Arduino/uno-stats-monitor/monitor_uno.ino

/*
 * UNO Monitor Receiver (4bit LCD Version)
 * kidacro@archamedis.net
 * 
 * Waits for input over serial connection and displays on LCD
 * 
 * Input Schema:
 *  Start char is: '#'
 *  End char is: '@'
 *  2nd char denotes which line number to use
 *  
 * Example:
 *  Line 1: #1Archamedis Status@
 *  Line 2: #299% free / etc.@
 *  
 */

// include the library code:
#include <LiquidCrystal.h>

// LCD Pinout:
// LCD RS pin to digital pin 12
// LCD Enable pin to digital pin 11
// LCD D4 pin to digital pin 5
// LCD D5 pin to digital pin 4
// LCD D6 pin to digital pin 3
// LCD D7 pin to digital pin 2
// LCD R/W pin to ground
// LCD VSS pin to ground
// LCD VCC pin to 5V
// 10K resistor:
// ends to +5V and ground
// wiper to LCD VO pin (pin 3)

// Variable Init
// LCD vars
// initialize the library by associating any needed LCD interface pin
//  with the arduino pin number it is connected to
const int LCDRS = 12, LCDEN = 11, LCDD4 = 5, LCDD5 = 4, LCDD6 = 3, LCDD7 = 2;
int LCDLength = 16;
LiquidCrystal LCD(LCDRS, LCDEN, LCDD4, LCDD5, LCDD6, LCDD7);

// Serial vars
const byte numChars = 32;
char receivedChars[numChars]; // an array to store the received data
boolean newData = false;

// Debugging (serial console must be connected)
bool DEBUG = 1;
 
void LcdSetup(void) {
  // set up the LCD's number of columns and rows:
  LCD.begin(LCDLength, 2);
  
  // Print a "waiting" message to the LCD.
  LcdL1();
  LCD.print("Starting Up...");
  LcdL2();
  LCD.print("Waiting for data");
}

void LcdCls(void) {
  delay(10);
  LCD.clear();  // The screen is empty
  LcdL1(); // the cursor position is zeroed 
  delay(10);
}

void LcdL1() {
  delay(10);
  LCD.setCursor(0, 0); // Define the cursor position as the 1st position of the 1st line
  delay(10);
}

void LcdL2() {
  delay(10);
  LCD.setCursor(0, 1);  // Define the cursor position as the 1st position of the 2nd line
  delay(10); 
}

// returns starting position of text
void LcdCenter(int mylen) {
  int mypos = 0;

  return mypos;
}

void LcdWrite(String mymessage) {
  int i = 0;
  unsigned int mylen = mymessage.length(); 
  
  // trunicate string to lcd line length
  if(mylen > LCDLength) {
    mylen = LCDLength;
  }

  // Debug input and length
  if(DEBUG) {
    Serial.println("\n\nString: ");
    Serial.println(mymessage);
    Serial.println(mymessage.length());
  }

  // Output string
  //LCD.print(mymessage);

  // Output character by character
  for(i=0; i < mylen; i++) {
    char c = mymessage[i];
    if(c != '\b') {
      delay(10);
      LCD.print(c);
      delay(10);
    }
  }
}

void LcdWriteExample() {
  LcdCls();

  LcdL1();
  LcdWrite("Archamedis Stats");

  LcdL2();
  LcdWrite("4.3ghz 89% 68C");
  
}

void recvWithStartEndMarkers() {
    static boolean recvInProgress = false;
    static byte ndx = 0;
    char startMarker = '#';
    char endMarker = '@';
    char rc;
 
    while (Serial.available() > 0 && newData == false) {
        rc = Serial.read();

        if(recvInProgress == true) {
            if(rc != endMarker) {
                receivedChars[ndx] = rc;
                ndx++;
                if (ndx >= numChars) {
                    ndx = numChars - 1;
                }
            }
            else {
                receivedChars[ndx] = '\0'; // terminate the string
                recvInProgress = false;
                ndx = 0;
                newData = true;
            }
        }

        else if(rc == startMarker) {
            recvInProgress = true;
        }
    }
}

void showNewData() {
  if(newData == true) {
    if(DEBUG) {
      Serial.print("This just in ... ");
      Serial.println(receivedChars);
    }

    // Print on line 1 or 2
    // dev: fucking c and its fixed arrays
    //      we have to define 1st character (line number) as BS and when printing, search for that BS character to skip printing that 1 character, grrr
    if(receivedChars[0] == '1') {
      LcdL1();
      LcdWrite("                "); // 16 spaces for a blank line
      LcdL1();
      receivedChars[0] = '\b';
      LcdWrite(receivedChars);
    }
    else if(receivedChars[0] == '2') {
      LcdL2();
      LcdWrite("                "); // 16 spaces for a blank line
      LcdL2();
      receivedChars[0] = '\b';
      LcdWrite(receivedChars);
    }
    
    newData = false;
  }
}

void setup (void) {
  // Init LCD panel
  LcdSetup();

  // Init Debugging output
  if(DEBUG) {
    Serial.begin(9600);
    while (!Serial) {
      ; // wait for serial port to connect. Needed for native USB port only
    }
  }

  // Init normal operation
  else {
    Serial.begin(9600);
  }
  
}

// main()
void loop (void) {
  // process input
  recvWithStartEndMarkers();
  showNewData();
}