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The 'Arduino LCD Playground' app for Android creates an interactive learning and prototyping environment to control a 1602 LCD using Bluetooth communication.
Send characters and commands to the LCD display and watch your changes in real-time. No more needing to flash an Arduino Sketch every time you would like to test a simple change to your LCD practice code!
Ideal for beginners who are learning about LCD programming, LCD program planning, or just some all-round good fun for anyone.
Final Setup
Currently only works with a compatible 16x2 LCD module but I hope to add 16x4 and 20x4 modules in the near future as well as the I2C adapter.
More details about this project can be found on the website at: https://installtekz.com/ArduinoLCD
This app along with it's companion sketch utilizes the Arduino 'LiquidCrystal' library.
*Send text strings
*Create your very own custom characters and save/delete them in the app
*Includes preset characters such as smiley, battery status, heart, arrows etc.
*Send commands include changing column/row cursor position, clear screen, show/hide block/underline cursor, switch display on/off
*Sketch code snippets
*moving characters left/right across the display
*Auto scroll characters
*output direction left-to-right, and right-to-left
*Available in 9 languages.
Arduino LCD Playground companion sketch V1.0
C/C++Please note that this version may change over time and the latest version will be on the website at: http://installtekz.com/ArduinoLCD
#include <LiquidCrystal.h>
// Sketch Version 1.0
// Campatable with Arduino LCD Playground Version 1.0 (Version number can be found in the 'Settings' screen of the app)
//
// This Arduino sketch is the companion sketch to the 'Bluetooth Arduino LCD Playground' App for Android devices (Both created by installtekz.com)
// Control a 16x2 LCD display on Arduino Uno via Android over Bluetooth communication.
//
// The standard LiquidCrystal library works with all LCD displays that are compatible with the Hitachi HD44780 driver and you can usually identify them by the 16-pin interface
//
// You are free to do as you wish with this code.
// ################################################### Incoming Text Strings From The Arduino LCD Playground App: #####################################
// TEXTd - example: "Hellod"
// DECIMAL_AS_STRINGb - example: "31,31,31,31,31,31,31,31b"
// Resetr
// Beginc
// ClearScreenc
// Displayc
// NoDisplayc
// ShowCursorONc
// ShowCursorOFFc
// CursorBlockc
// CursorBlinkOFFc
// LCDhomec
// Autoscrollc
// NoAutoscrollc
// LeftToRightc
// RightToLeftc
// Scroll display (Left or Right), (number of positions), (time interval in milliseconds) # as a separator - example: ScrollDisplayRight#3#150c
// set cursor example: SetCursor0,0c
// #################################################################################################################################################
//Initialize the LCD with the arduino. LiquidCrystal(rs, enable, d4, d5, d6, d7)
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
String inbound;
char lastchar;
int createdChars = 0;
void initializeLCD() {
lcd.begin(16, 2);
}
void setup() {
Serial.begin(9600);
initializeLCD();
}
void loop() {
while(Serial.available()) {
delay(50);
char c=Serial.read();
lastchar=c;
