LCD Button Writer

Use buttons to type on LCD screen.

Aug 2, 2019

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communication

Devices & Components

Arduino Uno Rev3

16x2 LCD display with I²C interface

\tPush Button

LED (generic)

Resistor 100 ohm

Breadboard (generic)

Jumper wires (generic)

Male/Female Jumper Wires

Project description

Code

Lcdbuttons

arduino

You need the LiquidCrystal_I2C to be able to run it. Download it from here https://github.com/fdebrabander/Arduino-LiquidCrystal-I2C-library

1//Include the LCD Library.
2#include <Wire.h> 
3#include <LiquidCrystal_I2C.h>
4
5LiquidCrystal_I2C   lcd(0x27, 16, 2);
6
7const int buttonPin1 = 2;     // Charachter change button
8const   int buttonPin2 = 3;     // Move button
9const int buttonPin3 = 4;     // Reset   screen button
10const int ledPin1 =  13;      // Charachter change LED pin
11const   int ledPin2 =  12;      // Move LED pin
12const int ledPin3 =  11;      // Reset   LED pin
13const char chars[] = {'A','B','C','D','E','F','G','H','I','J','K','L','M','O','P','Q','R','S','U','V','W','X','Y','Z','.',',','1','2','3','4','5','6','7','8','9','0','-','*','@'};//add   any additional characters
14
15int charindex = 0;
16int buttonState1 = 0;
17int   buttonState2 = 0;
18int buttonState3 = 0;
19int charsSize = 0;
20int cx = 0;
21int   cy = 0;
22
23
24
25void setup() {
26	//init LCD
27  lcd.begin();
28  lcd.clear();
29	lcd.setCursor(0,   0);
30  lcd.blink();  
31	//Charachters array size
32  charsSize = sizeof(chars);
33   //LED init
34  pinMode(ledPin1, OUTPUT);
35  pinMode(ledPin2, OUTPUT);
36  pinMode(ledPin3,   OUTPUT);
37  // initialize the pushbutton pin as an input:
38  pinMode(buttonPin1,   INPUT);
39  pinMode(buttonPin2, INPUT);
40  pinMode(buttonPin3, INPUT);
41  
42}
43
44void   loop() {
45  buttonState1 = digitalRead(buttonPin1);
46  buttonState2 = digitalRead(buttonPin2);
47   buttonState3 = digitalRead(buttonPin3);
48  //
49  if (buttonState1 == HIGH)   {
50    if(charindex == charsSize){
51      charindex = 0;
52    }
53    //   change char and turn led on:
54    digitalWrite(ledPin1, HIGH);
55    lcd.print(chars[charindex]);
56     lcd.setCursor(cx, cy);
57    charindex++;
58  } else {
59    digitalWrite(ledPin1,   LOW);
60  }
61  //Move to next pixel
62  if (buttonState2 == HIGH) {
63    digitalWrite(ledPin2,   HIGH);
64    charindex = 0;
65    cx++;
66    if(cx == 16){
67      cx = 0;
68       cy++;
69    }
70    if(cy == 2){
71      cy = 0;
72    }
73    lcd.setCursor(cx,   cy);
74  }else {
75    digitalWrite(ledPin2, LOW);
76  }
77  //reset
78  if   (buttonState3 == HIGH) {
79    digitalWrite(ledPin3, HIGH);
80    charindex =   0;
81    cx = 0;
82    cy = 0;
83    lcd.setCursor(cx, cy);
84    lcd.clear();
85   }else {
86    digitalWrite(ledPin3, LOW);
87  } 
88  delay(170);
89}
90

