Read bit and convert to char for IR

Projects Programming
1

Hello, i'm working on an IR Project using keypad as an input and serial monitor as an output. I also using Pulse distance Coding and NEC remote protocol.

This is my tx code:

#include <Keypad.h>
String kodebithuruf[]=
  {"01100001","01100010","01100011","01100100","01100101",
  "01100110","01100111","01101000","01101001","01101010",
  "01101011","01101100","01101101","01101110","01101111",
  "01110000","01110001","01110010","01110011","01110100",
  "01110101","01110110","01110111","01111000","01111001",
  "01111010","00100000",
  "00110000","00110001","00110010","00110011","00110100",
  "00110101","00110110","00110111","00111000","00111001",
  "00101110","00101100","00111010"};

char data[50];
int k=0;
const byte ROWS = 4; //four rows
const byte COLS = 4; //three columns
char keys[ROWS][COLS] = {
  {'1','2','3','^'},
  {'4','5','6','/'},
  {'7','8','9','

And this is my Rx code:

volatile int durasi;
volatile int prev_time;
volatile int data_simpan[255];
int x=0;
byte tambah;

void setup() {
Serial.begin(250000);
Serial.println(F("Ready to receive IR signals"));
attachInterrupt(1, jatuh, RISING);
}

void loop() {
}

void jatuh() {
detachInterrupt(1);
prev_time=micros();
attachInterrupt(1,naik,FALLING);
}

void naik(){
detachInterrupt(1);
durasi=micros()-prev_time;
data_simpan[x]=durasi;
baca(data_simpan[x]);
x++;
attachInterrupt(1, jatuh, RISING);
}

byte lock=0;
int ya=0;
void baca(int sementara){
if (ya!=9){
if ((sementara < 5000)&&(sementara > 4000)){
 ya=1;
 tambah==1;
 lock==0;
 //"header"
} else if ((sementara < 2000)&&(sementara > 1500)){
 lock==tambah+lock;
 tambah=tambah*2;
 ya++;
 //"1";
  } else if ((sementara < 800)&&(sementara > 300)){
    tambah=tambah*2;
    ya++;
    //"0";
    }
	
}else if (ya==9){
 Serial.write(lock);
 tambah=1;
 lock==0;
 ya=1;
 }else{
  Serial.println("Error bit");
  }
}

I succeed when i read binary data and if i only send 1 character and reset it before send any other data, but if i send more than 1, strange character always showed up.

This is my first post, so sorry if i mistaken anything. I really want to graduate this year, so i really appreciate any kind of help, thanks!},
  {'<','0','>','@'}
};

byte rowPins[ROWS] = {7, 6, 5, 4};
byte colPins[COLS] = {11, 10, 9, 8};

Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );

void setup(){
  Serial.begin(1200);
}

void loop(){
  char key = keypad.getKey(); 
  if (key){
    Serial.println(key);
    if (key!='


And this is my Rx code:

§DISCOURSE_HOISTED_CODE_1§


I succeed when i read binary data and if i only send 1 character and reset it before send any other data, but if i send more than 1, strange character always showed up. 

This is my first post, so sorry if i mistaken anything. I really want to graduate this year, so i really appreciate any kind of help, thanks!){
    data[k]=key;
    k++;
    }else if(key='

And this is my Rx code:

§_DISCOURSE_HOISTED_CODE_1_§

I succeed when i read binary data and if i only send 1 character and reset it before send any other data, but if i send more than 1, strange character always showed up.

This is my first post, so sorry if i mistaken anything. I really want to graduate this year, so i really appreciate any kind of help, thanks!){
    k++;
    data[k]='!';
    header();
    hasil();
    }
  }
}

void header() {
  tone(3,38000);
  delayMicroseconds(4250);
  noTone(3);
  header_mark();
}

void header_mark() {
  noTone(3);
  digitalWrite(3,HIGH);
  delayMicroseconds(4500);
  Serial.println("header");
}

void logika0(){
  tone(3,38000);
  delayMicroseconds(260);
  noTone(3);
  digitalWrite(3,HIGH);
  delayMicroseconds(520);
  Serial.print('0');
  return;
}

void logika1(){
  tone(3,38000);
  delayMicroseconds(260);
  noTone(3);
  digitalWrite(3,HIGH);
  delayMicroseconds(1670);
  Serial.print('1');
  return;   
}

void kirimhuruf(int posisi){
  String simbol = kodebithuruf[posisi];

