How Can Arduino OBD2 ELM327 I2C-LCD HC05 Bluetooth Be Integrated?

The integration of Arduino Obd2 Elm327 I2c-lcd Hc05 Bluetooth creates a custom automotive diagnostic and data display system. By combining these components, users can access, interpret, and display real-time vehicle data, enhancing their understanding of vehicle performance, this is possible with resources available at OBD2-SCANNER.EDU.VN, that provides comprehensive guides and support for building and utilizing such systems. You will also discover how to overcome challenges that require innovative problem-solving and also get OBD2 code interpretations.

1. What is Arduino OBD2 ELM327 I2C-LCD HC05 Bluetooth Integration?

Arduino OBD2 ELM327 I2C-LCD HC05 Bluetooth integration involves connecting these components to create a custom system for reading and displaying vehicle diagnostic data. This system leverages the Arduino microcontroller to interface with a vehicle’s On-Board Diagnostics (OBD2) port via an ELM327 Bluetooth module. The data is then displayed on an I2C LCD screen, offering real-time insights into vehicle performance.

1.1 Understanding the Components

• Arduino: An open-source microcontroller platform used for building digital devices and interactive objects. (Source: “Getting Started with Arduino” by Massimo Banzi)
• OBD2: A standardized system used in modern vehicles to monitor engine performance and diagnose issues.
• ELM327: A microchip that translates the various OBD2 protocols into a simpler serial format for microcontrollers.
• I2C LCD: A type of liquid crystal display that communicates using the I2C protocol, simplifying wiring.
• HC05 Bluetooth Module: A Bluetooth module that allows wireless communication between the Arduino and other devices.

1.2 Why Integrate These Components?

Integrating these components allows for the creation of a custom, cost-effective solution for vehicle diagnostics and data display. This integration provides several benefits:

• Real-Time Data: Displays real-time data from the vehicle’s sensors, such as engine temperature, speed, and RPM.
• Customization: Allows for customization of the displayed data and the user interface.
• Cost-Effectiveness: Offers a cheaper alternative to commercial OBD2 scanners.
• Educational Value: Provides an excellent learning platform for electronics and automotive diagnostics.

1.3 Applications of the Integrated System

The integrated system has various applications, including:

• DIY Car Diagnostics: Allows car enthusiasts to diagnose and troubleshoot vehicle issues themselves.
• Performance Monitoring: Enables real-time monitoring of vehicle performance parameters.
• Custom Dashboards: Facilitates the creation of custom dashboards for displaying vehicle data.
• Data Logging: Supports logging of vehicle data for later analysis.

2. What Are the Prerequisites for Arduino OBD2 ELM327 I2C-LCD HC05 Bluetooth Integration?

Before starting the Arduino OBD2 ELM327 I2C-LCD HC05 Bluetooth integration, ensure you have the necessary hardware, software, and basic knowledge. This preparation will streamline the process and minimize potential issues.

2.1 Hardware Requirements

• Arduino Board: An Arduino Uno or Nano is commonly used due to their ease of use and availability.
• ELM327 Bluetooth OBD2 Adapter: This adapter serves as the interface between the vehicle’s OBD2 port and the Arduino.
• I2C LCD: A 16×2 or 20×4 I2C LCD is suitable for displaying data.
• HC05 Bluetooth Module: Used for wireless communication between the Arduino and other Bluetooth-enabled devices.
• Connecting Wires: Jumper wires are needed to connect the components.
• Power Supply: A power supply to power the Arduino, such as a USB cable or a 9V battery.

2.2 Software Requirements

• Arduino IDE: The Integrated Development Environment (IDE) is used to write and upload code to the Arduino board.

• Libraries: Necessary libraries for the I2C LCD and other components need to be installed in the Arduino IDE.

  • LiquidCrystal_I2C.h: For controlling the I2C LCD.
  • SoftwareSerial.h: For serial communication with the ELM327.

• Bluetooth Terminal App: A Bluetooth terminal app on a smartphone or computer for testing the Bluetooth connection.

