Vehicle Data rev_25

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    - Project: Vehicle Data
    - Source Code NOT compiled for: Arduino Mega
    - Source Code created on: 2025-07-12 21:10:55

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
    /* send data from bluetooth to android app */
/****** END SYSTEM REQUIREMENTS *****/

/* START CODE */

/****** DEFINITION OF LIBRARIES *****/
#include <SoftwareSerial.h>

/****** FUNCTION PROTOTYPES *****/
void setup(void);
void loop(void);
float T_interpolate(byte DS_Temp); // Prototype for T_interpolate function

/***** DEFINITION OF Software Serial *****/
const uint8_t HC05_BluetoothModule_HC05_mySerial_PIN_SERIAL_TX_A0 = A0;
const uint8_t HC05_BluetoothModule_HC05_mySerial_PIN_SERIAL_RX_A1 = A1;
SoftwareSerial HC05_BluetoothModule_HC05_mySerial(HC05_BluetoothModule_HC05_mySerial_PIN_SERIAL_RX_A1, HC05_BluetoothModule_HC05_BluetoothModule_HC05_mySerial_PIN_SERIAL_TX_A0);

// Define pins for ALDL activity and data output controls
const int ALDLTestPin = 2; // Example pin, set accordingly
const int DecodeDataOutputPin = 3; // Example pin, set accordingly
const int HexDataOutputPin = 4; // Example pin, set accordingly

// Define Mode 1 command array (example, replace with actual command)
const byte M1Cmd[4] = {0x80, 0x95, 0x01, 0x00}; // Placeholder command

// Preamble bytes (example, replace with actual preamble)
const byte Preamble[3] = {0x80, 0x95, 0x01};

void setup(void)
{
  // Initialize serial ports
  Serial.begin(115200); // For debugging and output
  Serial1.begin(8192);  // ALDL data at 8192 baud

  // Initialize pins
  pinMode(ALDLTestPin, INPUT); // Listen for ALDL activity
  pinMode(DecodeDataOutputPin, INPUT_PULLUP); // Decoded data output control
  pinMode(HexDataOutputPin, INPUT_PULLUP); // Hex data output control

  // Initialize Bluetooth serial
  HC05_BluetoothModule_HC05_mySerial.begin(9600);
  delay(1500);
  Serial.println("Ready for data capture");
}

void loop() {
  // Wait for silence period on the ALDL
  Serial.print("wait for silence ");
  bool SilenceFound = false; // Reset silence flag
  unsigned long StartTime = micros(); // Start timer
  while ((micros() - StartTime) < 15000) // Wait for 15 ms silence
  {
    if (digitalRead(ALDLTestPin) == 0)
    {
      StartTime = micros(); // Reset timer if activity detected
    }
  }
  SilenceFound = true; // Silence detected

  while (SilenceFound == true)
  {
    bool PreambleFound = false; // Reset preamble flag
    // Send Mode 1 command repeatedly
    while (PreambleFound == false)
    {
      Serial.print(" M1 cmd ");
      int i = 0;
      while (i < 4)
      {
        Serial1.write(M1Cmd[i]);
        i++;
      }
      Serial.println(" Finding Preamble  ");
      i = 0;
      unsigned long PreambleTimer = millis();
      while ((millis() - PreambleTimer) < 100 && PreambleFound == false)
      {
        if (Serial1.available() > 0)
        {
          int ALDLbyte = Serial1.read();
          if (ALDLbyte == Preamble[i])
          {
            i++;
            if (i > 2) PreambleFound = true;
          }
          else
          {
            PreambleFound = false;
            i = 0;
          }
        }
      }
    }
    // Read data stream after preamble
    int DataStreamIndex = 1;
    byte DataBytes[65]; // 64 bytes + checksum
    while (DataStreamIndex < 65)
    {
      if (Serial1.available() > 0)
      {
        DataBytes[DataStreamIndex] = Serial1.read();
        DataStreamIndex++;
      }
    }
    // Calculate checksum
    int i = 1;
    unsigned int CheckTotal = 0x80 + 0x95 + 0x01; // Sum preamble bytes
    while (i < 64)
    {
      CheckTotal += DataBytes[i];
      i++;
    }
    byte CheckSum = 0x200 - CheckTotal; // Two's complement
    // Verify checksum
    if (digitalRead(DecodeDataOutputPin) == LOW)
    {
      Serial.print("New Data Stream received at ");
      Serial.print(millis());
      Serial.print(" Calc CHECKSUM: ");
      Serial.print(CheckSum, HEX);
      Serial.print(" Transmitted CHECKSUM: ");
      Serial.print(DataBytes[64], HEX);
      if (CheckSum == DataBytes[64])
      {
        Serial.println(" Checksum GOOD - Decoded Data as follows:   (Page 1) ");
      }
      else
      {
        Serial.println(" Checksum *** ERROR *** -  Decoded Data as follows:   (Page 1) ");
      }
      // Extract data
      float RPM = DataBytes[11] * 25;
      float TPS = DataBytes[10] * 0.019608;
      float MAF = ((DataBytes[36] * 256) + DataBytes[37]) * 0.003906;
      int BLCELL = DataBytes[21];
      int BLM = DataBytes[20];
      int INTEGRATOR = DataBytes[22];
      float InjPW = ((DataBytes[45] * 256) + DataBytes[46]) * 0.015259;
      float O2mv = DataBytes[17] * 4.44;
      float MAT = T_interpolate(DataBytes[30]);
      unsigned int Runtime = (DataBytes[52] * 256) + DataBytes[53];

