Vehicle Data rev_19

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    - Project: Vehicle Data
    - Source Code NOT compiled for: Arduino Mega
    - Source Code created on: 2025-07-11 22:25:37

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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); // Added prototype for the interpolation function

/***** DEFINITION OF Software Serial *****/
const uint8_t HC05_Bluetooth_TX_PIN = A0; // Bluetooth TX pin
const uint8_t HC05_Bluetooth_RX_PIN = A1; // Bluetooth RX pin
SoftwareSerial HC05(HC05_Bluetooth_TX_PIN, HC05_Bluetooth_RX_PIN);

// Define other variables used in the code
// Assuming these are declared globally as in the original code
// For example:
int ALDLTestPin = 2; // Example pin, replace with actual
int DecodeDataOutputPin = 3; // Example pin, replace with actual
int HexDataOutputPin = 4; // Example pin, replace with actual
byte M1Cmd[4] = {0x01, 0x02, 0x03, 0x04}; // Example command, replace with actual
byte Preamble[3] = {0x55, 0xAA, 0xFF}; // Example preamble
byte ALDLbyte;
int i, DataStreamIndex, ByteCount = 64; // Example value
byte DataBytes[65];
unsigned long PreambleTimer, StartTime, PreambleFound, SilenceFound, CommInit8192;
float RPM, TPS, MAF, BLCELL, BLM, INTEGRATOR, InjPW, O2mv, MAT, Runtime;
int linecount = 16; // Example for hex output line count
int bytecounter;

// Interpolation 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;
  float T_Diff;
  float TempRange;
  float 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;
}

void setup(void)
{
  // put your setup code here, to run once:
  HC05.begin(9600);
  Serial.begin(115200); // Initialize Serial for debugging and output
  // Initialize pins
  pinMode(ALDLTestPin, INPUT); // ALDL activity detection pin
  pinMode(DecodeDataOutputPin, INPUT_PULLUP); // Decoded data output control
  pinMode(HexDataOutputPin, INPUT_PULLUP); // Hex data output control

  // Initialize variables
  i = 0; // Reset preamble index
  PreambleFound = false;
  SilenceFound = false;
  CommInit8192 = false;
  StartTime = 0;
  PreambleTimer = 0;
  bytecounter = 0;
}

void loop() {
  // Wait for silence period on the ALDL
  Serial.print("wait for silence ");
  SilenceFound = false; // Reset silence flag
  unsigned long StartTimeMicros = micros(); // First look for an active signal or a timeout - initialize timer
  // Should exit this loop on the start of a bit
  while ((micros() - StartTimeMicros) < 15000) // Wait for a 15 ms silent period
  {
    if (digitalRead(ALDLTestPin) == 0) // Any line activity resets the start time
    {
      StartTimeMicros = micros(); // Timing starts over
    }
  }
  SilenceFound = true; // Set the silence flag on exit

  while (SilenceFound == true) // While silence found flag is set, continuously request and transmit Mode 1 data
  {
    PreambleFound = false; // Reset preamble found flag

    while (PreambleFound == false) // First look at data until the preamble has been found will read data forever until a preamble is read
    {
      // Send Mode 1 command
      Serial.print(" M1 cmd ");
      i = 0; // use bytecounter to send the outgoing Mode1CMD sequence
      while (i < 4)
      {
        Serial1.write(M1Cmd[i]); // sends 1 byte of the command sequence
        i++;
      }
      Serial.println(" Finding Preamble  ");
      i = 0; // Then reset byte counter and scan incoming data for the preamble
      PreambleTimer = millis(); // Initialize timer to detect timeout
      while ((((millis() - PreambleTimer) < 100)) && (PreambleFound == false))
      {
        if (Serial1.available() > 0)
        {
          ALDLbyte = Serial1.read();
          if (ALDLbyte == Preamble[i])
          {
            i++; // Increment the preamble index
            if (i > 2) PreambleFound = true; // Preamble found
          }
          else
          {
            PreambleFound = false; // Reset preamble found flag
            i = 0; // Reset the preamble index
          }
        }
      }
    }
    // Read data stream
    DataStreamIndex = 1; // Start at index 1
    while (DataStreamIndex < 65) // Read 64 bytes (including checksum)
    {
      if (Serial1.available() > 0)
      {
        DataBytes[DataStreamIndex] = Serial1.read();
        DataStreamIndex++;
      }
    }
    // Calculate checksum
    i = 1;
    CheckTotal = 0x80 + 0x95 + 0x01; // Sum preamble bytes
    while (i < ByteCount)
    {
      CheckTotal += DataBytes[i];
      i++;
    }
    CheckSum = 0x200 - CheckTotal; // Two's complement

    // Send data over Bluetooth to Android
    // For simplicity, send parsed data as a comma-separated string
    // Parse data
    RPM = DataBytes[11] * 25; // Engine RPM
    TPS = DataBytes[10] * 0.019608; // TPS volts
    MAF = ((DataBytes[36] * 256) + (DataBytes[37])) * 0.003906; // MAF gm/sec
    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]);

    // Prepare string to send over Bluetooth
    String dataString = "";
    dataString += "RPM:" + String(RPM) + ",";
    dataString += "TPS:" + String(TPS) + ",";
    dataString += "MAF:" + String(MAF) + ",";
    dataString += "BLCELL:" + String(BLCELL) + ",";
    dataString += "BLM:" + String(BLM) + ",";
    dataString += "INTEGRATOR:" + String(INTEGRATOR) + ",";
    dataString += "InjPW:" + String(InjPW) + ",";
    dataString += "O2mv:" + String(O2mv) + ",";
    dataString += "MAT:" + String(MAT) + ",";
    dataString += "Runtime:" + String(Runtime);

    // Send over Bluetooth
    HC05.println(dataString);

    // Existing code for checksum verification and output
    if (digitalRead(DecodeDataOutputPin) == LOW)
    {
      // Decoded data output
      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 (already done above)
      // Print 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
      unsigned long StartTime = millis();
      while (millis() < StartTime + 3000)
      {
        if (Serial1.available() > 0) ALDLbyte = Serial1.read(); // Flush buffer
      }
    }
    else if (digitalRead(HexDataOutputPin) == LOW)
    {
      // Hex data output
      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 + 1)
      {
        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 + 1; j++)
      {
        Serial.write(DataBytes[j]);
      }
    }
  }
}