inbound+=c;
}
if (inbound.length()>0) {
//strip the last character (control data) from "inbound" string
inbound.remove(inbound.length()-1);
//############### Display Text ######################
if (lastchar == 'd') {
lcd.print(inbound);
}
//############### Create Characters #################
else if
(lastchar == 'b') { // Example: 31,31,31,31,31,31,31,31b
int valA = 0;
int valB = 0;
int valC = 0;
int valD = 0;
int valE = 0;
int valF = 0;
int valG = 0;
int valH = 0;
String valMixed = "";
for (int i = 0; i < inbound.length(); i++) {
if (inbound.substring(i, i+1) == ",") {
valA = inbound.substring(0, i).toInt();
valMixed = inbound.substring(i+1);
break;
}
}
for (int i = 0; i < valMixed.length(); i++) {
if (valMixed.substring(i, i+1) == ",") {
valB = valMixed.substring(0, i).toInt();
valMixed = valMixed.substring(i+1);
break;
}
}
for (int i = 0; i < valMixed.length(); i++) {
if (valMixed.substring(i, i+1) == ",") {
valC = valMixed.substring(0, i).toInt();
valMixed = valMixed.substring(i+1);
break;
}
}
for (int i = 0; i < valMixed.length(); i++) {
if (valMixed.substring(i, i+1) == ",") {
valD = valMixed.substring(0, i).toInt();
valMixed = valMixed.substring(i+1);
break;
}
}
for (int i = 0; i < valMixed.length(); i++) {
if (valMixed.substring(i, i+1) == ",") {
valE = valMixed.substring(0, i).toInt();
valMixed = valMixed.substring(i+1);
break;
}
}
for (int i = 0; i < valMixed.length(); i++) {
if (valMixed.substring(i, i+1) == ",") {
valF = valMixed.substring(0, i).toInt();
valMixed = valMixed.substring(i+1);
break;
}
}
for (int i = 0; i < valMixed.length(); i++) {
if (valMixed.substring(i, i+1) == ",") {
valG = valMixed.substring(0, i).toInt();
valMixed = valMixed.substring(i+1);
break;
}
}
valH = valMixed.toInt();
byte byte1 = (byte) valA;
byte byte2 = (byte) valB;
byte byte3 = (byte) valC;
byte byte4 = (byte) valD;
byte byte5 = (byte) valE;
byte byte6 = (byte) valF;
byte byte7 = (byte) valG;
byte byte8 = (byte) valH;
if (createdChars == 0) {
createdChars = 1;
byte char1[8] = {
byte1,
byte2,
byte3,
byte4,
byte5,
byte6,
byte7,
byte8
};
lcd.createChar(0, char1);
}
else if (createdChars == 1) {
createdChars = 2;
byte char2[8] = {
byte1,
byte2,
byte3,
byte4,
byte5,
byte6,
byte7,
byte8
};
lcd.createChar(1, char2);
}
else if (createdChars == 2) {
createdChars = 3;
byte char3[8] = {
byte1,
byte2,
byte3,
byte4,
byte5,
byte6,
byte7,
byte8
};
lcd.createChar(2, char3);
}
else if (createdChars == 3) {
createdChars = 4;
byte char4[8] = {
byte1,
byte2,
byte3,
byte4,
byte5,
byte6,
byte7,
byte8
};
lcd.createChar(3, char4);
}
else if (createdChars == 4) {
createdChars = 5;
byte char5[8] = {
byte1,
byte2,
byte3,
byte4,
byte5,
byte6,
byte7,
byte8
};
lcd.createChar(4, char5);
}
else if (createdChars == 5) {
createdChars = 6;
byte char6[8] = {
byte1,
byte2,
byte3,
byte4,
byte5,
byte6,
byte7,
byte8
};
lcd.createChar(5, char6);
}
else if (createdChars == 6) {
createdChars = 7;
byte char7[8] = {
byte1,
byte2,
byte3,
byte4,
byte5,
byte6,
byte7,
byte8
};
lcd.createChar(6, char7);
}
else if (createdChars == 7) {
createdChars = 8;
byte char8[8] = {
byte1,
byte2,
byte3,
byte4,
byte5,
byte6,
byte7,
byte8
};
lcd.createChar(7, char8);
}
}
//############## Display Characters #################
else if
(lastchar == 'a'){
if (inbound == "Char1") {
lcd.write(byte(0));
}
else if (inbound == "Char2") {
lcd.write(byte(1));
