale8( BRIGHTNESS, (ms * 256) / 5000));
 
    } else {
 
      FastLED.setBrightness(BRIGHTNESS);
 
    }
 
    FastLED.show();
 
}
 
 
void DrawOneFrame( uint8_t startHue8, int8_t yHueDelta8, int8_t xHueDelta8)
 
{
 
  uint8_t lineStartHue = startHue8;
 
  for( uint8_t y = 0; y < kMatrixHeight; y++) {
 
    lineStartHue += yHueDelta8;
 
    uint8_t pixelHue = lineStartHue;     
 
    for( uint8_t x = 0; x < kMatrixWidth; x++) {
 
      pixelHue += xHueDelta8;
 
      leds[ XY(x, y)]  = CHSV( pixelHue, 255, 255);
 
    }
 
  }
 
}
 
 
 
void setup() {
 
  FastLED.addLeds<CHIPSET, LED_PIN, COLOR_ORDER>(leds, NUM_LEDS).setCorrection(TypicalSMD5050);
 
  FastLED.setBrightness( BRIGHTNESS );
 
}
 
</pre>
 
[[Image:1-froward-1.gif|337*337]]
 
[[Image:1-froward-2.gif|337*337]]
 
 
 
=Download resource=
 
=Download resource=
*[http://s3.amazonaws.com/s3.image.smart/download/101-20-146/17DOF%20Robot%20Assemble%20Guide.docx 17DOF Robot Assemble Guide]
+
*[http://s3.amazonaws.com/s3.image.smart/download/101-50-FLM/Arduino_control_LED_matrix_panel_simple_guide.docx Arduino Control LED Matrix Panel Simple Guide]
 +
*[http://s3.amazonaws.com/s3.image.smart/download/101-50-FLM/Flexible_LED_Matrix_Panel.MP4 Flexible LED Matrix Panel.MP4]
 +
*[http://s3.amazonaws.com/s3.image.smart/download/101-50-FLM/sample_code.zip Sample Code]

Revision as of 10:44, 4 June 2021

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