Rotary_encoder_and_Alphnumeric_ display.ino

/* 

   Adafruit Seesaw library:  "multiencoder.ino" example; expanded to use Sparkfun Alphanumeric I²C display.
   Modified by William Lucid

 */

#include <Wire.h>
#include "Adafruit_seesaw.h"
#include <seesaw_neopixel.h>
#include <SparkFun_Alphanumeric_Display.h>


HT16K33 display;

#define SS_SWITCH        24      // this is the pin on the encoder connected to switch
#define SS_NEOPIX        6       // this is the pin on the encoder connected to neopixel

#define SEESAW_BASE_ADDR          0x36  // I2C address, starts with 0x36

int result;  //ASCII Character code in decimal

// create 4 encoders!
Adafruit_seesaw encoders[4];
// create 4 encoder pixels
seesaw_NeoPixel encoder_pixels[4] = {
  seesaw_NeoPixel(1, SS_NEOPIX, NEO_GRB + NEO_KHZ800),
  seesaw_NeoPixel(1, SS_NEOPIX, NEO_GRB + NEO_KHZ800),
  seesaw_NeoPixel(1, SS_NEOPIX, NEO_GRB + NEO_KHZ800),
  seesaw_NeoPixel(1, SS_NEOPIX, NEO_GRB + NEO_KHZ800)};

int32_t encoder_positions[] = {0, 0, 0, 0};
bool found_encoders[] = {false, false, false, false};

void setup() {
  Serial.begin(115200);

  // wait for serial port to open
  while (!Serial) delay(10);

  Serial.println("Alphanumeric display + seesaw Encoders test");
  
  Wire.begin();
  
  //check if display will acknowledge
  if (display.begin() == false)
  {
    Serial.println("Device did not acknowledge! Freezing.");
    while(1);
  }
  Serial.println("Display acknowledged.");

  Serial.println("Looking for seesaws!");

  for (uint8_t enc=0; enc<sizeof(found_encoders); enc++) {
    // See if we can find encoders on this address 
    if (! encoders[enc].begin(SEESAW_BASE_ADDR + enc) ||
        ! encoder_pixels[enc].begin(SEESAW_BASE_ADDR + enc)) {
      Serial.print("Couldn't find encoder # ");
      Serial.println(enc);
    } else {
      Serial.print("Found encoder + pixel #");
      Serial.println(enc);
      
      uint32_t version = ((encoders[enc].getVersion() >> 16) & 0xFFFF);
      if (version != 4991){
        Serial.print("Wrong firmware loaded? ");
        Serial.println(version);
        while(1) delay(10);
      }
      Serial.println("Found Product 4991");
  
      // use a pin for the built in encoder switch
      encoders[enc].pinMode(SS_SWITCH, INPUT_PULLUP);

      // get starting position
      encoder_positions[enc] = encoders[enc].getEncoderPosition();
  
      Serial.println("Turning on interrupts");
      delay(10);
      encoders[enc].setGPIOInterrupts((uint32_t)1 << SS_SWITCH, 1);
      encoders[enc].enableEncoderInterrupt();
      
      // set not so bright!
      encoder_pixels[enc].setBrightness(30);
      encoder_pixels[enc].show();

      found_encoders[enc] = true;
    }
  }
 
  Serial.println("Encoders started");
}

void loop() {
	
  for (uint8_t enc=0; enc<sizeof(found_encoders); enc++) { 
     if (found_encoders[enc] == false) continue;
  
     int32_t new_position = encoders[enc].getEncoderPosition();
     // did we move around?
     if (encoder_positions[enc] != new_position) 
       Serial.print("Encoder #");
       Serial.print(enc);
       Serial.print(" -> ");
       Serial.println(new_position);         // display new position
       
       encoder_positions[enc] = new_position;
	  
	     // Code from paulfjujo, on rntlabs.com forum
       	 if (encoder_positions[enc]< 27)
         { 
            result = (65 + encoder_positions[enc]); 
         } else {
            result = (48 + (encoder_positions[enc]-27));
         }

        Serial.print("encoder_positions[enc]:  ");
        Serial.println(encoder_positions[enc]);
        Serial.write(result); //ASCII Char code in decimal
        Serial.println("");
        Serial.println(result);
        
	encoder_positions[enc] = new_position;
        
        char letter = char(result);

        display.printChar(letter, 0);
        display.printChar('O', 1);
        display.printChar('O', 2);
        display.printChar('O', 3);

        display.updateDisplay();       


		// change the neopixel color, mulitply the new positiion by 4 to speed it up
		encoder_pixels[enc].setPixelColor(0, Wheel((new_position*4) & 0xFF));
		encoder_pixels[enc].show();
		
    if (! encoders[enc].digitalRead(SS_SWITCH)) {
      Serial.print("Encoder #");
      Serial.print(enc);
      Serial.println(" pressed");
    }

  }

}

uint32_t Wheel(byte WheelPos) {
  WheelPos = 255 - WheelPos;
  if (WheelPos < 85) {
    return seesaw_NeoPixel::Color(255 - WheelPos * 3, 0, WheelPos * 3);
  }
  if (WheelPos < 170) {
    WheelPos -= 85;
    return seesaw_NeoPixel::Color(0, WheelPos * 3, 255 - WheelPos * 3);
  }
  WheelPos -= 170;
  return seesaw_NeoPixel::Color(WheelPos * 3, 255 - WheelPos * 3, 0);
}