LCD Fails to work when Serial.Begin(9600) is called

Using Arduino Displays
1

Hi All;

I have a sketch which reads in RFIDs and displays some words accordingly. The issue I have is that I have to set serial.begin(9600) for the RFID readers to work (ID-12) which causes the LCD to display garbled data. If I remove the line, then the LCD works just fine but the readers don't.

I even tested this with the Hello World code and got the same result.

#include <LiquidCrystal.h>

#define kLCD_RS 1 //PIN 4 on LCD
#define kLCD_EN 2 //PIN 6 on LCD
#define kLCD_DB4 3 //PIN 11 on LCD
#define kLCD_DB5 4 //PIN 12 on LCD
#define kLCD_DB6 A5 //PIN 13 on LCD
#define kLCD_DB7 A4 //PIN 14 on LCD

// initialize the library with the numbers of the interface pins
//LiquidCrystal lcd(kLCD_RS, kLCD_EN, kLCD_DB4, kLCD_DB5, kLCD_DB6, kLCD_DB7);


// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(kLCD_RS, kLCD_EN, kLCD_DB4, kLCD_DB5, kLCD_DB6, kLCD_DB7);

void setup() {
  // set up the LCD's number of columns and rows: 
  lcd.begin(16, 2);
  // Print a message to the LCD.
  lcd.print("hello, world!");
  Serial.begin(9600);
}

void loop() {
  // set the cursor to column 0, line 1
  // (note: line 1 is the second row, since counting begins with 0):
  lcd.setCursor(0, 1);
  // print the number of seconds since reset:
  lcd.print(millis()/1000);
}

As soon as I remove the serial.being(9600); it works. I am most likely dealing with a baud rate mismatch but I tried all the legal baud rates instead of 9600 and none allowed the LCD to work.

Can anyone offer any insight? Please....!

2

You have connected your LCD RS pin to arduino serial TX (pin 1). Use another pin (Don't use arduino pin 0 either).

3

I didn't spot that right away because I read the comments instead of the code.

Don

4

Thanks guys;

Will give that a go tonight and report back, but it makes sense and kinda kicking myself for not working that out.