Need help with INT output to LCD

Forum 2005-2010 (read only) Hardware Interfacing
1

I am using OneWire to get temp input and trying to output the value on the LCD screen. So when I output the value using Serial.print(val) it is correct but if I use lcd.print(val) it comes up as a CHAR.

for example:

int val = 70;
Serial.print(val); // outputs 70 to the console
lcd.print(val); // outputs F to the LCD.

I am very new to this and the code i have is all basically found in forums and examples.
here is the loop function I have so far.

Any help is greatly appreciated!!

void loop()
{
  int HighByte, LowByte, TReading, SignBit, Tc_100, Tf_100, Fract;
  float Whole;

  digitalWrite(13, HIGH);  //light the debug LED
  OneWireReset(TEMP_PIN);       // reset
  OneWireOutByte(TEMP_PIN, 0xcc); // skip ROM code
  OneWireOutByte(TEMP_PIN, 0x44); // perform temperature conversion, strong pullup for one sec

  OneWireReset(TEMP_PIN);         // reset
  OneWireOutByte(TEMP_PIN, 0xcc); // skip ROM code
  OneWireOutByte(TEMP_PIN, 0xbe); // Read scratchpad code (temperature in this case)

  LowByte = OneWireInByte(TEMP_PIN);
 
  
  HighByte = OneWireInByte(TEMP_PIN);

  TReading = (HighByte << 8) + LowByte;

  SignBit = TReading & 0x8000;  // test most sig bit
  if (SignBit) // negative
  {
    TReading = (TReading ^ 0xffff) + 1; // 2's complement the answer
  }
  Tc_100 = (6 * TReading) + TReading / 4;    // multiply by (100 * 0.0625) or 6.25

  Whole = Tc_100 / 100;  // separate off the whole and fractional portions
  Fract = Tc_100 % 100;

  if (SignBit) // If its negative
  {
     lcd.printIn("-");
  }
  
  if (Fract < 10)
  {
     //lcd.printIn("0");
  }
  
  //lcd.print("C\n");

  Tf_100 = ((Tc_100 * 9) / 5) + 3200;
  Whole = Tf_100 / 100;  // separate off the whole and fractional portions
  Fract = Tf_100 % 100;

  
  if (SignBit) // If its negative
  {
     lcd.printIn("-");
  }
  lcd.clear();
  lcd.print(Whole);
  Serial.print(Whole);
  Serial.println();
  if (Fract < 10)
  {
     //lcd.printIn("0");
  }
  //lcd.print(Fract);
  
  //scroll entire display 20 chars to left, delaying 50ms each inc
  //lcd.leftScroll(20, 50);
  delay(2000);      // 2 second delay.  Adjust as necessary
  //lcd.clear();
  
}
2

The library you are using does not print numbers, but you can do this:

char buf[6]; // int has up to 5 digits plus terminating 0

int val;
// code here sets val
lcd.printIn(itoa(val, buf, 10));

Also, there is code in this thread that prints floating point values that works with the library you are using: http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1207226548

or you can use the LiuquidCrystal library that has the same print capability as Serial.

3

yeah that bit of code did just the trick! thanks for all the other information too!