Walkie Tappie (Wireless Morse Code)

#include"pitches.h"
#include <RH_RF95.h>
#define RFM95_CS 8
#define RFM95_RST 4
#define RFM95_INT 7
#define RF95_FREQ 915.0
RH_RF95 rf95(RFM95_CS, RFM95_INT);


const int  buttonPin = 11;    // the pin that the pushbutton is attached to
const int tonepin = 12; //the pin that the speaker is attached to

int buttonState = 0;     // current state of the button
int lastButtonState = 0; // previous state of the button
int startPressed = 0;    // the moment the button was pressed
int endPressed = 0;      // the moment the button was released
int holdTime = 0;        // how long the button was hold
int idleTime = 0;        // how long the button was idle
int idleArray[100];     // array to record button idle times
int holdArray[100];   // array to record button hold times
int i; 
int j;
int k;
int sendArray[200];   // array to store idle/hold times to be sent
uint8_t buf[251];   //Lora message buffer
int recvArray[124];   
int pressed = 0;


void setup() {
  pinMode(RFM95_RST, OUTPUT);
  digitalWrite(RFM95_RST, HIGH);

 //Serial.begin(9600);
  
 // while (!Serial) {
 //   delay(1);
 // }

  delay(100);
  digitalWrite(RFM95_RST, LOW);
  delay(10);
  digitalWrite(RFM95_RST, HIGH);
  delay(10);
  while (!rf95.init()) {
    //Serial.println("LoRa radio init failed");
    SoS(); // beeps SoS if radio fails to start
    while (1);
  }
  if (!rf95.setFrequency(RF95_FREQ)) {
    //Serial.println("setFrequency failed");
    SoS();
    while (1);
  }
  //Serial.print("Set Freq to: "); Serial.println(RF95_FREQ);
  
  pinMode(buttonPin, INPUT); // initialize the button pin as a input
  rf95.setTxPower(23, false);

}

void loop() {
  buttonState = digitalRead(buttonPin); // read the button input
  updateState();
  /******************************Transmit******************************/
  if(idleTime > 5000 && pressed == 1){ //Only transmit if it's been 5 seconds since last button press
  pressed = 0; //reset button press
  k = 0;
  idleArray[0] = 0; //set first delay to zero so the message doesn't start with delay
  for(i=0;i<124;){
      sendArray[i]=idleArray[k]; //Put idle times in even index of sendArray
      i = i + 1; //indexing sendArray
      sendArray[i]=holdArray[k]; //Put hold times in odd index of sendArray
      i = i + 1;
      k = k + 1; //indexing idle and hold arrays     
  }
    memcpy(buf,sendArray,sizeof(sendArray)); //copy send array into uint8_t buffer
    //for(i=0;i<200;i++){ //For debug
    //  Serial.println((int)x[i]);
    //}
    rf95.send(buf, sizeof(buf)); // Send buffer
    rf95.waitPacketSent(); 
    startPressed = millis(); //reset counter
    memset(idleArray,0,sizeof(idleArray)); //clear arrays
    memset(holdArray,0,sizeof(holdArray));
    i = 0; 
    j = 0;
    tone(tonepin,NOTE_C6); //play tone to indicate message sent
    delay(100);
    noTone(tonepin);
  }
  delay(2);
  if(lastButtonState != buttonState && buttonState == 1){
    idleArray[i] = idleTime; //Record button idletime into array
    //Serial.print(idleArray[i]);
    //Serial.print(" ");
    i++;
  }
 
  if(lastButtonState != buttonState && buttonState == 0){
    holdArray[j] = holdTime;
    //Serial.println(holdArray[j]);
    j++;
  }
  lastButtonState = buttonState;
  /******************************Recieve******************************/
   if (rf95.available())
  {
    uint8_t len = sizeof(buf);
    if (rf95.recv(buf, &len))
    {
      /*
      RH_RF95::printBuffer("Received: ",buf, len);
      Serial.println(*(int*)buf);
      Serial.print("RSSI: ");
      Serial.println(rf95.lastRssi(), DEC);
      */
      memcpy(recvArray,buf,sizeof(buf)); //copy recieved buffer into our reciving array
      /*
      for(i = 0; i < 100; i++){
        Serial.println(x[i]);
        Serial.print(idleIn[i]);
        Serial.print(" ");
        Serial.println(holdIn[i]);
      }*/
     for(i = 0; i < 124; i++){ //play the message
        noTone(tonepin);
        delay(recvArray[i]);
        tone(tonepin,NOTE_C5);
        i = i + 1;
        delay(recvArray[i]);
        noTone(tonepin);
      }
      i = 0;
    }
  }
  
}

void updateState() {
  if (buttonState == HIGH) {
      startPressed = millis();
      holdTime = startPressed - endPressed; //time button was held down
      tone(tonepin,NOTE_C5);
      if(idleTime > 5000){
        idleTime = 0; //if button was pressed after more than 5 seconds idle, restart 5 second timer
      }
      pressed = 1; //button was pressed
  } 
  if(buttonState == LOW){
    noTone(tonepin);
      endPressed = millis();
      idleTime = endPressed - startPressed; //time button was idle
    }
}

void SoS() { //SoS message
tone(tonepin,NOTE_C5);
delay(300);
noTone(tonepin);
delay(100);
tone(tonepin,NOTE_C5);
delay(300);
noTone(tonepin);
delay(100);
tone(tonepin,NOTE_C5);
delay(300);
noTone(tonepin);
delay(300);

tone(tonepin,NOTE_C5);
delay(100);
noTone(tonepin);
delay(100);
tone(tonepin,NOTE_C5);
delay(100);
noTone(tonepin);
delay(100);
tone(tonepin,NOTE_C5);
delay(100);
noTone(tonepin);
delay(300);

tone(tonepin,NOTE_C5);
delay(300);
noTone(tonepin);
delay(100);
tone(tonepin,NOTE_C5);
delay(300);
noTone(tonepin);
delay(100);
tone(tonepin,NOTE_C5);
delay(300);
noTone(tonepin);
}