Potentiometer back and forth movement individual pixel

Development Boards Arduino
1

Hi

I am trying to use a Potentiometer to control the back and forth movement of an individual pixel or group of pixels (say 10) on a neopixel strip. I have been trying for days.

Has anyone achieved this, or knows of some links or tutorials.

Any help would be greatly appreciated!

Thank you so much,

Cory

2

Which part do you need help with?

  • Reading the potentiometer

  • Making a decision based on the reading

  • Moving the pixel according to that decision

3

Thanks for your possible help. I seem to have gotten past the potentiometer pixel issue.

I tried to combined two sketches that seems to be working okay individually, and it won’t load. It gets down to the very end with this error code.

exit status 1

expected ‘}’ at end of input

I have tried everything with } I have used up to three (which I’ve never seen more of) down to one with no luck.

If you could take a look and see if you can figure out why it seems to stop loading I would greatly appreciate it.

I Know I’ll have some code tweaking to do once it loads but Maybe I’m getting close to my ultimate solution.

Thank you so much for your time.

Cory

// 
//Arduino code for Neopixel LED controller
// using a potentiometer and switch button
// (C) Ismail Uddin, 2015
// www.scienceexposure.com

#include <FastLED.h>
#include <Adafruit_GFX.h>
#include <Adafruit_NeoPixel.h>
#ifndef PSTR
 #define PSTR // Make Arduino Due happy
#endif

#include <Adafruit_NeoPixel.h>
#define NUM_LEDS 31
#define NUM_PIXELS 31
#define DATA_PIN 5
Adafruit_NeoPixel strip = Adafruit_NeoPixel(31, DATA_PIN, NEO_GRB + NEO_KHZ800);
Adafruit_NeoPixel pixels = Adafruit_NeoPixel(NUM_PIXELS, DATA_PIN, NEO_GRB + NEO_KHZ800);

const byte potPin = A0;
const byte potPin2 = A2;
int litPixel = (6);
int val = 0;
int val_2 = 0;
int colorVal = 0;
int reading = 0;
int x;
int prevVal = 0;
int prevVal_2 = 0;
int switchPin = 13;
int Brightness = 0;
boolean lastBtn = LOW;
boolean NeopixelColor = false;
boolean lastButton = LOW;

uint32_t c_orange = strip.Color(248, 73, 3);

CRGB leds[NUM_LEDS];

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  strip.begin();
  strip.show();
  FastLED.show();
  pinMode(switchPin, INPUT);
   FastLED.addLeds<NEOPIXEL, DATA_PIN>(leds, NUM_LEDS);
   pixels.begin(); // This initializes the NeoPixel library
 
   }

void loop() {
  // put your main code here, to run repeatedly:
  //leds[25] = CRGB::Red; 
        //FastLED.show(); 
        //delay(30); 
    //strip.setPixelColor(0-31,100,0,100);
    //strip.setPixelColor(20,100,0,100);
    int newPixel = map(analogRead(potPin2), 0, 1023, 20, 25);
  pixels.setBrightness(10);
  if (newPixel != litPixel)
  {
    for (int i = 21; i < NUM_PIXELS; i++)
    for (int j = 0; j <21; j++)
    {
      if (i > newPixel && i < newPixel+6)
      {
          pixels.setPixelColor(i, pixels.Color(0,0, 255));
          pixels.setPixelColor(j, pixels.Color(100,0, 100));
          
      }
      else
      {
           pixels.setPixelColor(i, pixels.Color(255, 255, 255));
      }
    }
  pixels.show(); // This sends the updated pixel color to the hardware.
    litPixel = newPixel;
  reading = analogRead(potPin);
  //reading = analogRead(potPin_2);
  val = (reading/1024.0) * 10;
  //val_2 = (reading/1024.0) * 25;
  colorVal = (reading/1024.0) * 255;
 
  
  if (digitalRead(switchPin) == HIGH && lastButton == LOW)
  {
    //delay(250); // Account for contact debounce
    //NeopixelColor = !NeopixelColor;
    
  }
  
  if (NeopixelColor == false)
  {
    // Neopixel LED number code
    strip.setBrightness(10);
    if (val != prevVal)
    //if (val_2 != prevVal_2)
    
    {
      for ( x = 0; x < val; x++)
      
      
      //for ( x = 0; x < val_2; x++) 
      
        //for ( x = 10; x >= val; x--);
      {
        strip.setPixelColor(10 + x,CRGB::Blue); // increasing *
        strip.setPixelColor(9 + x,CRGB::Blue); // increasing *
        strip.setPixelColor(10 - x,CRGB::Blue); // decreasing 
        //strip.setPixelColor(9 + x,0); // increasing *
        //strip.setPixelColor(11 - x,0); // decreasing
      }
      //for (x=val; x<22; x++)
      //for (x=val_2; x<31; x++) 
      { 
        strip.setPixelColor(10 + x,100,0,100); // increasing Erasing *
        strip.setPixelColor(10 - x,100,0,100); // decreasing Erasing
        //strip.setPixelColor(10 + x,0,0,0); // increasing
        //strip.setPixelColor(9 - x,0,0,0); // decreasing
        //strip.show();
       }
      prevVal = val;
      //prevVal_2 = val_2;
    }
//    else
    {
      strip.show();
    }
    
  }
  else
  {
    // Neopixel Color code
    for (x=0; x < prevVal; x++)
    {
      //strip.setPixelColor(x,colorVal,0,255-colorVal);
      strip.show();
    }
  }
}
4

Just Letting you know I got it Working.

Cory