Arduino Project 023B - Liquid Crystal Displays -Blink and Cursor
Before wiring the LCD screen to your Arduino board we suggest to solder a pin header strip to the 14 (or 16) pin count connector of the LCD screen, as you can see in the image further up.
To start with, you will create a demonstration project that will show off most of the functions available in the LiquidCrystal.h library. To do so, you’ll use a backlit 16x2 LCD Display.
To wire your LCD screen to your board, connect the following pins:
LCD RS pin to digital pin 9
LCD Enable pin to digital pin 8
LCD D4 pin to digital pin 5
LCD D5 pin to digital pin 4
LCD D6 pin to digital pin 3
LCD D7 pin to digital pin 2
LCD R/W pin to GND
LCD VSS pin to GND
LCD VCC pin to 5V
LCD LED+ to 5V through a 220 ohm resistor
LCD LED- to GND
Project 23B-1 Liquid Crystal Displays -Blink
/* Coding Ron Wang Oct.24th 2024 Autaba support for coding hardware Project 23B Basic LCD Control - Blink */ #include <LiquidCrystal.h> // Initialize the library with the numbers of the interface pins const int rs = 9, en = 8, d4 = 5, d5 = 4, d6 = 3, d7 = 2; LiquidCrystal lcd(rs, en, d4, d5, d6, d7); 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!"); } void loop() { // Turn off the blinking cursor: lcd.noBlink(); delay(3000); // Turn on the blinking cursor: lcd.blink(); delay(3000); }
Project 23B-2 Liquid Crystal Displays -Cursor
/* Coding Ron Wang Oct.25th 2024 Autaba support for coding hardware Project 23C Basic LCD Control- Cursor */ #include <LiquidCrystal.h> // Initialize the library with the numbers of the interface pins const int rs = 9, en = 8, d4 = 5, d5 = 4, d6 = 3, d7 = 2; LiquidCrystal lcd(rs, en, d4, d5, d6, d7); 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!"); } void loop() { // Turn off the cursor: lcd.noCursor(); delay(500); // Turn on the cursor: lcd.cursor(); delay(500); }
Project 23B-3 Liquid Crystal Displays - Set Cursor
/* Coding Ron Wang Oct.27th 2024 Autaba support for coding hardware Project 23E Basic LCD Control- Set Cursor Example */ #include <LiquidCrystal.h> // Initialize the library with the numbers of the interface pins const int rs = 9, en = 8, d4 = 5, d5 = 4, d6 = 3, d7 = 2; LiquidCrystal lcd(rs, en, d4, d5, d6, d7); // these constants won't change. But you can change the size of // your LCD using them: const int numRows = 2; const int numCols = 16; void setup() { // set up the LCD's number of columns and rows: lcd.begin(numCols, numRows); } void loop() { // loop from ASCII 'a' to ASCII 'z': for (int thisLetter = 'a'; thisLetter <= 'z'; thisLetter++) { // loop over the columns: for (int thisRow = 0; thisRow < numRows; thisRow++) { // loop over the rows: for (int thisCol = 0; thisCol < numCols; thisCol++) { // set the cursor position: lcd.setCursor(thisCol, thisRow); // print the letter: lcd.write(thisLetter); delay(200); } } } }
Additionally, wire a 10k potentiometer to +5V and GND, with it's wiper (output) to LCD screens VO pin (pin3).
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