How to use the LiquidCrystal library?

1 year ago
Jackson Davis
2 minutes

To use the LiquidCrystal library, you need to complete the following steps:

  1. Include library: at the top of the code, import the LiquidCrystal library using #include .
  2. Initialize the LCD object: In your code, use LiquidCrystal lcd(rs, enable, d4, d5, d6, d7); to initialize a LiquidCrystal object. The rs, enable, and d4-d7 are the pins of the LCD.
  3. Set LCD properties: In the setup() function, use lcd.begin(cols, rows) to specify the number of columns and rows for the LCD. For example, lcd.begin(16, 2) will create an LCD screen with 16 columns and 2 rows.
  4. Displaying text: Use the lcd.print() function to show text on the LCD. For example, lcd.print(“Hello, world!”) will display the text “Hello, world!” on the LCD.
  5. Moving the cursor and clearing the screen: You can use the lcd.setCursor(col, row) function to move the cursor to a specific column and row. For example, lcd.setCursor(0, 1) will move the cursor to the second row of the first column. Use the lcd.clear() function to erase all text on the screen.

Here is an example code using the LiquidCrystal library.

#include <LiquidCrystal.h>

// 初始化LiquidCrystal对象
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

void setup() {
  // 设置LCD属性
  lcd.begin(16, 2);
  
  // 在LCD上显示文本
  lcd.print("Hello, world!");
}

void loop() {
  // 不需要在循环中做任何事情
}

This sample code will display the text “Hello, world!” on a LCD screen with 16 columns and 2 rows.

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