A hardware hack to a Rainbowduino 8x8 RGB matrix display allowing it to display power consumption data as big bold colourful graphics. Data received wirelessly from the Open Energy Monitor EmonTx. Ideal for old folks or visually impaired who may struggle

energyRGB.pde

/*
 Rainbowduino v3.0 Library examples:

 Sets pixels on 2D plane (8x8 matrix)

*/

#include <Rainbowduino.h>

uint32_t colorRGB[13] = {0xFFFFFF,0x000000,0xFFFFFF,0x000,0xFF0000,0x00FF00,0x0000FF,0xFF0000,0x00FF00,0x0000FF,0xFF0000,0x00FF00,0x0000FF };

uint32_t colourwhite = 0xFFFFFF;
uint32_t colourgrey = 0x7F7F7F;
uint32_t colourcharcoal = 0x3F3F3F;

// uint32_t colourbrick = 0x1f0F00;
// uint32_t colourroof = 0x2f0F00;
uint32_t colourbrick = 0x1f1f1f;
uint32_t colourroof = 0x1f1f1f;

uint32_t colour0 = 0x0f0F00;
uint32_t colour1 = 0x1f0F00;
uint32_t colour2 = 0x2f0F00;
uint32_t colour3 = 0x3f0F00;
uint32_t colour4 = 0x4f0F00;
uint32_t colour5 = 0x5f0F00;
uint32_t colour6 = 0x6f0F00;
uint32_t colour7 = 0x7f0F00;

unsigned int colour_red = 0;
unsigned int colour_green= 0;
unsigned int colour_blue = 0;

uint32_t colour_palette = 0 ;

// int inByte = 0;         // incoming serial byte
unsigned char x,y,z;

long previousMillis = 0;        // will store last time LED was updated
long interval = 100;           // interval at which to blink (milliseconds)
int wattsDesired = 0000;
int wattsNearest = 0;
int incomingByte = 0;
boolean dataReady = false;
int i = 0;
int len = 4; // expected string is 6 bytes long
char inString[5]; 
char inByte;
char inChar;
int incoming;

 int PWMpin = 3;    // PWM output on pin 3 to MPPT active load
 int PWMval = 0;
 int LEDpin = 5;    // PWM drive to LED driver
 int LEDval = 0;
 int FANpin = 6;    // PWM to fan speed control
 int FANval = 0;
 
 int UPpin = 8;      // Pins for UP and DOWN switches
 int DOWNpin = 9;


int allLamps = B00000000;

byte led1 = 2;
byte led2 = 3;
byte led3 = 4;
byte led4 = 5;
byte led5 = 6;
byte led6 = 7;
byte led7 = 8;
byte led8 = 9;
byte led[] = {
  led1, led2, led3, led4, led5, led6, led7, led8};
byte activeLED = 0;
int temp = 0;
int temp2 = 0;



void setup()
{
  Rb.init();
  
  Serial.begin(9600);      // start serial port at 9600 bps:
  
//  establishContact();  // send a byte to establish contact until receiver responds 
  
  
  // Draw the house

 Rb.drawRectangle(0, 0, 6, 8, colourbrick); // draw a filled rectangle line from (0,0) of length and width 7 pixels
  
   Rb.setPixelXY(6,1,colourroof); //uses R, G and B bytes
//   Rb.setPixelXY(6,2,(0xff),(0xff),(0xFF)); //uses R, G and B bytes
//   Rb.setPixelXY(6,3,(0xff),(0xff),(0xFF)); //uses R, G and B bytes
//   Rb.setPixelXY(6,4,(0xff),(0xff),(0xFF)); //uses R, G and B bytes
//   Rb.setPixelXY(6,5,(0xff),(0xff),(0xFF)); //uses R, G and B bytes
   Rb.setPixelXY(6,6,colourroof); //uses R, G and B bytes
   
