Introduction: Arduino UNO(creating Menus and Functions)
In this instructable we will be exploring how to create menus, read temperature from a TC74A0 sensor and display "values"(in this case cellphone numbers) in a manner which is infinite, but limited to the arduino's on board memory.
We will be using
-Arrays
-Liquid crystal display
-Keypad
User guide included in the final step.
Step 1: Components
Arduino Uno
· 4x4 keypad
· TC74A0 digital temperature sensor
· I2c 16x2 LCD Module
· 16x2 liquid crystal display
· Jumper wires
· Breadboard
· Personal computer
· Arduino IDE
· Transfer cable
Step 2: Component Wiring
TEMP SENSOR AND LCD CONNECTED ON SAME LINE TO SDA AND SCL (A4,A5)
LCD (I2c Module)
o SDA to A5 on Arduino
o SCL to A4 on Arduino
o VCC to 5V on Arduino
o GND to GND on Arduino
· 4 x 4 Keypad
o Pin 1 – 8 on Keypad connected to pin 9 – 2 on Arduino respectively
TC74A0 temp sensor
o TC74A0 pin 2 to SDA on Arduino
o TC74A0 pin 3 to GND on Arduino
o TC74A0 pin 4 to SCL on Arduino
o TC74A0 pin 5 to 5V on Arduino
Step 3: Code
#include //Includes libraries when compiling
#include
#include
#define Password_Lenght 5
#define Command_Lenght 3
#define CellNumber 10
int users = 0;
int Display = 0;
int address= 72; //tc74a0 ADDRESS
int I = 0 ;
int USER ;
int X = 0;
int XY = 0 ;
int temp;
int tempPre = 0;
char userNum[10][10] = {{}, {}, {}};
char Data[Password_Lenght];
char Master[Password_Lenght] = "5466"; //PASSWORD
char ExitData[Command_Lenght]; //
char Master1[Command_Lenght] = "**" ;//
char MenuItem;
char CELLArrayA[10] ;
char CELLArrayB[10] ;
char CELLArrayC[10] ;
const byte ROWS = 4; //four rows
const byte COLS = 4; //four columns
byte rowPins[ROWS] = {5, 4, 3, 2};
byte colPins[COLS] = {9, 8, 7, 6};
byte data_count = 0, master_count = 0;
bool Pass_is_good;
LiquidCrystal_I2C lcd(0x26,16,2);
char hexaKeys[ROWS][COLS] = //INITIATING KEYPAD
{
{'1','2','3','A'},
{'4','5','6','B'},
{'7','8','9','C'},
{'*','0','#','D'}
};
Keypad customKeypad = Keypad( makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS);
void setup()
{
Serial.begin(9600); //this creates the Serial Monitor
Wire.begin(); //this creates a Wire object
lcd.begin(16,2);
lcd.backlight();
lcd.clear();
lcd.setCursor(0,0);
lcd.print("Please Wait 3"); //LOADING SCREEN
delay(1000);
lcd.clear();
lcd.setCursor(0,0);
lcd.print("Please Wait 2");
delay(1000);
lcd.clear();
lcd.setCursor(0,0);
lcd.print("Please Wait 1");
delay(300);
lcd.clear();
String myString = "ARDUINO INSTRUCTABLE";
lcd.setCursor(2,2);
lcd.print(myString);
delay(2500);
for(int scrollCounter=0;scrollCounter<24;scrollCounter++)
{
lcd.scrollDisplayLeft();
delay(300);
}
lcd.clear();
lcd.print("Enter Password");
}
void loop()
{
switch(Display) //WHERE IN THE MAIN MENU ARE WE
{ //DID THE USER PRESS A,B,C,D
case 0:
{
Password();
}
break;
case 1:
{
lcd.clear();
lcd.setCursor(0,1);
lcd.print("A B C D");
lcd.setCursor(0,0);
lcd.print("Main Menu");
Display = 2 ;
delay(100);
break;
}
case 2:
{
char customKey = customKeypad.getKey();
switch(customKey)
{
case 'A':
{
Serial.println("A was pressed");
StoreUser();
break;
}
case 'B':
{
Serial.println("B was pressed");
if (users == 0) {
lcd.clear();
lcd.print("NO SAVED USERS");
delay(3000);
lcd.clear();
Display = 1 ;
break;
}
DisplayUsers(); break;
}
case 'C':
{
Serial.println("C was pressed"); //USED DURING TESTING
int ext = 0;
while (!ext) {
char ch;
temp = TempMenu();
if (temp != tempPre) {
lcd.clear();
lcd.print("Temparature");
lcd.setCursor(0, 1);
lcd.print(temp);
lcd.print(" C");
tempPre = temp;
delay(500);
}
ch = customKeypad.getKey();
