arduino-lcd

// LiquidCrystal_I2C.h: https://github.com/johnrickman/LiquidCrystal_I2C
#include <Wire.h> // Library for I2C communication
#include <LiquidCrystal_I2C.h> // Library for LCD using I2C Adapter
#include <Firmata.h>

// Wiring: SDA pin is connected to A4 and SCL pin to A5.
// Connect to LCD via I2C, default address 0x27 (A0-A2 not jumpered)
LiquidCrystal_I2C lcd = LiquidCrystal_I2C(0x27, 16, 2); // Change to (0x27,20,4) for 20x4 LCD.

int lastLine = 1;

void setup() {
  // Initiate the LCD:
  lcd.init();
  lcd.backlight();
  Firmata.setFirmwareVersion( FIRMATA_MAJOR_VERSION, FIRMATA_MINOR_VERSION );
  Firmata.attach( STRING_DATA, stringDataCallback);
  Firmata.begin();  
}

void stringDataCallback(char *stringData){
   if ( lastLine ) {
     lastLine = 0;
     lcd.clear();
   } else {
     lastLine = 1;
     lcd.setCursor(0,1);
   }
   lcd.print(stringData);
}


void loop() {
  lcd.setCursor(2, 0); // Set the cursor on the third column and first row.
  while ( Firmata.available() ) {
    Firmata.processInput();
  }
}

gistfile1.txt

from pyfirmata import Arduino, util, STRING_DATA
board = Arduino('/dev/ttyACM0')
board.send_sysex( STRING_DATA, util.str_to_two_byte_iter('Sending some text.') )

gistfile2.txt

// LiquidCrystal_I2C.h: https://github.com/johnrickman/LiquidCrystal_I2C
#include <Wire.h> // Library for I2C communication
#include <LiquidCrystal_I2C.h> // Library for LCD using I2C Adapter
#include <Firmata.h>

// Wiring: SDA pin is connected to A4 and SCL pin to A5.
// Connect to LCD via I2C, default address 0x27 (A0-A2 not jumpered)
LiquidCrystal_I2C lcd = LiquidCrystal_I2C(0x27, 16, 2); // Change to (0x27,20,4) for 20x4 LCD.

int lastLine = 1;
char *lastStringData = NULL;


void setup() {
  // Initiate the LCD:
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0); // Set the cursor on the third column and first row.
  Firmata.setFirmwareVersion( FIRMATA_MAJOR_VERSION, FIRMATA_MINOR_VERSION );
  Firmata.attach( STRING_DATA, stringDataCallback);
  Firmata.begin();  
}

void stringDataCallback(char *stringData){
   if ( lastLine ) {
     lcd.clear();
   } else {
     lastLine = 1;
     lcd.setCursor(0,1);
   }
   lcd.print(stringData);

   if (lastStringData != NULL) {
    free(lastStringData);
   }
   lastStringData = ( char* ) malloc(strlen(stringData)+1);
   strcpy(lastStringData, stringData);
}


void loop() {
//  Serial.print(lastStringData);Serial.print("-");Serial.println(strlen(lastStringData));
  while ( Firmata.available() ) {
    Firmata.processInput();
  }
  lcd.scrollDisplayLeft();
  delay(1000);
}