Vehicle Data rev_17

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    - Project: Vehicle Data
    - Source Code NOT compiled for: Arduino Mega
    - Source Code created on: 2025-07-11 22:16:56

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
    /* send data from bluetooth to android */
/****** 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 temperature interpolation function

/***** DEFINITION OF Software Serial *****/
// Bluetooth module HC05 connected to pins A0 (TX) and A1 (RX)
const uint8_t HC05_Bluetooth_Module_HC05_mySerial_PIN_SERIAL_TX_A0 = A0;
const uint8_t HC05_Bluetooth_Module_HC05_mySerial_PIN_SERIAL_RX_A1 = A1;
SoftwareSerial HC05_Bluetooth_Module_HC05_mySerial(HC05_Bluetooth_Module_HC05_mySerial_PIN_SERIAL_RX_A1, HC05_Bluetooth_Module_HC05_Bluetooth_Module_HC05_mySerial_PIN_SERIAL_TX_A0);

void setup(void)
{
  // Initialize Bluetooth serial communication at 9600 baud
  HC05_Bluetooth_Module_HC05_mySerial.begin(9600);
}

void loop(void)
{
  // Variable declarations for data handling
  const byte ALDLTestPin = 4; // Input pin for ALDL activity detection
  const byte DecodeDataOutputPin = 5; // Pin to output decoded data
  const byte HexDataOutputPin = 6; // Pin to output hex data
  int ALDLbyte = 0; // Byte of ALDL data
  int bytecounter = 0; // Byte counter for formatting output
  const int linecount = 64; // Bytes per line for hex output
  byte M1Cmd[4] = {0x80, 0x56, 0x01, 0x29}; // Mode 1 command
  byte Preamble[3] = {0x80, 0x95, 0x01}; // Preamble indicating start of data stream
  bool PreambleFound = false;
  bool SilenceFound = false;
  bool CommInit8192 = false;
  const double SilenceWait = 15000; // Silence wait in microseconds
  unsigned long PreambleTimer;
  const int ByteCount = 64; // Total bytes in data packet including checksum
  byte DataBytes[ByteCount + 1]; // Data buffer (indexing from 1 for convenience)
  int DataStreamIndex = 1;
  int i = 0;
  unsigned long StartTime;
  unsigned int CheckTotal;
  byte CheckSum;

  // Variables for decoded data
  float RPM, TPS, MAF, InjPW, O2mv, MAT;
  int BLCELL, BLM, INTEGRATOR;
  unsigned int Runtime;

  // Wait for silence on ALDL line
  Serial.print("wait for silence ");
  SilenceFound = false;
  StartTime = micros();
  while ((micros() - StartTime) < 15000)
  {
    if (digitalRead(ALDLTestPin) == 0)
    {
      StartTime = micros();
    }
  }
  SilenceFound = true;

  // Main loop: continuously request and process data
  while (SilenceFound)
  {
    PreambleFound = false;

    // Send Mode 1 command and look for preamble
    while (!PreambleFound)
    {
      Serial.print(" M1 cmd ");
      for (i = 0; i < 4; i++)
      {
        Serial1.write(M1Cmd[i]);
      }
      Serial.println(" Finding Preamble  ");
      i = 0;
      PreambleTimer = millis();
      while ((millis() - PreambleTimer) < 100 && !PreambleFound)
      {
        if (Serial1.available() > 0)
        {
          ALDLbyte = Serial1.read();
          if (ALDLbyte == Preamble[i])
          {
            i++;
            if (i > 2)
              PreambleFound = true;
          }
          else
          {
            PreambleFound = false;
            i = 0;
          }
        }
      }
    }

    // Read complete data packet
    DataStreamIndex = 1;
    while (DataStreamIndex <= ByteCount)
    {
      if (Serial1.available() > 0)
      {
        DataBytes[DataStreamIndex] = Serial1.read();
        DataStreamIndex++;
      }
    }

    // Calculate checksum
    i = 1;
    CheckTotal = 0x80 + 0x95 + 0x01;
    while (i < ByteCount)
    {
      CheckTotal += DataBytes[i];
      i++;
    }
    CheckSum = 0x200 - CheckTotal;

    // Send data to Android via Serial
    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[ByteCount], HEX);
      if (CheckSum == DataBytes[ByteCount])
        Serial.println(" Checksum GOOD - Decoded Data as follows:   (Page 1) ");
      else
        Serial.println(" Checksum *** ERROR *** -  Decoded Data as follows:   (Page 1) ");

      // Parse data
      RPM = DataBytes[11] * 25;
      TPS = DataBytes[10] * 0.019608;
      MAF = ((DataBytes[36] * 256) + DataBytes[37]) * 0.003906;
      BLCELL = DataBytes[21];
      BLM = DataBytes[20];
      INTEGRATOR = DataBytes[22];
      InjPW = ((DataBytes[45] * 256) + DataBytes[46]) * 0.015259;
      O2mv = DataBytes[17] * 4.44;
      MAT = T_interpolate(DataBytes[30]);
      Runtime = (DataBytes[52] * 256 + DataBytes[53]);

      // Output parsed data
      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 and buffer purge
      unsigned long StartTimeDelay = millis();
      while (millis() < StartTimeDelay + 3000)
      {
        if (Serial1.available() > 0)
          ALDLbyte = Serial1.read(); // Flush buffer
      }
    }
    else if (digitalRead(HexDataOutputPin) == LOW)
    {
      // Send hex data
      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[ByteCount], HEX);
      if (CheckSum == DataBytes[ByteCount])
        Serial.println(" Checksum GOOD - Data as follows: ");
      else
        Serial.println("Checksum *** ERROR *** -  Data as follows: ");

      int j = 1;
      bytecounter = 0;
      while (j <= ByteCount)
      {
        Serial.print(DataBytes[j], HEX);
        j++;
        bytecounter++;
        if (bytecounter >= linecount)
        {
          bytecounter = 0;
          Serial.println();
        }
        else
        {
          Serial.print(" ");
        }
      }
      Serial.println();
    }
    else
    {
      // Raw binary stream
      Serial.write(0x80);
      Serial.write(0x95);
      Serial.write(0x01);
      for (int j = 1; j <= ByteCount; j++)
      {
        Serial.write(DataBytes[j]);
      }
    }
  }
}

// Subroutine to interpolate MAT temperature
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;
}