//Include the LCD Library.
#include <Wire.h> 
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C   lcd(0x27, 16, 2);

const int buttonPin1 = 2;     // Charachter change button
const   int buttonPin2 = 3;     // Move button
const int buttonPin3 = 4;     // Reset   screen button
const int ledPin1 =  13;      // Charachter change LED pin
const   int ledPin2 =  12;      // Move LED pin
const int ledPin3 =  11;      // Reset   LED pin
const char chars[] = {'A','B','C','D','E','F','G','H','I','J','K','L','M','O','P','Q','R','S','U','V','W','X','Y','Z','.',',','1','2','3','4','5','6','7','8','9','0','-','*','@'};//add   any additional characters

int charindex = 0;
int buttonState1 = 0;
int   buttonState2 = 0;
int buttonState3 = 0;
int charsSize = 0;
int cx = 0;
int   cy = 0;



void setup() {
	//init LCD
  lcd.begin();
  lcd.clear();
	lcd.setCursor(0,   0);
  lcd.blink();  
	//Charachters array size
  charsSize = sizeof(chars);
   //LED init
  pinMode(ledPin1, OUTPUT);
  pinMode(ledPin2, OUTPUT);
  pinMode(ledPin3,   OUTPUT);
  // initialize the pushbutton pin as an input:
  pinMode(buttonPin1,   INPUT);
  pinMode(buttonPin2, INPUT);
  pinMode(buttonPin3, INPUT);
  
}

void   loop() {
  buttonState1 = digitalRead(buttonPin1);
  buttonState2 = digitalRead(buttonPin2);
   buttonState3 = digitalRead(buttonPin3);
  //
  if (buttonState1 == HIGH)   {
    if(charindex == charsSize){
      charindex = 0;
    }
    //   change char and turn led on:
    digitalWrite(ledPin1, HIGH);
    lcd.print(chars[charindex]);
     lcd.setCursor(cx, cy);
    charindex++;
  } else {
    digitalWrite(ledPin1,   LOW);
  }
  //Move to next pixel
  if (buttonState2 == HIGH) {
    digitalWrite(ledPin2,   HIGH);
    charindex = 0;
    cx++;
    if(cx == 16){
      cx = 0;
       cy++;
    }
    if(cy == 2){
      cy = 0;
    }
    lcd.setCursor(cx,   cy);
  }else {
    digitalWrite(ledPin2, LOW);
  }
  //reset
  if   (buttonState3 == HIGH) {
    digitalWrite(ledPin3, HIGH);
    charindex =   0;
    cx = 0;
    cy = 0;
    lcd.setCursor(cx, cy);
    lcd.clear();
   }else {
    digitalWrite(ledPin3, LOW);
  } 
  delay(170);
}

Lcdbuttons

arduino

You need the LiquidCrystal_I2C to be able to run it. Download it from here https://github.com/fdebrabander/Arduino-LiquidCrystal-I2C-library

1//Include the LCD Library.
2#include <Wire.h> 
3#include <LiquidCrystal_I2C.h>
4
5LiquidCrystal_I2C  lcd(0x27, 16, 2);
6
7const int buttonPin1 = 2;     // Charachter change button
8const  int buttonPin2 = 3;     // Move button
9const int buttonPin3 = 4;     // Reset  screen button
10const int ledPin1 =  13;      // Charachter change LED pin
11const  int ledPin2 =  12;      // Move LED pin
12const int ledPin3 =  11;      // Reset  LED pin
13const char chars[] = {'A','B','C','D','E','F','G','H','I','J','K','L','M','O','P','Q','R','S','U','V','W','X','Y','Z','.',',','1','2','3','4','5','6','7','8','9','0','-','*','@'};//add  any additional characters
14
15int charindex = 0;
16int buttonState1 = 0;
17int  buttonState2 = 0;
18int buttonState3 = 0;
19int charsSize = 0;
20int cx = 0;
21int  cy = 0;
22
23
24
25void setup() {
26	//init LCD
27  lcd.begin();
28  lcd.clear();
29	lcd.setCursor(0,  0);
30  lcd.blink();  
31	//Charachters array size
32  charsSize = sizeof(chars);
33  //LED init
34  pinMode(ledPin1, OUTPUT);
35  pinMode(ledPin2, OUTPUT);
36  pinMode(ledPin3,  OUTPUT);
37  // initialize the pushbutton pin as an input:
38  pinMode(buttonPin1,  INPUT);
39  pinMode(buttonPin2, INPUT);
40  pinMode(buttonPin3, INPUT);
41  
42}
43
44void  loop() {
45  buttonState1 = digitalRead(buttonPin1);
46  buttonState2 = digitalRead(buttonPin2);
47  buttonState3 = digitalRead(buttonPin3);
48  //
49  if (buttonState1 == HIGH)  {
50    if(charindex == charsSize){
51      charindex = 0;
52    }
53    //  change char and turn led on:
54    digitalWrite(ledPin1, HIGH);
55    lcd.print(chars[charindex]);
56    lcd.setCursor(cx, cy);
57    charindex++;
58  } else {
59    digitalWrite(ledPin1,  LOW);
60  }
61  //Move to next pixel
62  if (buttonState2 == HIGH) {
63    digitalWrite(ledPin2,  HIGH);
64    charindex = 0;
65    cx++;
66    if(cx == 16){
67      cx = 0;
68      cy++;
69    }
70    if(cy == 2){
71      cy = 0;
72    }
73    lcd.setCursor(cx,  cy);
74  }else {
75    digitalWrite(ledPin2, LOW);
76  }
77  //reset
78  if  (buttonState3 == HIGH) {
79    digitalWrite(ledPin3, HIGH);
80    charindex =  0;
81    cx = 0;
82    cy = 0;
83    lcd.setCursor(cx, cy);
84    lcd.clear();
85  }else {
86    digitalWrite(ledPin3, LOW);
87  } 
88  delay(170);
89}
90

