This was a simple little coding exercise I did for fun that simulates a mini roulette wheel on an Adafruit neopixel ring. The code isn't perfect aesthetically, but it is functional. so go ahead, wire up 1 neopixel ring and let me know what you think! below is a video of it running followed by the source code. Alternately, here is a link directly to the code.
/*
Neopixel Ring Roulette wheel sketch.
"Spins" a roulette wheel and lands on a random value.
I am not 100% satisfied with the aesthetic, but its as close as I can get.
I would prefer a more realistic spinning to a slow effect with the final numbers slowly dropping onto a value
similar to the price is right money wheel.
I tried several approaches, but I can not seem to nail it.
A linear increment of a delay does not look right
If anyone can improve upon it, I would love to see what results they come up with.
If you make it improve it, let me know at tom[at]damage[dot]cc
It would be rad to build a full 36+2 position American style roulette wheel out of neopixels!
Code is based on the adafruit neopixel 'strandtest' code.
*/
#include <Adafruit_NeoPixel.h>
long randNumber; //variable to hold random number value
int pos; //used to track position of lit segment
//──────────────────────┤ User Variables ├────────────────────────────
#define PIN 6 //data pin used in for neopixel
int spins = 6; //how many times to 'spin before starting to slow down and settle
#define dir 1 //set to 1 for clockwise rotation, 0 for counter clockwise.
//───────────────────────────────────────────────────────────────────────
// Parameter 1 = number of pixels in strip, value at 16 for NeoPixel Ring.
// Parameter 2 = pin number (most are valid)
// Parameter 3 = pixel type flags, add together as needed:
// NEO_KHZ800 800 KHz bitstream (most NeoPixel products w/WS2812 LEDs)
// NEO_KHZ400 400 KHz (classic 'v1' (not v2) FLORA pixels, WS2811 drivers)
// NEO_GRB Pixels are wired for GRB bitstream (most NeoPixel products)
// NEO_RGB Pixels are wired for RGB bitstream (v1 FLORA pixels, not v2)
Adafruit_NeoPixel strip = Adafruit_NeoPixel(16, PIN, NEO_GRB + NEO_KHZ800);
//──────────────────────┤ SETUP Function ├────────────────────────────
void setup() {
randomSeed(analogRead(1+2+3+4+5)); //initialize floating pin (analog pins 1-5) as the seed for the RNG
strip.begin();
clr(); //clear the display for good measure.
strip.show(); // Initialize all pixels to 'off'
}
//──────────────────────┤ Main Loop ├────────────────────────────
void loop() {
randNumber=random(0,16); //fetch a random number between 1-16
//call the wheel
//color used for for odd segments, even segments, and for '0'
roulette(strip.Color(48,0,0),strip.Color(0,0,48),strip.Color(0,48,0));
}
//──────────────────────┤ Roulette Wheel Function ├────────────────────────────
void roulette(uint32_t c,uint32_t d,uint32_t e) {
//spin the number of times (variable 'spin') at full speed
for (int i=0; i<16*spins; i++){
advanceOne(c,d,e, 4);
}
//slow down and 'settle' on final number
for (int i=0; i<(16*6)+randNumber; i++){
advanceOne(c,d,e, (i*.25)+4);
}
//optional press reset button to spin.
//while(1); //wait indefinitely, press reset button on Arduino to spin again.
delay(2000); //reset spins automatically.
} //end 'roulette' function
//──────────────────────┤ Advance One Position Function ├────────────────────────────
//every time this function is called, the led is advanced 1 position on the wheel
void advanceOne(uint32_t c,uint32_t d,uint32_t e, uint16_t wait) {
clr();//Clear the display
if ((pos & 0x01) == 0) { //check to see if position is an even number
strip.setPixelColor(pos, c); //turn on the pixel at position 'pos'
} else //else it is odd
{strip.setPixelColor(pos, d);
}
if (pos == 0) { //or check to see if it is '0'
strip.setPixelColor(pos, e);
}
strip.show();
delay(wait);
if (dir){ //if direction var is set to clockwise
pos--; //decrement the position
if(pos<0) {pos=15;} //resets running count if < 0}
}
else{
pos++; //increment the position
if(pos>15) {pos=0;} //resets running count if > 15}
}
}//end advanceOne function
//──────────────────────┤ Clear all Pixels Function ├────────────────────────────
//clears the display
void clr(){
for(uint16_t i=0; i<strip.numPixels(); i++) {
strip.setPixelColor(i, 0);
strip.show();
}
}