2.3 Essential Knowledge and Skills

• Basic Electronics Knowledge: Understanding of basic electronic components and circuits.
• Arduino Programming: Familiarity with the Arduino programming language and IDE.
• Serial Communication: Knowledge of serial communication protocols.
• OBD2 Protocol: Understanding of the OBD2 protocol and its PIDs (Parameter IDs).

2.4 Setting Up the Development Environment

1. Install Arduino IDE: Download and install the Arduino IDE from the official Arduino website.

2. Install Libraries:

   • Open the Arduino IDE.
   • Go to Sketch > Include Library > Manage Libraries.
   • Search for LiquidCrystal_I2C and install the library by Frank de Brabander.
   • Ensure the SoftwareSerial library is included (it usually comes pre-installed).

3. Test the Arduino Board:

   • Connect the Arduino board to your computer using a USB cable.
   • Open the Arduino IDE.
   • Select the correct board and port from Tools > Board and Tools > Port.
   • Upload a simple sketch, such as the Blink example (File > Examples > 01.Basics > Blink), to ensure the board is working correctly.

3. How to Connect Arduino to ELM327 via Bluetooth?

Connecting the Arduino to the ELM327 via Bluetooth involves establishing a wireless serial communication link. This connection allows the Arduino to send commands to the ELM327 and receive vehicle data.

3.1 Hardware Connections

1. Connect the HC05 Bluetooth Module to the Arduino:

   • HC05 VCC to Arduino 5V
   • HC05 GND to Arduino GND
   • HC05 TXD to Arduino RX (typically digital pin 0, but use a software serial pin)
   • HC05 RXD to Arduino TX (typically digital pin 1, but use a software serial pin) through a voltage divider (1kΩ and 2kΩ resistors) to lower the voltage from 5V to 3.3V.

2. Connect the ELM327 to the Vehicle’s OBD2 Port:

   • Plug the ELM327 adapter into the OBD2 port of your vehicle. The OBD2 port is usually located under the dashboard on the driver’s side.

3.2 Software Configuration

1. Include Necessary Libraries:

#include <SoftwareSerial.h>

2. Define Software Serial Port:

SoftwareSerial BTSerial(10, 11); // RX, TX  (Use digital pins 10 & 11)

3. Initialize Serial Communication:

void setup() {
  Serial.begin(9600);
  BTSerial.begin(38400);  // Default baud rate for HC05
  delay(1000);
  Serial.println("Arduino Ready");
}

3.3 Pairing the HC05 with the ELM327

1. Enter AT Command Mode:

   • To configure the HC05, you need to enter AT command mode. This is typically done by holding a button on the HC05 module while powering it up, or by sending specific commands via the serial monitor.

2. Set the HC05 as Master:

BTSerial.println("AT+ROLE=1"); // Set as Master
delay(1000);

3. Pair with the ELM327:

   • First, inquire for available Bluetooth devices:

BTSerial.println("AT+INQ");
delay(5000);  // Allow time to list devices

*   The HC05 will list available Bluetooth devices. Identify the ELM327's address from the list (e.g., `XX:XX:XX:XX:XX:XX`).
*   Pair the HC05 with the ELM327 using its address:

BTSerial.print("AT+PAIR=XX:XX:XX:XX:XX:XX,20"); // Pair with ELM327, 20-second timeout
delay(5000);

4. Link to the ELM327:

BTSerial.print("AT+LINK=XX:XX:XX:XX:XX:XX"); // Link to ELM327
delay(5000);

3.4 Testing the Connection

1. Send AT Commands to ELM327:

BTSerial.println("ATZ"); // Reset ELM327
delay(1000);
String response = BTSerial.readString();
Serial.println(response);

BTSerial.println("ATE0"); // Disable echo
delay(1000);
response = BTSerial.readString();
Serial.println(response);

2. Verify the Response:

   • If the ELM327 responds with “OK” or a similar acknowledgment, the connection is successful.