      // Prepare data string to send over Bluetooth
      String dataString = "";
      dataString += "Engine Speed: " + String(RPM) + " RPM\n";
      dataString += "Throttle Position: " + String(TPS) + " V\n";
      dataString += "Mass Air Flow: " + String(MAF) + " g/sec\n";
      dataString += "Current BLM Cell: " + String(BLCELL) + " BLM Value: " + String(BLM) + "\n";
      dataString += "Fuel Injector Pulse: " + String(InjPW) + " ms\n";
      dataString += "O2 Sensor Voltage: " + String(O2mv) + " mV\n";
      dataString += "Intake Air Temp: " + String(MAT) + " °C\n";
      dataString += "Engine Runtime: " + String(Runtime) + " sec\n";

      // Send data over Bluetooth
      HC05_BluetoothModule_HC05_mySerial.println(dataString);

      // Print data to Serial for debugging
      Serial.print("Engine Speed     : ");
      Serial.print(RPM);
      Serial.println(" RPM");
      Serial.print("Throttle Position: ");
      Serial.print(TPS);
      Serial.println(" Volts");
      Serial.print("Mass Air Flow    : ");
      Serial.print(MAF);
      Serial.println(" Grams/Sec");
      Serial.print("Current BLM Cell: ");
      Serial.print(BLCELL);
      Serial.print(" BLM Value: ");
      Serial.print(BLM);
      Serial.print("  Current Fuel Integrator: ");
      Serial.println(INTEGRATOR);
      Serial.print("Injector Pulse   : ");
      Serial.print(InjPW);
      Serial.println(" Milliseconds");
      Serial.print("O2 Sensor Voltage: ");
      Serial.print(O2mv);
      Serial.println(" Millivolts");
      Serial.print("Intake Air Temp  : ");
      Serial.print(MAT);
      Serial.println(" Deg C");
      Serial.print("Engine Run Time  : ");
      Serial.print(Runtime);
      Serial.println(" Seconds");
      // Delay for readability
      unsigned long StartTimeDelay = millis();
      while (millis() < StartTimeDelay + 3000)
      {
        if (Serial1.available() > 0) ALDLbyte = Serial1.read(); // Flush buffer
      }
    }
    else if (digitalRead(HexDataOutputPin) == LOW)
    {
      Serial.print("New Data Stream received at ");
      Serial.print(millis());
      Serial.print(" Calc CHECKSUM: ");
      Serial.print(CheckSum, HEX);
      Serial.print(" Transmitted CHECKSUM: ");
      Serial.print(DataBytes[64], HEX);
      if (CheckSum == DataBytes[64])
      {
        Serial.println(" Checksum GOOD - Data as follows: ");
      }
      else
      {
        Serial.println("Checksum *** ERROR *** -  Data as follows: ");
      }
      // Hex dump
      int j = 1;
      int bytecounter = 0;
      while (j <= 64)
      {
        Serial.print(DataBytes[j], HEX);
        Serial.print(" ");
        j++;
        bytecounter++;
        if (bytecounter >= 32)
        {
          bytecounter = 0;
          Serial.println();
        }
      }
      Serial.println();
    }
    else
    {
      // Raw binary stream
      Serial.write(0x80);
      Serial.write(0x95);
      Serial.write(0x01);
      for (int j = 1; j <= 64; j++)
      {
        Serial.write(DataBytes[j]);
      }
    }
  }
}

// Implementation of T_interpolate function
float T_interpolate(byte DS_Temp)
{
  const float TempScale[38] = {1,5,6,9,11,15,19,25,31,38,47,57,67,79,91,104,117,130,142,154,164,175,184,192,200,206,212,217,222,226,230,233,235,238,240,242,244,256};
  const float TempValue[38] = {-40,-30,-25,-20,-15,-10,-5,0,5,10,15,20,25,30,35,40,45,50,55,60,65,70,75,80,85,90,95,100,105,110,115,120,125,130,135,140,145,200};
  float T_Range, T_Diff, TempRange, Temperature;
  int i = 0;
  while (i < 38)
  {
    if (TempScale[i] > DS_Temp) break;
    i++;
  }
  if (i > 0)
  {
    T_Range = TempScale[i] - TempScale[i - 1];
    T_Diff = DS_Temp - TempScale[i - 1];
    TempRange = TempValue[i] - TempValue[i - 1];
    Temperature = TempValue[i - 1] + (T_Diff / T_Range) * TempRange;
  }
  else
  {
    Temperature = TempValue[0];
  }
  return Temperature;
}