I am bogged down in this project
I'm using Arduino UNO.
I Have the keyboard data decoded and printing to the serial port (computer) fine.
I want to send this data to a 16X2 LCD as soon as it is entered on the keypad.
The LCD is working fine with serial input from computer to the Arduino but I cannot get the data to display on the
LCD as soon as a key is depressed. I have to send “enter”, then all three numbers are displayed.
I must have all three numbers sent to the transmitter as a group but the LCD should display them instantly as they are entered.
When the three numbers have been entered , the "*" key will send the string of numbers to a NRF24L01.
Another NRF24L01 and Arduino UNO will decode the data and display the numbers on a large 3 digit, 7 segment display.
The 7 segment display/decoder is working fine.
I can't seem to get the keyboard data into a form suitable for sending to either the 16X2 LCD or the NRF24L01.
I can't even seem to get it into a string. I guess this is the form I need?
I think the NRF24L01 will need a string of 3 digit numbers as a string? Right?
This is the code I have so far. Any help in getting me headed in the right direction would be greatly appreciated.
I gone over and over all the examples and tutorials on strings I can find but I can't seem to absorb it enough to make it work.
// key board to remote display.
#include <Keypad.h>
#include <LiquidCrystal.h>
int i;
String A; // Setup string to contain the data to transmit.
String B;
String C;
String D;
// set up the keypad decode
const byte ROWS = 4; // Four rows
const byte COLS = 3; // Three columns
// Define the Keymap
char keys[ROWS][COLS] = {
{'1','2','3'},
{'4','5','6'},
{'7','8','9'},
{'*','0','#'}
};
byte rowPins[ROWS] = { 5, 4, 3, 2 }; // keypad rows to Arduino pins
byte colPins[COLS] = { 6, 7, 8 }; //keypad columns to Arduino pins
// Create the Keypad
Keypad kpd = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );
#define NRF2401 // output pin to xmitter
void setup()
{
Serial.begin(9600);
}
void loop()
{
char key = kpd.getKey();
delay(10);
if(key) // Check for a valid key.
{
switch (key) // check for transmit or clear keys
{
case '*': //send data to transmitter
Serial.print(key); // send data to xmitter
Serial.println(" pressed"); //testing
break;
// digitalWrite(transmit); // for testing
// break; // for testing
case '#': // clear and reset data
A,B,C=""; // clear strings
Serial.print(key);
Serial.println(" Cleared"); // testing
// Serial.println(C4); // for testing
break;
default: //accum max 3 char
for(int i=0 ; i<4 ; i++){
if (i==1)
A = A + char(key);
Serial.print (A); // for testing
Serial.print (key); // for testing
if(i==2)
B = A +(key); // for testing
Serial.print(B); // for testing
if(i==3)
C = B +(key);
Serial.println(C); // for testing
Serial.print(i); // for testing
Serial.print (A); // for testing
break;
// Serial.println(C); // for testing
}
}
/* Serial.print (A);
Serial.print(char(B)); // For testing
Serial.print(char(C));
Serial.print (char(A+B+C+D));
*/
if(i==4) //Too many digits! Only three allowed
Serial.print(" ERROR");
// Serial.println(i) ;
}
}