3.5 Troubleshooting

• Incorrect Baud Rate: Ensure the baud rate in the Arduino code matches the baud rate of the HC05 (usually 38400).
• Voltage Levels: Use a voltage divider to ensure the RXD pin of the HC05 receives 3.3V instead of 5V from the Arduino.
• Pairing Issues: Make sure the ELM327 is powered on and advertising its presence.
• Code Errors: Double-check the Arduino code for any syntax or logical errors.

4. How to Interface Arduino with I2C LCD?

Interfacing the Arduino with an I2C LCD involves connecting the LCD to the Arduino via the I2C communication protocol. This simplifies the wiring and allows for easy display of data.

4.1 Hardware Connections

1. Connect the I2C LCD to the Arduino:

   • LCD SDA to Arduino SDA (A4 on Arduino Uno)
   • LCD SCL to Arduino SCL (A5 on Arduino Uno)
   • LCD VCC to Arduino 5V
   • LCD GND to Arduino GND

4.2 Software Configuration

1. Include Necessary Libraries:

#include <Wire.h>
#include <LiquidCrystal_I2C.h>

2. Define LCD Parameters:

LiquidCrystal_I2C lcd(0x27, 16, 2);  // I2C address 0x27, 16 columns and 2 rows

*   Note: The I2C address (0x27) may vary. Use an I2C scanner sketch to find the correct address.

3. Initialize LCD:

void setup() {
  Serial.begin(9600);
  Wire.begin();
  lcd.init();
  lcd.backlight();
  lcd.clear();
  lcd.print("Initializing...");
}

4.3 Displaying Data on the LCD

1. Clear the LCD:

lcd.clear();

2. Set Cursor Position:

lcd.setCursor(0, 0);  // Column 0, Row 0

3. Print Data:

lcd.print("Hello, World!");

4.4 Example Code

#include <Wire.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);  // I2C address 0x27, 16 columns and 2 rows

void setup() {
  Serial.begin(9600);
  Wire.begin();
  lcd.init();
  lcd.backlight();
  lcd.clear();
  lcd.print("Initializing...");
  delay(2000);
}

void loop() {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Temperature:");
  lcd.setCursor(0, 1);
  lcd.print(getTemperature());  // Replace with your temperature reading function
  delay(1000);
}

float getTemperature() {
  // Replace with your actual temperature reading code
  return 25.5;
}

4.5 Troubleshooting

• LCD Not Displaying Anything:

  • Check the I2C address. Use an I2C scanner sketch to find the correct address.
  • Ensure the LCD is properly connected to the Arduino.
  • Check the contrast potentiometer on the back of the LCD.

• Library Issues:

  • Make sure the LiquidCrystal_I2C library is correctly installed.
  • Verify that the library version is compatible with your Arduino IDE.

5. How to Read OBD2 Data with Arduino and ELM327?

Reading OBD2 data with Arduino and ELM327 involves sending commands to the ELM327 and interpreting the responses to extract vehicle data.

5.1 Initializing the ELM327

1. Send Initialization Commands:

void initializeELM327() {
  BTSerial.println("ATZ");       // Reset ELM327
  delay(1000);
  readResponse();

  BTSerial.println("ATE0");      // Disable echo
  delay(1000);
  readResponse();

  BTSerial.println("ATL0");      // Disable line feeds
  delay(1000);
  readResponse();

  BTSerial.println("ATS0");      // Disable spaces
  delay(1000);
  readResponse();

  BTSerial.println("ATSP0");     // Set protocol to auto
  delay(1000);
  readResponse();
}

2. Read Response Function:

String readResponse() {
  String response = "";
  while (BTSerial.available()) {
    char c = BTSerial.read();
    response += c;
  }
  Serial.println(response);  // Print response to serial monitor for debugging
  return response;
}

5.2 Requesting OBD2 Data

1. Send OBD2 PID Request:

   • To request data, send the appropriate PID (Parameter ID) to the ELM327. For example, to request engine coolant temperature (PID 05), send:

BTSerial.println("0105");  // Request engine coolant temperature
delay(100);
String response = readResponse();

2. Example of Common OBD2 PIDs:

   • 0100: Supported PIDs [01-20]
   • 0105: Engine Coolant Temperature
   • 010C: Engine RPM
   • 010D: Vehicle Speed
   • 010E: Timing Advance
   • 010F: Intake Air Temperature

5.3 Interpreting the Response

1. Remove Unnecessary Characters:

   • The response from the ELM327 may contain extra characters like spaces, carriage returns, and line feeds. Remove these to parse the data correctly.

