Published December 23, 2018 © GPL3+

Persistence of Vision (POV) Globe

Today I will tell you about a new project, a POV globe.

IntermediateFull instructions provided20,742

Things used in this project

Hardware components

Arduino Mega 2560

Adafruit NeoPixel Ring: WS2812 5050 RGB LED

Resistor 330 ohm

Proximity Sensor

DC motor (generic)

OpenBuilds Ball Bearing – 625 2RS 5x16x5

3d Printed parts

Hand tools and fabrication machines

3D Printer (generic)

Soldering iron (generic)

Story

Hi makers,

Today I will tell you about a new project, a persistence of vision (POV) globe.

A quick intro to POV or persistence of vision: Any AC voltage light is actually blinking on and off at a frequency of 60hz or 60 times per second. Our brains perceive this as constant light. It is this concept which we will be taking advantage of, in order to create a spherical image using a single row of LEDs. We used 58 LED for each half. So you need totaly 116 LEDs. And will use a 3D printer for circle. You will find details on video.

Code

d_nya.ino

#include "FastLED.h"
#define NUM_LEDS 58
#define DATA_PIN 6

unsigned char i;
unsigned char m;
unsigned int wait = 1;
unsigned int wait2 =10;
byte hall = 0;
CRGB leds[NUM_LEDS];
bool kalp[40][75] = {

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{0, 0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  1,  1,  1,  1,  1,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  1,  1,  0,  0,  0,  0,  0,  0},
{0, 0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  1,  1,  1,  1,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  1,  1,  0,  0,  0,  0,  0,  0},
{0, 0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  1,  1,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  1,  0,  0},
{0, 0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  1,  1,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0},
{0, 0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  1,  1,  0,  0,  0,  1,  1,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0},
{0, 0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  1,  1,  0,  1,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0}

 
  
  
  
  
  
  
  
  
};





void setup() {
 
  FastLED.addLeds<WS2812B, DATA_PIN, RGB>(leds, NUM_LEDS);
 /*EICRA = 0;
  EICRA |= (1 << ISC10);
  EIMSK = 0;
  EIMSK |= (1 << INT1);
  sei();*/

  attachInterrupt(1, LEDiyak, RISING);
  for (int i = 0; i < 58; i++) {
   leds[i] = CRGB ::Black;
  }
  FastLED.show();
  //Serial.begin(9600);
}


void LEDiyak()
{
 hall++;
  //Serial.println("kesme");
  if(hall>2)
  {hall=0;}
}

void loop() {
  if (hall >0) {
    
   // delay(10);
    for (m = 0; m < 75; m++) {
      for (i = 0; i < 40; i++) {
        if (kalp[i][m] == 1) {
          leds[i + 7] = CRGB::Green;
        }
        else {
          leds[i + 7] = CRGB::Blue;
        }
      }
      FastLED.show();
      delayMicroseconds(wait);
    }

    for (int i = 0; i < 58; i++) {
      leds[i] = CRGB ::Blue;
    }
    FastLED.show();
    delayMicroseconds(wait2);

   
  
    for (int i = 0; i < 58; i++) {
      leds[i] = CRGB ::White;
    }
    FastLED.show();
    delayMicroseconds(wait2);
    //hall=0;
  }
}

Credits

TheTNR

5 projects • 155 followers

A teacher at high school. I am an electronics teacher.

Persistence of Vision (POV) Globe

Things used in this project

Hardware components

Hand tools and fabrication machines

Story

Schematics

Schematic

Code

d_nya.ino

Credits

TheTNR

Comments

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Persistence of Vision (POV) Globe

Persistence of Vision (POV) Globe

Things used in this project

Hardware components

Hand tools and fabrication machines

Story

Schematics

Schematic

Code

d_nya.ino

Credits

TheTNR

Comments

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