How do I code a Potentiometer to adress speed?

Projects Programming
1

Hi guys,

So I butchered the code from one of the featured projects on Adafruits website:
"Becky Stern's: Neopixel bracelet".
https://learn.adafruit.com/neopixel-rin ... celet/code

I've got little to no code experience but this code with a little alteration works for me personally.
It gives the two 24xLED's neopixel rings the animation I want.
Only thing I'd still like to add is a potentiometer to adress the speed (delay) in this animation.
So I can speed up and slow down the color change.

Could anyone help me as to how I code the potentiometer (analog input A1) into this code?

Thanks for helping me out on this

The Code is below, I know the "Sine" line is huge, but hey, It does the job....

//Basic sine wave animation for NeoPixel Ring Bangle Bracelet
//by Dano Wall and Becky Stern for Adafruit Industries
#include <Adafruit_NeoPixel.h>

#define PIN 6 
Adafruit_NeoPixel strip = Adafruit_NeoPixel(48, PIN, NEO_GRB + NEO_KHZ800);

int sine[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47};

void setup() {
  strip.begin();
  //strip.setBrightness(90); //adjust brightness here
  strip.show(); // Initialize all pixels to 'off'
}

void loop() {
for(int i=0; i<48; i++) { 
    strip.setPixelColor(sine[i], strip.Color(60, 30, 0)); //change RGB color value here
    delay(20);
    for (int j=0; j<25; j++){
        strip.setPixelColor(sine[(j+i+1)%48], strip.Color(10, 10, 10));
        }
    strip.show(); 
      }      
}
2

Could anyone help me as to how I code the potentiometer (analog input A1) into this code?

You read a value from the analog pin, in the range 0 to 1023. Well, you could, anyway.

How do you want to use that value? As the argument for the delay() function? What does that do for you? If it is what you want, you are done.

3

PaulS:
You read a value from the analog pin, in the range 0 to 1023. Well, you could, anyway.

How do you want to use that value? As the argument for the delay() function? What does that do for you? If it is what you want, you are done.

Cheers Paul,
I got it once I read your post, it was right in front of me but I couldn't get it to work.
Thanks mate.

Here's the code with potentiometer

//Basic sine wave animation for NeoPixel Ring Bangle Bracelet
//by Dano Wall and Becky Stern for Adafruit Industries
#include <Adafruit_NeoPixel.h>

#define PIN 6 //marked D1 on GEMMA

// Parameter 1 = number of pixels in strip
// 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(48, PIN, NEO_GRB + NEO_KHZ800);

int sine[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47}; //these are the pixels in order of animation-- 48 pixels in total
int pot = A1;
int minSpeed = 100; // put a high value
int maxSpeed = 10;  // put a low value

void setup() {
  strip.begin();
  //strip.setBrightness(90); //adjust brightness here
  strip.show(); // Initialize all pixels to 'off'
}

void loop() {
for(int i=0; i<48; i++) { 
    strip.setPixelColor(sine[i], strip.Color(60, 30, 0)); //change RGB color value here
    int valPot = analogRead(pot);
    int speed = map(valPot, 0, 1023, minSpeed, maxSpeed);
    delay(speed);
    for (int j=0; j<25; j++){
        strip.setPixelColor(sine[(j+i+1)%48], strip.Color(10, 10, 10));
        }
    strip.show(); 
      }      
}