2. Parse the Data:

   • The data is usually in hexadecimal format. Convert it to decimal for use in calculations.

int parseTemperature(String response) {
  int start = response.indexOf("4105");  // Find the start of the data
  if (start != -1) {
    String hexValue = response.substring(start + 4, start + 6);  // Extract the hex value
    int decimalValue = strtol(hexValue.c_str(), NULL, 16);  // Convert hex to decimal
    return decimalValue - 40;  // Convert to Celsius
  }
  return -100;  // Error value
}

5.4 Displaying Data on the LCD

1. Call Functions to Get and Display Data:

void loop() {
  int temperature = getEngineCoolantTemperature();
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Coolant Temp:");
  lcd.setCursor(0, 1);
  lcd.print(temperature);
  lcd.print(" C");
  delay(1000);
}

5.5 Example Code

#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <SoftwareSerial.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);
SoftwareSerial BTSerial(10, 11); // RX, TX

void setup() {
  Serial.begin(9600);
  BTSerial.begin(38400);
  Wire.begin();
  lcd.init();
  lcd.backlight();
  lcd.clear();
  initializeELM327();
}

void loop() {
  int temperature = getEngineCoolantTemperature();
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Coolant Temp:");
  lcd.setCursor(0, 1);
  lcd.print(temperature);
  lcd.print(" C");
  delay(1000);
}

void initializeELM327() {
  BTSerial.println("ATZ");
  delay(1000);
  readResponse();

  BTSerial.println("ATE0");
  delay(1000);
  readResponse();

  BTSerial.println("ATL0");
  delay(1000);
  readResponse();

  BTSerial.println("ATS0");
  delay(1000);
  readResponse();

  BTSerial.println("ATSP0");
  delay(1000);
  readResponse();
}

String readResponse() {
  String response = "";
  while (BTSerial.available()) {
    char c = BTSerial.read();
    response += c;
  }
  Serial.println(response);
  return response;
}

int getEngineCoolantTemperature() {
  BTSerial.println("0105");
  delay(100);
  String response = readResponse();
  return parseTemperature(response);
}

int parseTemperature(String response) {
  int start = response.indexOf("4105");
  if (start != -1) {
    String hexValue = response.substring(start + 4, start + 6);
    int decimalValue = strtol(hexValue.c_str(), NULL, 16);
    return decimalValue - 40;
  }
  return -100;
}

5.6 Troubleshooting

• No Response from ELM327:

  • Check the Bluetooth connection.
  • Ensure the ELM327 is properly initialized.
  • Verify that the correct PID is being requested.

• Incorrect Data:

  • Double-check the parsing logic.
  • Ensure the correct units are being used.

6. How to Troubleshoot Common Issues in Arduino OBD2 Projects?

Troubleshooting common issues in Arduino OBD2 projects involves systematically identifying and resolving problems related to hardware connections, software configurations, and communication protocols.

6.1 Bluetooth Connectivity Issues

1. Pairing Problems:

   • Issue: The Arduino fails to pair with the ELM327 Bluetooth adapter.

   • Solution:

     • Ensure the HC05 Bluetooth module is correctly configured as the master.
     • Verify the ELM327 adapter is powered on and discoverable.
     • Use the correct Bluetooth address of the ELM327 when pairing.
     • Check the baud rate settings for the HC05 module.

2. Unstable Connection:

   • Issue: The Bluetooth connection drops frequently.

