RF message to LCD

Using Arduino Project Guidance
#1

Hi guys; i’m trying a simple thing actually but I’ve been testing and on here looking for answers for hours.

I want to display the message sent by RF module on the LCD.

Got the RF working, message is sent and received.
Got the display working, first line is filled with a value.
I can also display the received message in de debugging serial monitor.
but how can I display this value on the second line on the LCD?

Transmitter code which is working fine:

// Transmitter setup
// WRL-10534 PIN1=GND PIN2=DATA PIN3=5V PIN4=ANT
// ARDUINO UNO PIN12=DATA PIN13=LED
// Sends plain text message to 434MHz

  #include <VirtualWire.h>

void setup()
{
    Serial.begin(9600);	  // Debugging only
    Serial.println("setup");

    // Initialise the IO and ISR
    vw_set_ptt_inverted(true); // Required for DR3100
    vw_setup(2000);	 // Bits per sec
}

void loop()
{
    const char *msg = "hello";

    digitalWrite(13, true); // Flash a light to show transmitting
    vw_send((uint8_t *)msg, strlen(msg));
    vw_wait_tx(); // Wait until the whole message is gone
    digitalWrite(13, false);
    Serial.println(msg);
    delay(2000);
}

Receiver code which has RF receiving and LCD working

// Receiver setup
// WRL-10532 PIN1=GND PIN2=DATA PIN4=5V PIN8=ANT
// ARDUINO UNO PIN2=DATA PIN13=LED
// Receives plain text message from 434MHz

#include <VirtualWire.h>
#include <LiquidCrystal.h>
LiquidCrystal lcd(12, 11, 5, 4, 3, 10);

int Sensor1Data;
char Sensor1CharMsg[24];

void setup()
{
    pinMode(13,OUTPUT);
    digitalWrite(13,LOW);
  
    lcd.begin(16, 2);
    lcd.print("line1");

    Serial.begin(9600);	// Debugging only
    Serial.println("setup");

    // Initialise the IO and ISR
    vw_set_ptt_inverted(true); // Required for DR3100
    vw_setup(2000);	 // Bits per sec
    vw_set_rx_pin(2);
    vw_rx_start();       // Start the receiver PLL running
}

void loop()
{
    uint8_t buf[VW_MAX_MESSAGE_LEN];
    uint8_t buflen = VW_MAX_MESSAGE_LEN;

    if (vw_get_message(buf, &buflen)) // Non-blocking
    {
	int i;
        digitalWrite(13, true); // Flash a light to show received good message
	// Message with a good checksum received, dump it.
	Serial.print("Got: ");
	
	for (i = 0; i < buflen; i++)
	{
           Serial.print((char) buf[i]);
     	}
	Serial.println("");
        digitalWrite(13, false);
    }
}

Please show me how to display the message on the LCD.

Thanks in advance!

#2

Not a coder, but try this.

lcd.setCursor(0, 1); // first character, second row
lcd.print((char) buf[i]);
#3

Tried it: but where do I locate it?
The void loop is a reocurring program running frequently and doesn't even have time to display the value at a condition.
Delay is also no possible imo
and locate that part in the setup then you don't have that message content available.

#4

Do you want to replace Serial.print with this, or have both.
Leo..

#5

Wawa:
Do you want to replace Serial.print with this, or have both.
Leo..

Serial print is for debugging only

#6

Put it w

paradoxlnx:
Tried it: but where do I locate it?
The void loop is a reocurring program running frequently and doesn’t even have time to display the value at a condition.
Delay is also no possible imo
and locate that part in the setup then you don’t have that message content available.

Put it in here - if that code is running, then the condition is true and there’s a new message. And if it’s not true, the code won’t run.

if (vw_get_message(buf, &buflen)) // Non-blocking
    {
	int i;
        digitalWrite(13, true); // Flash a light to show received good message
	// Message with a good checksum received, dump it.
	Serial.print("Got: ");
	
	for (i = 0; i < buflen; i++)
	{
           Serial.print((char) buf[i]);
     	}
	Serial.println("");
        digitalWrite(13, false);
    }

Also - I think you can use delay() with VW - delay() doesn’t prevent interrupts. Not that I think this is an appropriate time to use it. The delay() at the end of loop is usually not a good thing.

#7 
 lcd.begin(16, 2);
    lcd.print("line1");

the second for the second line of the display should go here:

for (i = 0; i < buflen; i++)
 {
           Serial.print((char) buf[i]);
            [LCD SECOND LINE CODE]
     }
 Serial.println("");
        digitalWrite(13, false);
#8