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Arduino - Rotary encoder using Neopixel ring indicator
#include <Adafruit_NeoPixel.h>
/* Read Quadrature Encoder
* Connect Encoder to Pins encoder0PinA, encoder0PinB, and +5V.
*
* Sketch by max wolf / www.meso.net
* v. 0.1 - very basic functions - mw 20061220
*
*/
#define PIN 9
#define NUMPIXELS 16
Adafruit_NeoPixel pixels = Adafruit_NeoPixel(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);
int val;
int encoder0PinA = 2;
int encoder0PinB = 3;
int encoder0Pos = 0;
int encoder0PinALast = LOW;
int n = LOW;
void setup() {
pinMode (encoder0PinA,INPUT);
pinMode (encoder0PinB,INPUT);
pinMode (5, OUTPUT);
pinMode (6, OUTPUT);
digitalWrite (5, HIGH);
digitalWrite (6, LOW );
Serial.begin (9600);
pixels.begin(); // This initializes the NeoPixel library.
}
void loop() {
n = digitalRead(encoder0PinA);
if ((encoder0PinALast == LOW) && (n == HIGH)) {
if (digitalRead(encoder0PinB) == LOW) {
encoder0Pos--;
} else {
encoder0Pos++;
}
Serial.print (encoder0Pos);
Serial.print ("\n");
for (byte i=0; i<16; i++) {
if (encoder0Pos == 0) {
pixels.setPixelColor(i, pixels.Color(0, 0, 0));
} else if (encoder0Pos > 0) {
uint32_t pixelColor = (encoder0Pos > i)? Wheel((15-i)*16) : 0;
pixels.setPixelColor(i,pixelColor);
} else {
uint32_t pixelColor = (encoder0Pos < -i)? Wheel((i+1)*16) : 0;
pixels.setPixelColor(15-i, pixelColor);
}
}
pixels.show();
}
encoder0PinALast = n;
}
// Input a value 0 to 255 to get a color value.
// The colours are a transition r - g - b - back to r.
uint32_t Wheel(byte WheelPos) {
WheelPos = 255 - WheelPos;
if(WheelPos < 85) {
return pixels.Color(255 - WheelPos * 3, 0, WheelPos * 3);
}
if(WheelPos < 170) {
WheelPos -= 85;
return pixels.Color(0, WheelPos * 3, 255 - WheelPos * 3);
}
WheelPos -= 170;
return pixels.Color(WheelPos * 3, 255 - WheelPos * 3, 0);
}
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