//     Rb.setPixelXY(7,1,colourcharcoal); //uses R, G and B bytes
     Rb.setPixelXY(7,2,colourroof); //uses R, G and B bytes
     Rb.setPixelXY(7,3,colourroof); //uses R, G and B bytes
     Rb.setPixelXY(7,4,colourroof); //uses R, G and B bytes
     Rb.setPixelXY(7,5,colourroof); //uses R, G and B bytes
//     Rb.setPixelXY(7,6,colourcharcoal); //uses R, G and B bytes
     
      delay(1000);
      
       Serial.print("Enter Command A-F and number 0 - 255: ");

}


void loop()
{


     
     colour_red= 0; 
     colour_blue=0;
     colour_green=0;
     



 
    
    serialReader();
    
    
    
    
    
    if (dataReady = true) {
      wattsDesired = incoming;
    }


    display_colour();
    
    
  }   //End of loop
 


 int display_colour()
 
 {
  int n=(incoming+256)*30/27;
    
    if(n<=255) {colour_blue = 255 -n; colour_green = n;}
    else { colour_blue = 0;}
  

 //  if(n<=256) {colour_green = n;}
  // else  {colour_green = 0;}
   
   if(n>=256) {colour_red = n - 256; colour_green = 511 -(n);}
   else  {colour_red = 0;}
   
   
   if(n==0) { colour_green = 0; colour_red = 0;}
   
   
    colour_palette = ((65536 * colour_red) + (256*colour_green) + colour_blue);
   
   
   
   Serial.print (colour_red);
   Serial.print ("   ");
   Serial.print (colour_green);
   Serial.print ("   ");
   Serial.print (colour_blue);
   Serial.print ("   ");
   Serial.println (colour_palette);
   
   
   
   
   
   colour_palette = ((65536 * colour_red) + (256*colour_green) + colour_blue);
    Rb.fillRectangle(1, 1, 4, 6, colour_palette); // draw a filled rectangle line from (0,0) of length and width 7 pixels
   
 
  
  }
  


void writeOut () {
  temp = 0;
  byte i = 0;
  byte mask = 0x01;

  while (i < 8) {
    mask = 0x01 << i;
    if (allLamps & mask) {
      digitalWrite(led[i], HIGH);
    }
    else {
      digitalWrite(led[i], LOW);
    }
    i++;
  }
}

int serialReader(){ 
  if  (Serial.available() > 0) { // if there are bytes waiting on the serial port
    inByte = Serial.read(); // read a byte
    delay(10); // *** added to make it work ***

    if (inByte == 13){          //  follow the false code until you get a CR
      dataReady = true;
      inChar = inString[1];     // get the leading character
      inString[1] = 48;          // clear the leading character
      temp = atoi(inString);    // convert ascii to integer
      incoming = temp;

      if (temp > 255) temp = 255;
     
      
      /*
      
       Serial.println(inString[0]);
        Serial.println(inString[1]);
         Serial.println(inString[2]);
         Serial.println(inString[3]);
          Serial.println(inString[4]);
           Serial.println(inString[5]);
      
     */    

  // Action Routines:  Work out the command, the argument and what to do with it
  // Echo the command (verbose form) and value to serial terminal

    switch  (inChar){          //  
    
    case 97:
    
    Serial.print (" Active Load ");
    PWMval = temp;
    analogWrite(PWMpin, PWMval);       // Update the PWM pin
    break;
    
    case 98:
    Serial.print (" Brightness ");
    LEDval = temp;
    analogWrite(LEDpin, LEDval);      // Update the LED brightness
    break;
    
    case 99:
    Serial.print (" Current ");
    
    break;
    
    case 100:
    Serial.print (" Distance ");
    break;
    
    case 101:
    Serial.print (" Echo ");
    break;
    
    case 102:
    Serial.print (" Fan Speed ");
    
    FANval = temp;
    analogWrite(FANpin, FANval);      // Update the fan speed
    
    break;
    
    }
    
    
      
      Serial.println(temp);

      
      inString[0] = 0;
      inString[1] = 0;
      inString[2] = 0;
      inString[3] = 0;
      inString[4] = 0;
      i = 0;
      
      return incoming;
    }
    else dataReady = false;      // No CR seen yet so put digits into array
//    Serial.print(inByte); 


    inString[i] = inByte;
    
   
    
    i++;
 
  
  }


}