   • Solution:

     • Check for interference from other Bluetooth devices.
     • Ensure the HC05 module is within range of the ELM327 adapter.
     • Use a more stable power supply for the Arduino and HC05.

6.2 Data Retrieval Problems

1. No Response from ELM327:

   • Issue: The Arduino sends commands to the ELM327, but receives no response.

   • Solution:

     • Verify the ELM327 adapter is properly plugged into the OBD2 port.
     • Ensure the vehicle’s ignition is turned on.
     • Check the serial communication settings (baud rate, data bits, parity, stop bits).
     • Try sending initialization commands (ATZ, ATE0, ATL0, ATS0, ATSP0) to the ELM327.

2. Incorrect Data Displayed:

   • Issue: The Arduino receives data, but it is not the expected values.

   • Solution:

     • Double-check the OBD2 PID being requested.
     • Verify the data parsing logic in the Arduino code.
     • Ensure the correct units and scaling factors are applied.

6.3 LCD Display Problems

1. LCD Not Displaying Anything:

   • Issue: The LCD remains blank after initialization.

   • Solution:

     • Check the I2C address of the LCD using an I2C scanner sketch.
     • Verify the wiring connections (SDA, SCL, VCC, GND).
     • Adjust the contrast potentiometer on the LCD.
     • Ensure the LiquidCrystal_I2C library is correctly installed and initialized.

2. Garbled Text or Incorrect Characters:

   • Issue: The LCD displays garbled text or incorrect characters.

   • Solution:

     • Check the LCD initialization parameters (number of columns and rows).
     • Verify the character encoding and font settings.
     • Ensure there are no conflicting libraries or code segments.

6.4 Power Supply Issues

1. Insufficient Power:

   • Issue: The Arduino or other components are not receiving enough power.

   • Solution:

     • Use a power supply that meets the voltage and current requirements of the Arduino and other components.
     • Check the wiring for any loose connections or shorts.
     • Avoid drawing too much current from the Arduino’s 5V pin.

2. Voltage Fluctuations:

   • Issue: The voltage supply fluctuates, causing erratic behavior.

   • Solution:

     • Use a regulated power supply.
     • Add decoupling capacitors near the power pins of the Arduino and other components.

6.5 Software and Library Conflicts

1. Incompatible Libraries:

   • Issue: Conflicting libraries cause compilation errors or unexpected behavior.

   • Solution:

     • Ensure all libraries are compatible with the Arduino IDE version.
     • Remove any unnecessary or conflicting libraries.
     • Update libraries to the latest versions.

2. Code Errors:

   • Issue: Syntax errors or logical errors in the Arduino code.

   • Solution:

     • Carefully review the code for any syntax errors or typos.
     • Use the Arduino IDE’s debugging tools to identify logical errors.
     • Test the code in small segments to isolate the source of the error.

6.6 General Troubleshooting Tips

• Check Wiring: Ensure all connections are secure and correctly wired.
• Use Serial Monitor: Utilize the Arduino IDE’s serial monitor for debugging and monitoring data.
• Test Components Individually: Test each component separately to ensure it is functioning correctly.
• Consult Documentation: Refer to the documentation for the Arduino, ELM327, HC05, and LCD.
• Seek Help Online: Consult online forums, communities, and resources for assistance.

7. What are Advanced Techniques for Arduino OBD2 ELM327 Integration?

Advanced techniques for Arduino OBD2 ELM327 integration involve implementing more complex functionalities and optimizations to enhance the capabilities of the system.

7.1 Data Logging and Storage

1. SD Card Module Integration:

   • Integrate an SD card module with the Arduino to log OBD2 data for later analysis.
   • Hardware: Connect an SD card module to the Arduino using the SPI interface.
   • Software: Use the SD.h library to read and write data to the SD card.