}
else if (inbound == "Char3") {
lcd.write(byte(2));
}
else if (inbound == "Char4") {
lcd.write(byte(3));
}
else if (inbound == "Char5") {
lcd.write(byte(4));
}
else if (inbound == "Char6") {
lcd.write(byte(5));
}
else if (inbound == "Char7") {
lcd.write(byte(6));
}
else if (inbound == "Char8") {
lcd.write(byte(7));
}
}
//############## Reset Characters #################
else if
(lastchar == 'r') {
createdChars = 0;
byte *char1=malloc(10*sizeof(byte));
free(char1);
byte *char2=malloc(10*sizeof(byte));
free(char2);
byte *char3=malloc(10*sizeof(byte));
free(char3);
byte *char4=malloc(10*sizeof(byte));
free(char4);
byte *char5=malloc(10*sizeof(byte));
free(char5);
byte *char6=malloc(10*sizeof(byte));
free(char6);
byte *char7=malloc(10*sizeof(byte));
free(char7);
byte *char8=malloc(10*sizeof(byte));
free(char8);
initializeLCD();
}
//############## Process Commands ##################
else if
(lastchar == 'c') {
if
(inbound == "Begin"){
initializeLCD();
}
else if
(inbound == "ClearScreen"){
lcd.clear();
}
else if
(inbound == "Display"){
lcd.display();
}
else if
(inbound == "NoDisplay"){
lcd.noDisplay();
}
else if
(inbound == "ShowCursorON"){
lcd.cursor();
}
else if
(inbound == "ShowCursorOFF"){
lcd.noCursor();
}
else if
(inbound == "CursorBlock"){
lcd.blink();
}
else if
(inbound == "CursorBlinkOFF"){
lcd.noBlink();
}
else if
(inbound == "LCDhome"){
lcd.home();
}
else if
(inbound == "Autoscroll"){
lcd.autoscroll();
}
else if
(inbound == "NoAutoscroll"){
lcd.noAutoscroll();
}
else if
(inbound == "LeftToRight"){ // Direction of text (left to right)
lcd.leftToRight();
}
else if
(inbound == "RightToLeft"){ // Direction of text (right to left)
lcd.rightToLeft();
}
else if
(inbound.startsWith("ScrollDisplayLeft")){ // Example of incoming: scrollDisplayLeft#3#150 (#, 1-100 (number of positions), #, delay in milliseconds)
String mixedVal;
int positions, interval;
mixedVal=inbound.substring(18); //3#150
for (int i = 0; i < mixedVal.length(); i++) {
if (mixedVal.substring(i, i+1) == "#") {
positions = mixedVal.substring(0, i).toInt();
interval = mixedVal.substring(i+1).toInt();
break;
}
}
for (int positionCounter = 0; positionCounter < positions; positionCounter++) {
lcd.scrollDisplayLeft();
delay(interval);
}
}
else if
(inbound.startsWith("ScrollDisplayRight")){ // Example of incoming: scrollDisplayRight#3#150 (#, 1-100 (number of positions), #, delay in milliseconds)
String mixedVal1;
int positions1, interval1;
mixedVal1=inbound.substring(19); // Example: 3#150
for (int i = 0; i < mixedVal1.length(); i++) {
if (mixedVal1.substring(i, i+1) == "#") {
positions1 = mixedVal1.substring(0, i).toInt();
interval1 = mixedVal1.substring(i+1).toInt();
break;
}
}
for (int positionCounter = 0; positionCounter < positions1; positionCounter++) {
lcd.scrollDisplayRight();
delay(interval1);
}
}
else if
(inbound.startsWith("SetCursor")){
String setCursorRaw = inbound.substring(9);
int cursorColumn = 0;
int cursorRow = 0;
for (int i = 0; i < setCursorRaw.length(); i++) {
if (setCursorRaw.substring(i, i+1) == ",") {
cursorColumn = setCursorRaw.substring(0, i).toInt();
cursorRow = setCursorRaw.substring(i+1).toInt();
break;
}
}
lcd.setCursor(cursorColumn,cursorRow);
}
}
}
//###########################################
inbound="";
lastchar="";
}
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