Vehicle Data rev_15

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    - Project: Vehicle Data
    - Source Code NOT compiled for: Arduino Mega
    - Source Code created on: 2025-07-11 21:59:29

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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);
void sendDataToAndroid(float RPM, float TPS, float MAF, int BLCELL, int BLM, int INTEGRATOR, float InjPW, float O2mv, float MAT, unsigned int Runtime);

/***** 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_mySerial_PIN_SERIAL_TX_A0);

// Define pins and variables used in the code
const int ALDLTestPin = 2; // Example pin, set accordingly
const int DecodeDataOutputPin = 3; // Example pin, set accordingly
const int HexDataOutputPin = 4; // Example pin, set accordingly
const byte M1Cmd[4] = {0x01, 0x02, 0x03, 0x04}; // Example command, set accordingly
const int ByteCount = 64; // Example byte count, set accordingly
const int linecount = 16; // Example line count for hex output
int DataBytes[65]; // Buffer for data bytes
bool SilenceFound = false;
bool PreambleFound = false;
unsigned long PreambleTimer = 0;
unsigned long PreambleTimerStart = 0;
int ALDLbyte = 0;
int bytecounter = 0;

// Placeholder variables for undefined identifiers
int linecount = 16; // For hex output line length

void setup(void)
{
  // put your setup code here, to run once:
  HC05_BluetoothModule_HC05_mySerial.begin(9600);
  Serial.begin(115200); // Initialize Serial for debugging/output
  pinMode(ALDLTestPin, INPUT); // ALDL activity listen pin
  pinMode(DecodeDataOutputPin, INPUT_PULLUP); // Decoded data output control
  pinMode(HexDataOutputPin, INPUT_PULLUP); // Hex data output control
  delay(1500);
  Serial.println("Ready for data capture");
}

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

  while (SilenceFound == true) { // While silence detected, request and process data
    PreambleFound = false; // Reset preamble flag

    // Send Mode 1 command to request data
    while (PreambleFound == false) {
      Serial.print(" M1 cmd ");
      for (int i = 0; i < 4; i++) {
        Serial1.write(M1Cmd[i]);
      }
      Serial.println(" Finding Preamble  ");
      int i = 0;
      PreambleTimer = millis();
      while ((millis() - PreambleTimer) < 100 && PreambleFound == false) {
        if (Serial1.available() > 0) {
          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;
    while (DataStreamIndex < 65) {
      if (Serial1.available() > 0) {
        DataBytes[DataStreamIndex] = Serial1.read();
        DataStreamIndex++;
      }
    }

    // Calculate checksum
    int i = 1;
    unsigned long CheckTotal = 0x80 + 0x95 + 0x01; // Sum preamble bytes
    while (i < ByteCount) {
      CheckTotal += DataBytes[i];
      i++;
    }
    byte CheckSum = 0x200 - CheckTotal; // Two's complement

    // Verify checksum and output data
    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) ");
      }

      // Extract and convert data
      float RPM = DataBytes[11] * 25; // Engine RPM
      float TPS = DataBytes[10] * 0.019608; // Throttle position in volts
      float MAF = ((DataBytes[36] * 256) + DataBytes[37]) * 0.003906; // Mass Air Flow
      int BLCELL = DataBytes[21]; // Block learn cell
      int BLM = DataBytes[20]; // Block learn value
      int INTEGRATOR = DataBytes[22]; // Fuel trim
      float InjPW = ((DataBytes[45] * 256) + DataBytes[46]) * 0.015259; // Injector pulse width
      float O2mv = DataBytes[17] * 4.44; // O2 sensor in mV
      float MAT = T_interpolate(DataBytes[30]); // Intake temp
      unsigned int Runtime = (DataBytes[52] * 256) + DataBytes[53]; // Runtime seconds

      // Send data over Bluetooth to Android
      sendDataToAndroid(RPM, TPS, MAF, BLCELL, BLM, INTEGRATOR, InjPW, O2mv, MAT, Runtime);

      // Print data locally 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) {
      // Output 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: ");
      }

      // Print hex data
      int j = 1;
      bytebytecounter = 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 {
      // Send raw data stream
      Serial.write(0x80);
      Serial.write(0x95);
      Serial.write(0x01);
      for (int j = 1; j < ByteCount + 1; 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;
}

// Function to send data over Bluetooth to Android
void sendDataToAndroid(float RPM, float TPS, float MAF, int BLCELL, int BLM, int INTEGRATOR, float InjPW, float O2mv, float MAT, unsigned int Runtime) {
  // Format data as a comma-separated string
  String dataString = String(RPM, 0) + "," +
                      String(TPS, 3) + "," +
                      String(MAF, 3) + "," +
                      String(BLCELL) + "," +
                      String(BLM) + "," +
                      String(INTEGRATOR) + "," +
                      String(InjPW, 3) + "," +
                      String(O2mv, 1) + "," +
                      String(MAT, 1) + "," +
                      String(Runtime);
  // Send over Bluetooth
  HC05_BluetoothModule_HC05_mySerial.println(dataString);
}