Arduino uint16_t and sensor keyboard issue

Projects Programming
1

I have a working code with 4*4 matrix keyboard, it's tested and working. I've just got a keyboard like this one

And I'm trying to make it work with the same code, I'm able to print the inputs but cannot store and compare them.I guess the problem is here uint16_t customKey = ttp229.ReadKeys16(); if I remove uint16_t , then I cannot read keys anymore

#include <TTP229.h>
#define Password_Lenght 4 


char Data[Password_Lenght]; 
char Master[Password_Lenght] = "111"; 
byte data_count = 0, master_count = 0;
bool Pass_is_good;
char customKey;
const int SCL_PIN = 2; // The pin number of the clock pin.
const int SDO_PIN = 3; // The pin number of the data pin.

TTP229 ttp229(SCL_PIN, SDO_PIN); // TTP229(sclPin, sdoPin)


void setup()
{
pinMode(13, OUTPUT);
   
Serial.begin(9600);  
Serial.println("Hello");
}


void loop()
{
 
uint16_t customKey = ttp229.ReadKeys16(); // I think the issue is here uint16_t

  if (customKey) // makes sure a key is actually pressed, equal to (customKey != NO_KEY)
  {
    Serial.println(customKey);
    beep (50);
    Data[data_count] = customKey; // store char into data array, after this data looks empty!
    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
  {
  
    if(!strcmp(Data, Master)){ // equal to (strcmp(Data, Master) == 0)
   
      Serial.println("Good");
      beep (500);   
      beep (500);


 }
    else {
      Serial.println("Bad");
      beep (50);
      beep (50);
    }
    clearData();   
  }
}

void clearData()
{
  while(data_count !=0)
  {   // This can be used for any array size, 
    Data[data_count--] = 0; //clear array for new data
  }
  return;
}

void beep(unsigned char delayms){
  analogWrite(13, 200);      // Almost any value can be used except 0 and 255
                          // experiment to get the best tone
  delay(delayms);          // wait for a delayms ms
  analogWrite(13, 0);       // 0 turns it off
  delay(delayms);          // wait for a delayms ms   
}
2 
#define Password_Lenght 4 // Give enough room for six chars + NULL char

Yeah, right.

3

Part of copied code, it Was for 6 numbers, anyway the question is different

4

And how much else of the code have you changed?
Where did you get the library?

5

Library downloaded from here:
https://codeload.github.com/arduino12/ttp229-arduino/zip/master

Library is working fine, I can output the read buttons, the problems comes when I want to save and compare them

6

What does your sole debug print say?

// store char into data array, after this data looks empty!

What does this comment mean?

Your string handling looks a bit ragged and could be simplified/

7

store char into data array, after this data looks empty!

I mean, here I add a char to array, but when I print the array it's empty.

if (customKey) 
  {
    Serial.println(customKey); // Printing the pressed key, working
    beep (50);
    Data[data_count] = customKey; // store char into data array

//If I do here  Serial.println(Data[data_count]) it just print an empty line

    data_count++; // increment data array by 1 to store new char, also keep track of the number of chars entered
   
  }
8

I mean, here I add a char to array, but when I print the array it's empty.

If you just put something in it, how can it be empty?
Where do you print it?

9

I tried in different places,but here it should work, but it's not

if (customKey) // makes sure a key is actually pressed, equal to (customKey != NO_KEY)
  {
    Serial.println(customKey);
    beep (50);
    Data[data_count] = customKey; 

 Serial.println( Data[data_count] ); // I do print it Here!
    data_count++; 
   
  }
10

What is the value of "customKey" here:   Serial.println(customKey);?

11

It's the pressed key, prints keys from 1 till 16 pushed.