16x2 LCD with LiquidCrystal library in Arduino - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the '16x2' mean in a 16x2 LCD?

It means the LCD has 16 columns and 2 rows, so it can show 16 characters per line and has 2 lines in total.

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What is the purpose of the LiquidCrystal library in Arduino?

The LiquidCrystal library helps you control LCD screens easily by providing commands to display text, clear the screen, and move the cursor.

beginner

How do you initialize a 16x2 LCD using the LiquidCrystal library?

You create a LiquidCrystal object with the pins connected to the LCD, then call lcd.begin(16, 2) to set the size.

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What does the command lcd.setCursor(0, 1) do?

It moves the cursor to the first column (0) of the second row (1) on the LCD, so the next text will start there.

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How do you print 'Hello' on the LCD using LiquidCrystal?

Use lcd.print("Hello"); after setting the cursor position to display the text on the screen.

What is the correct way to start using a 16x2 LCD with LiquidCrystal?

A lcd.begin(16, 2);

B lcd.start(2, 16);

C lcd.init(2, 16);

D lcd.open(16, 2);

lcd.begin(16, 2); sets the LCD size to 16 columns and 2 rows, which is required before printing.

Which command clears all text from the LCD screen?

A lcd.clear();

B lcd.reset();

C lcd.erase();

D lcd.clean();

lcd.clear(); removes all text from the screen and resets the cursor to the home position.

If you want to print text on the second line, which cursor position should you use?

A lcd.setCursor(1, 1);

B lcd.setCursor(0, 1);

C lcd.setCursor(1, 0);

D lcd.setCursor(0, 0);

Rows start at 0, so the second line is row 1. Column 0 is the first character position.

Which library do you include to use a 16x2 LCD in Arduino?

A #include <LCD.h>

B #include <Display.h>

C #include <LiquidCrystal.h>

D #include <Screen.h>

LiquidCrystal.h is the official Arduino library for controlling LCDs.

What does lcd.print("Hi") do?

A Turns off the LCD.

B Clears the LCD screen.

C Moves the cursor to the start.

D Displays 'Hi' on the LCD at the current cursor position.

lcd.print("Hi") writes the text 'Hi' on the LCD where the cursor is.

Explain how to connect and initialize a 16x2 LCD using the LiquidCrystal library in Arduino.

Think about wiring, code setup, and commands to show text.

Describe the steps to display a message on the second line of a 16x2 LCD using LiquidCrystal.

Remember rows start at 0, so second line is row 1.