Project tutorial

# Persistence of Vision (POV) Globe © GPL3+

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

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## Components and supplies

 Arduino Mega 2560 & Genuino Mega 2560
×1
 Adafruit NeoPixel Ring: WS2812 5050 RGB LED
×1
 Resistor 330 ohm
×1
 Proximity Sensor
×1
 DC motor (generic)
×1
 OpenBuilds Ball Bearing – 625 2RS 5x16x5
×1
 3d Printed parts
×1

## Necessary tools and machines

 3D Printer (generic)
 Soldering iron (generic)

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.inoArduino
#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() {

/*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;
}
}

## Schematics

• 11 projects
• 36 followers

#### Published on

December 23, 2018

#### Members who respect this project

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