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I'm just trying to print a string onto an LCD display (SparkFun 20x4 SerLCD - RGB Backlight Qwiic). The address of the I²C device is 0x72. I'm using an Arduino Teensy to communicate with the LCD display.

Pin Connections: 
LCD - Arduino
GND - GND (pin 2)
RAW - 3.3V (pin 3)
SDA - A4 / SDA0 (pin 18)
SCL - A5 / SCL0 (pin 19)

#include <Wire.h> 
#include <LiquidCrystal_I2C.h>
int LCD_columns=20;
int LCD_rows=4;
LiquidCrystal_I2C lcd(0x72,LCD_columns,LCD_rows);  // Address, Columns, Rows

void setup(){
  Wire.setClock(10000);
  lcd.init();
  lcd.setCursor(0, 0);
  lcd.print("2");
}

void loop()
{
}

In the attached image lcd.init() just prints the characters up to the 11!! and when the lcd.print("2") is used it printed the random characters and also the 11!!. I'm not sure where to go from here, any help is greatly appreciated. Image of LCD display

0andriy
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Adam Worthington
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1 Answers1

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For anyone wondering, the library LiquidCrystal_I2C.h was incompatible with the LCD I used. Finding the repository on the LCD website provided the correct information. The Wire.h library was all that is needed.

Adam Worthington
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