2. Real-Time Data Logging:

   • Log data with timestamps to track vehicle performance over time.
   • Code Example:

#include <SD.h>
#include <SPI.h>

File dataFile;
const int chipSelect = 10;

void setup() {
  Serial.begin(9600);
  if (!SD.begin(chipSelect)) {
    Serial.println("SD card initialization failed!");
    return;
  }
  dataFile = SD.open("datalog.txt", FILE_WRITE);
  if (dataFile) {
    dataFile.println("Timestamp,CoolantTemp,RPM,Speed");
    dataFile.close();
    Serial.println("Datalog initialized");
  } else {
    Serial.println("Error opening datalog.txt");
  }
}

void loop() {
  String timestamp = String(millis());
  int coolantTemp = getEngineCoolantTemperature();
  int rpm = getEngineRPM();
  int speed = getVehicleSpeed();

  String dataString = timestamp + "," + String(coolantTemp) + "," + String(rpm) + "," + String(speed);
  Serial.println(dataString);

  dataFile = SD.open("datalog.txt", FILE_WRITE);
  if (dataFile) {
    dataFile.println(dataString);
    dataFile.close();
  } else {
    Serial.println("Error opening datalog.txt");
  }
  delay(1000);
}

7.2 Custom PID Support

1. Accessing Non-Standard PIDs:

   • Some vehicles support custom PIDs that are not part of the standard OBD2 set.
   • These PIDs can provide additional data specific to the vehicle.

2. Sending Custom PID Requests:

   • Send the appropriate command to the ELM327 to request the custom PID.
   • Example: 01A0 might be a custom PID for a specific vehicle.

3. Interpreting Custom PID Responses:

   • Consult the vehicle’s documentation or online resources to understand the format and meaning of the custom PID response.

7.3 Fault Code Analysis and Display

1. Reading Diagnostic Trouble Codes (DTCs):

   • Use the 03 PID to read stored DTCs from the vehicle’s ECU.

2. Clearing DTCs:

   • Use the 04 PID to clear stored DTCs. Be cautious when clearing DTCs, as it may hide underlying issues.

3. Displaying DTCs on the LCD:

   • Parse the DTCs and display them on the LCD in a user-friendly format.
   • Example:

String getDTCs() {
  BTSerial.println("03");
  delay(100);
  String response = readResponse();
  return parseDTCs(response);
}

String parseDTCs(String response) {
  String dtcString = "";
  int start = response.indexOf("43");
  if (start != -1) {
    // Parse the DTCs from the response
    // Example: "P0101, P0300"
    dtcString = "P0101, P0300";  // Replace with actual parsing logic
  } else {
    dtcString = "No DTCs found";
  }
  return dtcString;
}

7.4 Wireless Data Transmission

1. WiFi Module Integration:

   • Integrate a WiFi module (e.g., ESP8266) to transmit OBD2 data to a remote server or mobile app.
   • Hardware: Connect the ESP8266 to the Arduino using serial communication.
   • Software: Use the ESP8266WiFi.h library to connect to a WiFi network and send data.

2. Bluetooth Data Streaming:

   • Stream OBD2 data to a mobile app via Bluetooth for real-time monitoring.
   • Software: Develop a mobile app that connects to the Arduino via Bluetooth and displays the data.

7.5 Real-Time Monitoring and Alerts

1. Threshold-Based Alerts:

   • Set thresholds for critical parameters (e.g., engine temperature, RPM) and trigger alerts if the values exceed these thresholds.

2. Visual and Audible Alerts:

   • Use LEDs and buzzers to provide visual and audible alerts.
   • Example:

const int overheatLED = 8;
const int rpmThreshold = 6000;

void setup() {
  pinMode(overheatLED, OUTPUT);
}

void loop() {
  int temperature = getEngineCoolantTemperature();
  int rpm = getEngineRPM();

  if (temperature > 100) {
    digitalWrite(overheatLED, HIGH);  // Turn on overheat LED
    Serial.println("Warning: Engine overheating!");
  } else {
    digitalWrite(overheatLED, LOW);   // Turn off overheat LED
  }

  if (rpm > rpmThreshold) {
    // Trigger RPM alert
    Serial.println("Warning: RPM exceeding threshold!");
  }
  delay(1000);
}

7.6 Integration with GPS Module

1. GPS Data Logging:

   • Integrate a GPS module to log vehicle location along with OBD2 data.
   • Hardware: Connect a GPS module to the Arduino using serial communication.
   • Software: Use a GPS library to parse the GPS data and log it along with the OBD2 data.