if (ch == '*') //EXIT TEMPERATURE MENU (if * PRESSED)
{
ext = 1;
lcd.clear();
Display = 1 ;
}
}
break;
TempMenu();
break;
}
case 'D':
{
lcd.clear();
lcd.setCursor(0,0);
lcd.print("NUA PRAC");
lcd.setCursor(0,1);
lcd.print("JB SCHOEMAN");
delay(3000);
lcd.clear();
lcd.setCursor(0,0);
lcd.print("MAY 2019");
lcd.setCursor(0,1);
lcd.print("CC OOSTHUIZEN");
delay(3000);
lcd.clear();
Display = 1 ;
}
}
}
}
}
// CUSTOM FUNCTIONS TO CALL VALUES OR PROCEDURES
void Password()
{
char customKey = customKeypad.getKey();
if (customKey) // makes sure a key is actually pressed, equal to (customKey != NO_KEY)
{
Data[data_count] = customKey; // store char into data array
lcd.setCursor(data_count,1); // move cursor to show each new char
lcd.print("*"); // print char at said cursor
data_count++; // increment data array by 1 to store new char, also keep track of the number of chars entered
}
if(data_count == Password_Lenght-1) // if the array index is equal to the number of expected chars, compare data to master
{
lcd.clear();
lcd.setCursor(0, 0);
lcd.print("Password is ");
if(!strcmp(Data, Master)) // equal to (strcmp(Data, Master) == 0)
{
lcd.print("Good");
lcd.clear();
Display = 1 ;
}
else
lcd.print("Bad");
delay(1000);// added 1 second delay to make sure the password is completely shown on screen before it gets cleared.
lcd.clear();
clearData();
lcd.clear();
lcd.setCursor(0,0);
lcd.print("Enter Password");
}
}
int TempMenu()
{
Wire.beginTransmission(address);
Wire.write(0);
Wire.endTransmission();
Wire.requestFrom(address, 1);
while (Wire.available() == 0);
int c = Wire.read();
return c;
}
void clearData()
{
while(data_count !=0)
{ // This can be used for any array size,
Data[data_count--] = 0; //clear array for new data
}
}
void StoreUser()
{
int ext = 0;
int user;
char ch;
while (!ext) {
lcd.clear();
lcd.print("Enter User");
user = users + 1;
lcd.print(user);
int x = 0;
while (!x) {
for (int i = 0; i < 10; i++) {
ch = customKeypad.waitForKey();
lcd.setCursor(i, 1);
lcd.print(ch);
userNum[user - 1][i] = ch;
}
delay(500);
lcd.clear();
lcd.print("Continue");
lcd.setCursor(0, 1);
lcd.print("* yes # no");
ch = customKeypad.waitForKey();
if (ch == '*') {
x = 1;
}
if (ch == '#') {
x = 1;
ext = 1;
lcd.clear();
Display = 1 ;
}
}
users++;
}
}
void DisplayUsers()
{
lcd.clear();
for (int i = 0; i < users; i++) {
lcd.print("Saved User");
lcd.print(i + 1);
for (int u = 0; u < 10; u++) {
lcd.setCursor(u, 1);
lcd.print(userNum[i][u]);
}
delay(2000);
lcd.clear();
Display = 1 ;
}
}
Attachments
Step 4: USER GUIDE
1. Upon switching on the project, a loading or welcome screen will appear.
2. An “Enter Password” screen will appear, this screen allows you to enter 4 characters, letters or numbers, the correct password is: 5466, this will grant you access to the main menu.
3. Upon entering the correct password, the main menu will appear with 4 possible options to navigate the different available functions.
· A – Enter user cell phone numbers.
o Enter 10 digits to save a user to the system
o After 10 digits have been entered press “ * “ to add more users, or press “#” to exit back to the main menu
· B – Display saved users
o The users will scroll past the screen, they are displayed for 3 seconds each, as soon as all users are displayed the page will close and return to the main menu.
o If no users were added in menu option A, it will display “ NO SAVED USERS”.
· C – Displays live temperature
o Press “ * “ to exit back to main menu
· D – Display short text
o Displays the creator’s name and the subject it was compiled for with a date.