for (int i=simbol.length();i>-1;i--;){

if (simbol[i]=='1'){
      logika1();
    }else{
      logika0();
    }
    }
}

void hasil() { 
int karakter;
int p=0,s=0;
while (data[p]!='!'){
  p++;
}
for (int k=0;k<p;k++){
karakter = data[k];
  Serial.print(data[k]);
  if ((karakter>='a')&&(karakter<='z'))
    kirimhuruf(karakter-'a');
    else
    if ((karakter>='A')&&(karakter<='Z'))
    kirimhuruf(karakter-'A');
      else
      if (karakter==' ')
      kirimhuruf(26);
        else
        if ((karakter>='0')&&(karakter<='9'))
        kirimhuruf(karakter-'0'+27);
          else
          if (karakter=='.')
          kirimhuruf(37);
            else
            if (karakter==',')
            kirimhuruf(38);
              else
              if (karakter==':')
              kirimhuruf(39);
  }
}


And this is my Rx code:

§DISCOURSE_HOISTED_CODE_1§


I succeed when i read binary data and if i only send 1 character and reset it before send any other data, but if i send more than 1, strange character always showed up. 

This is my first post, so sorry if i mistaken anything. I really want to graduate this year, so i really appreciate any kind of help, thanks!
2 
  for (int i = simbol.length(); i > -1;)
  {
    i--;

Why the unconventional use of a for loop ?

More generally, why are you using Strings, especially when you could use bytes, or even better the bits within bytes to represent your data ?

3

"why the unconventional data for a loop?"
Because i want to send data from the LSB to MSB so i can read the data as byte in the receiver.

And i use string instead of byte in tx because i haven't succeed in using byte for rx

4

Why not put the variable decrement in the for loop initialisation ?

Serial sends bytes whatever data type you use

5

Yeah, i edited it, thanks.
Actually i've checked my coding using serial monitor and oscilloscope in the tx and rx are fine. But when i change the byte into char in the rx it error. Do you know why?

6

Do you know why?

Not without seeing your code and error messages.

7

The code is as looked above. But i add serial print to show the bit.

byte lock=0;
int ya=0;
void baca(int sementara){
if (ya!=9){
if ((sementara < 5000)&&(sementara > 4000)){
 ya=1;
 tambah==1;
 lock==0;
 Serial.println("header");
} else if ((sementara < 2000)&&(sementara > 1500)){
 lock==tambah+lock;
 tambah=tambah*2;
 ya++;
 Serial.print("1");
  } else if ((sementara < 800)&&(sementara > 300)){
    tambah=tambah*2;
    ya++;
    Serial.print("0");
    }else{
      Serial.print("x");
      }

}else if (ya==9){
 Serial.write(lock);
 tambah=1;
 lock==0;
 ya=1;
 }else{
  Serial.println("Error bit");
  }
}

But, the serial write didn't write the character as showed in the picture below.

decode.JPG

8

I've changed my code when using byte, i use = instead of ==. If i send more than 1 character, the last character can't be converted from byte to char. This is what i change:

byte lock=0;
int ya=0;
void baca(int sementara){
if (ya!=9){
if ((sementara < 5000)&&(sementara > 4000)){
 ya=1;
 tambah=1;
 lock=0;
 Serial.println("header");
} else if ((sementara < 2000)&&(sementara > 1500)){
 lock=tambah+lock;
 tambah=tambah*2;
 ya++;
 Serial.print("1");
  } else if ((sementara < 800)&&(sementara > 300)){
    tambah=tambah*2;
    ya++;
    Serial.print("0");
    }else{
      //Serial.print("x");
      }

}else if (ya==9){
 Serial.write(lock);
 tambah=1;
 lock=0;
 ya=1;
 }else{
  Serial.println("Error bit");
  }
}

This is when i send 7:

Ready to receive IR signals
header
11101100

It didn't show the character, but when i send 2 character, the first character is showed.

This is when i reset the tx and send 75:

Ready to receive IR signals
header
1110110071101100

And this is when i reset tx and send 759:

Ready to receive IR signals
header
111011007101011005011100

The last char only showed if i resend the data or add another data:

Ready to receive IR signals
header
11101100 7 10101100 5 00011100 //this is when i press 758
11101100 7 10101100 5 00011100 8 header //this is when i resend it                                 
11101100 7 10101100 5 00011100 8 10011100 //this is when i press 9 then send without reset
11101100 7 10101100 5 00011100 8 10011100 9 header // this is when i press resend

And so on..
Also, i want if i already send the data, i don't need to reset the arduino before send the new data.