Vehicle Data rev_14

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    - Project: Vehicle Data
    - Source Code NOT compiled for: Arduino Mega
    - Source Code created on: 2025-07-11 21:55:59

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

/* START CODE */

/****** DEFINITION OF LIBRARIES *****/

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

// Declare all variables and constants used in the code
const byte ALDLTestPin = 4;                  // ALDL input pin
const byte DecodeDataOutputPin = 2;          // Output pin for decoded data
const byte HexDataOutputPin = 3;             // Output pin for hex data
const byte Preamble[3] = {0x80, 0x95, 0x01}; // Preamble sequence
const int ByteCount = 64;                    // Total bytes expected in data stream
byte DataBytes[65];                          // Array to hold data bytes
byte ALDLbyte = 0;                           // Byte read from Serial1
unsigned long PreambleTimer = 0;             // Timer for preamble timeout
unsigned long StartTime = 0;                 // Timer for silence detection
bool SilenceFound = false;                   // Silence detection flag
bool PreambleFound = false;                  // Preamble detection flag
int DataStreamIndex = 1;                     // Data stream index
float CheckTotal = 0;                        // Checksum total
byte CheckSum = 0;                           // Calculated checksum
int i = 0;                                 // Loop variable
int linecount = 32;                        // lines per block for hex printing

// Variables related to data processing
unsigned int RPM;
float TPS;
float MAF;
byte BLCELL;
byte BLM;
byte INTEGRATOR;
float InjPW;
float O2mv;
float MAT;
unsigned long Runtime;

// Function prototypes for optional functions if needed
float T_interpolate(byte DS_Temp);  // Already declared

void setup() {
  // Setup pins
  pinMode(ALDLTestPin, INPUT);                          // define D4 as an input pin
  pinMode(DecodeDataOutputPin, INPUT_PULLUP);           // decoded data output pin
  pinMode(HexDataOutputPin, INPUT_PULLUP);              // hex data output pin

  // Initialize serial communications
  Serial.begin(115200);                                // Serial monitor
  Serial1.begin(8192);                                 // Serial port for ALDL data
  delay(1500);
  Serial.println("Ready for data capture");

  // Initialize variables
  i = 0;
}

void loop() {
  // Wait for silence on the ALDL line
  Serial.print("wait for silence ");
  SilenceFound = false;
  StartTime = micros();

  while ((micros() - StartTime) < 15000) {  // wait for 15 ms silence
    if (digitalRead(ALDLTestPin) == 0) {   // line activity resets timeout
      StartTime = micros();
    }
  }
  SilenceFound = true;

  while (SilenceFound == true) {
    // Send Mode 1 command
    bool PreambleDetected = false;
    while (!PreambleDetected) {
      Serial.print(" M1 cmd ");
      i = 0;
      byte M1Cmd[4] = {0x80, 0x95, 0x01, 0x00}; // Example command - adjust as needed
      for (i = 0; i < 4; i++) {
        Serial1.write(M1Cmd[i]);
      }

      Serial.println(" Finding Preamble ");
      i = 0;
      PreambleTimer = millis();

      // Search for preamble
      while ((millis() - PreambleTimer) < 100 && !PreambleDetected) {
        if (Serial1.available() > 0) {
          ALDLbyte = Serial1.read();
          if (ALDLbyte == Preamble[i]) {
            i++;
            if (i > 2) PreambleDetected = true; // found preamble
          } else {
            PreambleDetected = false;
            i = 0;
          }
        }
      }
    }

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

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

    // Send data according to output flags
    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) ");
      }
      // Process and display data
      RPM = DataBytes[11] * 25; // Engine RPM
      TPS = DataBytes[10] * 0.019608; // Throttle 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];

      // Print 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 data reading
      unsigned long StartTime = millis();
      while (millis() < StartTime + 3000) {
        if (Serial1.available() > 0) ALDLbyte = Serial1.read(); // flush buffer
      }
    } else if (digitalRead(HexDataOutputPin) == LOW) {
      // Hex 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;
      byte 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 data stream
      Serial.write(0x80);
      Serial.write(0x95);
      Serial.write(0x01);
      for (int j = 1; j < ByteCount + 1; j++) {
        Serial.write(DataBytes[j]);
      }
    }
  }
}

// Interpolates temperature from thermistor data
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;
}