//Include the LCD Library.
#include <Wire.h> 
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C  lcd(0x27, 16, 2);

const int buttonPin1 = 2;     // Charachter change button
const  int buttonPin2 = 3;     // Move button
const int buttonPin3 = 4;     // Reset  screen button
const int ledPin1 =  13;      // Charachter change LED pin
const  int ledPin2 =  12;      // Move LED pin
const int ledPin3 =  11;      // Reset  LED pin
const char chars[] = {'A','B','C','D','E','F','G','H','I','J','K','L','M','O','P','Q','R','S','U','V','W','X','Y','Z','.',',','1','2','3','4','5','6','7','8','9','0','-','*','@'};//add  any additional characters

int charindex = 0;
int buttonState1 = 0;
int  buttonState2 = 0;
int buttonState3 = 0;
int charsSize = 0;
int cx = 0;
int  cy = 0;



void setup() {
	//init LCD
  lcd.begin();
  lcd.clear();
	lcd.setCursor(0,  0);
  lcd.blink();  
	//Charachters array size
  charsSize = sizeof(chars);
  //LED init
  pinMode(ledPin1, OUTPUT);
  pinMode(ledPin2, OUTPUT);
  pinMode(ledPin3,  OUTPUT);
  // initialize the pushbutton pin as an input:
  pinMode(buttonPin1,  INPUT);
  pinMode(buttonPin2, INPUT);
  pinMode(buttonPin3, INPUT);
  
}

void  loop() {
  buttonState1 = digitalRead(buttonPin1);
  buttonState2 = digitalRead(buttonPin2);
  buttonState3 = digitalRead(buttonPin3);
  //
  if (buttonState1 == HIGH)  {
    if(charindex == charsSize){
      charindex = 0;
    }
    //  change char and turn led on:
    digitalWrite(ledPin1, HIGH);
    lcd.print(chars[charindex]);
    lcd.setCursor(cx, cy);
    charindex++;
  } else {
    digitalWrite(ledPin1,  LOW);
  }
  //Move to next pixel
  if (buttonState2 == HIGH) {
    digitalWrite(ledPin2,  HIGH);
    charindex = 0;
    cx++;
    if(cx == 16){
      cx = 0;
      cy++;
    }
    if(cy == 2){
      cy = 0;
    }
    lcd.setCursor(cx,  cy);
  }else {
    digitalWrite(ledPin2, LOW);
  }
  //reset
  if  (buttonState3 == HIGH) {
    digitalWrite(ledPin3, HIGH);
    charindex =  0;
    cx = 0;
    cy = 0;
    lcd.setCursor(cx, cy);
    lcd.clear();
  }else {
    digitalWrite(ledPin3, LOW);
  } 
  delay(170);
}

Downloadable files

type letters to I2C screen with push buttons

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