LCD functions won't work as intended

Projects Programming
1

Hi guys,

I have a little problem. If i lcd.print("") in setup() it works fine, but if i call the same function in any other place, it doesn't show the intended string, just random characters.

This is the code:

#include <SoftwareSerial.h>
#include <LiquidCrystal.h>

const int rs = 7, en = 8, d4 = 9, d5 = 1, d6 = 2, d7 = 12;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

SoftwareSerial sim(10,11);
int _timeout;
String _buffer;
String number = "+40724330572"; //-> change with your number
void setup() {
// set up the LCD's number of columns and rows:
lcd.begin(16, 2);
// Print a message to the LCD.
lcd.print("s->trimite mesaj");
lcd.setCursor(0, 1);
lcd.print("c->suna");
delay(7000); //delay for 7 seconds to make sure the modules get the signal
Serial.begin(9600);
_buffer.reserve(50);
Serial.println("Sistem Started...");
sim.begin(9600);
delay(1000);
Serial.println("Type s to send an SMS, r to receive an SMS, and c to make a call");

}
void loop() {

if (Serial.available() > 0)

switch (Serial.read())
{
case 's':
SendMessage();
break;
case 'r':
RecieveMessage();
break;
case 'c':
callNumber();
break;
}
if (sim.available() > 0)
Serial.write(sim.read());

}
void SendMessage()
{
//Serial.println ("Sending Message");
sim.println("AT+CMGF=1"); //Sets the GSM Module in Text Mode
delay(1000);
//Serial.println ("Set SMS Number");
sim.println("AT+CMGS="" + number + ""\r"); //Mobile phone number to send message
delay(1000);
String SMS = "Hello, how are you?";
sim.println(SMS);
delay(100);
sim.println((char)26);// ASCII code of CTRL+Z
delay(1000);
_buffer = _readSerial();

}
void RecieveMessage()
{
Serial.println ("SIM800L Read an SMS");

delay (1000);
sim.println("AT+CNMI=2,2,0,0,0"); // AT Command to receive a live SMS
delay(1000);
Serial.write ("Unread Message done");
}
String _readSerial() {
_timeout = 0;
while (!sim.available() && _timeout < 12000 )
{
delay(13);
_timeout++;
}
if (sim.available()) {
return sim.readString();
}
}
void callNumber() {
sim.print (F("ATD"));
sim.print (number);
sim.print (F(";\r\n"));
_buffer = _readSerial();
Serial.println(_buffer);
}

2

Your code only prints to the LCD in setup()

Post a simple example of code that prints to LCD in loop() which does not work

3

I tried this without printing something in setup().

void RecieveMessage()
{
  Serial.println ("SIM800L Read an SMS");

  lcd.print("SIM800L Read an SMS");    // Here !!!!!

  delay (1000);
  sim.println("AT+CNMI=2,2,0,0,0"); // AT Command to receive a live SMS
  delay(1000);
  Serial.write ("Unread Message done");
}
4

Well done.

5

Well done what? :)))...it still doesn t work :frowning:

6

The sketch code in response #2 won't even build. A normal Arduino sketch needs a setup() and a loop() function.
--- bill