android-obd-reader

Android OBD-II Reader library that support standard PIDs (Mode 01) in Mobile and Head Unit (insatalled in Car).

Motivation

I was working for an application that read Car real time data through OBD-II. I found a library https://github.com/pires/obd-java-api , it is working fine in mobile, but there is problem to connect OBD with with Head Unit. So, for connectivity of Car Head Unit with OBD-II and read real time data, we spend lots of time because of no proper documentation and connectivity guide. Therefore, I developed this library so that if anyone looking for the same, they can use and save time.

Feature

Check which PIDs supported in your vehicle if you do not set any command. Based on standard PIDs, we are calculating followings:

• Distance Traveled
• Idle Time
• Driving Time
• Max Speed in one Trip
• Max RPM
• Idling Fuel Consumtion
• Driving Fuel Consumtion
• Instant Fuel Consumtion
• Rapid Acceleration Times (How many times speed increases very fast)
• Rapid Declaration Times (How many time emergency brake is used)

Source Enviourment

• Android Studio : 3.0.1
• Gradle : 3.0.1

Project Configuration

• minSdkVersion 15
• targetSdkVersion 26
• compileSdkVersion 26

Getting Started

Add the following to your build.gradle to use:

dependencies {

compile 'com.sohrab:obd-reader:1.0.0'

}

Usage

• Follow sample-app:

ArrayList<ObdCommand> obdCommands = new ArrayList<>();
     obdCommands.add(new SpeedCommand());
     obdCommands.add(new RPMCommand());
     ObdConfiguration.setmObdCommands(this, obdCommands);

//If you want to read all standard PIDs commands, pass null in the second argument like        
       ObdConfiguration.setmObdCommands(this, null);

//Set gas price per liter so that gas cost can be calculated accordingly. Default is 7 $/l
float gasPrice = 7; // per litre, you should initialize according to your requirement.
ObdPreferences.get(this).setGasPrice(gasPrice);

//Register receiver with some action related to OBD connection status and read PID values
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(ACTION_READ_OBD_REAL_TIME_DATA);
intentFilter.addAction(ACTION_OBD_CONNECTION_STATUS);
registerReceiver(mObdReaderReceiver, intentFilter);

//start service that keep running in background for connecting and execute command until you stop
startService(new Intent(this, ObdReaderService.class));

//Broadcast Receiver to receive OBD connection status and real time data
BroadcastReceiver mObdReaderReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {            
	 String action = intent.getAction();
            if (action.equals(ACTION_OBD_CONNECTION_STATUS)) {
                String connectionStatusMsg = intent.getStringExtra(ObdReaderService.INTENT_OBD_EXTRA_DATA);                                             if (connectionStatusMsg.equals(getString(R.string.obd_connected))) {
                    //OBD connected  do what want after OBD connection
                } else if (connectionStatusMsg.equals(getString(R.string.connect_lost))) {
                    //OBD disconnected  do what want after OBD disconnection
                } else {
                    // here you could check OBD connection and pairing status
                }
            } else if (action.equals(ACTION_READ_OBD_REAL_TIME_DATA)) {
                TripRecord tripRecord = TripRecord.getTripRecode(SampleActivity.this);                
                // here you can fetch real time data from TripRecord using getter methods like
                //tripRecord.getSpeed();
                //tripRecord.getEngineRpm();
            }
        }
    };	

Tested

• Head Unit (Generally used in Cars)
• Mobile

Author

Sohrab Alam

License

This project is licensed under the Apache License, Version 2.0 - see the LICENSE.md file for details