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Neopixel Gemma
// Arduino code for Neopixel LED controller
// using a potentiometer and switch button
// (C) Ismail Uddin, 2015
// www.scienceexposure.com
#include <Adafruit_NeoPixel.h>
#define PIN 0
Adafruit_NeoPixel strip = Adafruit_NeoPixel(12, PIN, NEO_GRB + NEO_KHZ800);
int potPin = 2;
int val = 0;
int colorVal = 0;
int reading = 0;
int x;
int prevVal = 0;
int preVal = 0;
boolean lastBtn = LOW;
boolean NeopixelColor = false;
boolean lastButton = LOW;
void setup() {
// put your setup code here, to run once:
strip.begin();
strip.show();
}
void loop() {
// put your main code here, to run repeatedly:
reading = analogRead(potPin);
val = (reading/1024.0) * 13;
colorVal = (reading/1024.0) * 255;
if (NeopixelColor == false)
{
// Neopixel LED number and colour code
strip.setBrightness(40);
if (val != prevVal)
{
preVal = (val/13.0)*255.0;
for ( x = 0; x < val; x++)
{
strip.setPixelColor(x,preVal,0,255 - preVal);
}
for (x=val; x<13; x++)
{
strip.setPixelColor(x,0,0,0);
strip.show();
}
prevVal = val;
}
else
{
strip.show();
}
}
}
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