2. Geofencing:

   • Implement geofencing to trigger alerts when the vehicle enters or exits a defined area.

7.7 Custom Dashboard Development

1. Web-Based Dashboard:

   • Create a web-based dashboard to display OBD2 data in real-time.
   • Technology: Use HTML, CSS, JavaScript, and a web server to create the dashboard.
   • Data Transmission: Transmit OBD2 data from the Arduino to the web server using WiFi or Bluetooth.

2. Mobile App Dashboard:

   • Develop a mobile app to display OBD2 data on a smartphone or tablet.
   • Platform: Use a cross-platform mobile app development framework (e.g., React Native, Flutter) to create the app.

By implementing these advanced techniques, you can create a sophisticated Arduino OBD2 system that provides valuable insights into vehicle performance and diagnostics.

8. Case Studies: Successful Arduino OBD2 Projects

Examining successful Arduino OBD2 projects provides inspiration and practical insights into what can be achieved with this technology.

8.1 Project 1: Real-Time Dashboard for Classic Car

1. Objective:

   • Create a modern dashboard for a classic car using Arduino, ELM327, and an LCD.

2. Components:

   • Arduino Nano
   • ELM327 Bluetooth Adapter
   • 20×4 I2C LCD
   • HC05 Bluetooth Module
   • Custom Enclosure

3. Functionality:

   • Displays real-time engine temperature, RPM, speed, and voltage.
   • Logs data to an SD card for later analysis.
   • Provides visual alerts for critical parameters.

4. Implementation:

   • The Arduino Nano reads data from the ELM327 via Bluetooth.
   • The data is parsed and displayed on the 20×4 I2C LCD.
   • An SD card module logs the data with timestamps.
   • A custom enclosure houses the components and provides a clean, professional look.

5. Results:

   • The project successfully modernized the classic car’s dashboard, providing valuable real-time data.
   • The data logging feature allowed the owner to track the car’s performance over time.
   • The visual alerts helped prevent potential engine damage.

8.2 Project 2: Mobile OBD2 Scanner and Data Logger

1. Objective:

   • Develop a portable OBD2 scanner and data logger that can be used with a smartphone.

2. Components:

   • Arduino Pro Mini
   • ELM327 Bluetooth Adapter
   • HC05 Bluetooth Module
   • Android Smartphone
   • Custom PCB

3. Functionality:

   • Scans and displays diagnostic trouble codes (DTCs).
   • Logs data to a file on the smartphone.
   • Provides real-time monitoring of engine parameters.

4. Implementation:

   • The Arduino Pro Mini reads data from the ELM327 via Bluetooth.
   • The data is transmitted to an Android smartphone via Bluetooth.
   • A custom Android app displays the data and logs it to a file.
   • A custom PCB was designed to minimize the size and improve the reliability of the device.

5. Results:

   • The project created a portable and versatile OBD2 scanner and data logger.
   • The Android app provided a user-friendly interface for viewing and logging data.
   • The custom PCB improved the reliability and reduced the size of the device.

8.3 Project 3: Vehicle Performance Monitor with Web Dashboard

1. Objective:

   • Create a vehicle performance monitor with a web dashboard for remote data access.

2. Components:

   • Arduino Mega
   • ELM327 Bluetooth Adapter
   • ESP8266 WiFi Module
   • Web Server

3. Functionality:

   • Monitors real-time engine parameters.
   • Transmits data to a web server via WiFi.
   • Displays data on a web-based dashboard.

4. Implementation:

   • The Arduino Mega reads data from the ELM327 via Bluetooth.
   • The data is transmitted to a web server via WiFi using the ESP8266 module