Hi,

I've just started with MySensors, and am trying to get my first sketch working.
I have an LCD display that I want to update from my Vera by setting V_VAR1 to V_VAR4.

This is my sketch:

#define SN "LCD Display"
#define SV "1.0"
#define NODE_ID 10

#include <MySensor.h> 
#include <SPI.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>

MySensor gw;

static int backlight = 0;
MyMessage backlightMsg(0, V_LIGHT);
MyMessage var1text(0, V_VAR1);
MyMessage var2text(0, V_VAR2);
MyMessage var3text(0, V_VAR3);
MyMessage var4text(0, V_VAR4);

LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE);
//LiquidCrystal_I2C lcd(0x27); //set the LCD address to 0x27 for a 16 chars and 2 line display

void setup()
{
  Serial.begin(9600);  // Used to type in characters
  lcd.begin(20,4);

  // ------- Quick 3 blinks of backlight  -------------
  for(int i = 0; i< 3; i++)
  {
    lcd.backlight();
    delay(250);
    lcd.noBacklight();
    delay(250);
  }
  lcd.backlight(); // finish with backlight on  

  lcd.setCursor(0,0); //Start at character 4 on line 0
  lcd.print("   MySensors LCD    ");
  delay(1000);
  lcd.setCursor(0,2);
  lcd.print("Waiting for gateway");
  
  Serial.println( SN ); 
  gw.begin( incomingMessage, NODE_ID );
  gw.present( 0, S_LIGHT );
  gw.sendSketchInfo(SN, SV);
  // Pull the gateway's light status
  gw.request( 0, V_STATUS );
  gw.request( 0, V_VAR1 );
  gw.request( 0, V_VAR2 );
  gw.request( 0, V_VAR3 );
  gw.request( 0, V_VAR4 );
  

}/*--(end setup )---*/


void loop()
{
  gw.process();
}

void incomingMessage(const MyMessage &message) {
  if (message.type == V_STATUS) {
    
    //  Retrieve on/off from the incoming request message
    int backlight = atoi( message.data );

    if (backlight){
      lcd.backlight();
    }
    else {
      lcd.noBacklight();
    }

    }
  if (message.type == V_VAR1) {
    String lcdtext = String(message.data);
    updateLCDRow(0, lcdtext);
  }

  if (message.type == V_VAR2) {
    String lcdtext = String(message.data);
    updateLCDRow(1, lcdtext);
  }

  if (message.type == V_VAR3) {
    String lcdtext = String(message.data);
    updateLCDRow(2, lcdtext);
  }

  if (message.type == V_VAR4) {
    String lcdtext = String(message.data);
    updateLCDRow(3, lcdtext);
  }
}

void updateLCDRow(int row, String text) {
  lcd.setCursor(0,row);
  lcd.print("                    ");
  lcd.setCursor(0,row);
  lcd.print(text);
}

The problem is that changing the variables in Vera doesn't update the LCD (only once during setup). Do I have to do a gw.request() in the loop in order to get the data? That seems a bit inefficient...
Is it possible to push the data?

That totally makes sense.
I have come to the conclusion that I will probably let my Vera push the info to the LCD node.

Hi all, first post from me.

As I have understood, it is possible for sensor A to fetch values from sensor B. Can someone provide an example of how that is done?
My goal is to create a sensor that has an LCD connected that will display the temperature from other sensors (preferably both MySensor and z-wave).