Black Box - OBD-Pi Using Raspberry Pi

Raspberry Pi 3 Model B

Arduino IDE

Arduino UNO

USB-A to Micro-USB Cable

RASPIAN SOFTWARE

<p ></p><div class="se-component se-video-container __se__float-none" contenteditable="false" style="width: 100%;"><figure style="width: 100%; height: 56.25%; padding-bottom: 56.25%; margin: 0px;"><iframe frameborder="0" allowfullscreen="" src="https://www.youtube.com/embed/SVHaaNgbu7Q" data-proportion="true" data-percentage="100%,56.25%" data-size="100%,56.25%" data-align="none" style="width: 100%; height: 100%;" data-index="0" data-file-size="0" data-origin="100%,56.25%"></iframe></figure></div><p >In this tutorial, you will learn how to connect your Raspberry Pi to a Bluetooth OBD-II adapter and display real-time engine data to your car's aftermarket head unit!</p><h3 ><span >Step 1: Hardware Required:</span></h3><figure><img src=https://projects.arduinocontent.cc/927300f6-8acb-48cf-8b62-d8d4ee261d42.jpg /><figcaption> </figcaption></figure><ul ><li >Raspberry Pi Model B or B+</li></ul><ul ><li >Aftermarket head unit (Note: Must support Auxiliary input)</li></ul><ul ><li >Plugable USB Bluetooth 4.0 Low Energy Micro Adapter</li></ul><ul ><li >2A Car Supply / Switch or Micro USB Car Charger</li></ul><ul ><li >ELM327 Bluetooth Adapter or ELM327 USB Cable</li></ul><ul ><li >RCA cable</li></ul><ul ><li >Keyboard (*optional)</li></ul><h3 ><span >Step 2: What Is OBD-II?</span></h3><figure><img src=https://projects.arduinocontent.cc/c34669dd-14dc-4aa3-94de-d228de48092d.jpg /><figcaption> </figcaption></figure><p >OBD stands for On-Board Diagnostics, and this standard connector has been mandated in the US since 1996. Now you can think of OBD-II as an on-board computer system that is responsible for monitoring your vehicle’s engine, transmission, and emissions control components. </p><p >Vehicles that comply with the OBD-II standards will have a data connector within about 2 feet of the steering wheel. The OBD connector is officially called a SAE J1962 Diagnostic Connector, but is also known by DLC, OBD Port, or OBD connector. It has positions for 16 pins, and looks like this:</p><h3 ><span >Step 3: PyOBD?</span></h3><p ><a href="https://github.com/sakurusurya2000/pyobd">pyOBD</a><span > (aka pyOBD-II or pyOBD2) is an open source OBD-II (SAE-J1979) compliant scantool software written entirely in Python. It is designed to interface with low-cost ELM 32x OBD-II diagnostic interfaces such as ELM-USB. It will basically allow you to talk to your car's ECU, display fault codes, display measured values, read status tests, etc.</span></p><p ><span >I took a fork of pyOBD’s software from their GitHub repository, </span><a href="https://github.com/peterh/pyobd">https://github.com/peterh/pyobd,</a><span > and used this as the basis for my program.</span></p><p >The program will connect through the OBD-II interface, display the gauges available dependent on the particular vehicle and display real time engine data to the cars aftermarket head unit in an interactive GUI. </p><h3 ><span >Step 4: Software Installation</span></h3><p >Before you start you will need a working install of Raspbian with network access.</p><p >We'll be doing this from a console cable connection, but you can just as easily do it from the direct HDMI/TV console or by SSH'ing in. Whatever gets you to a shell will work!</p><p >Note: For the following command line instructions, do not type the '#', that is only to indicate that it is a command to enter.</p><p >Before proceeding, run:</p><pre ><code ><span >#  sudo apt-get update<br></span><span >#  sudo apt-get upgrade<br></span><span >#  sudo apt-get autoremove<br></span><span >#  sudo reboot<br></span></code></pre><p >Install these components using the command:</p><pre ><code ><span >#  sudo apt-get install python-serial<br></span><span >#  sudo apt-get install bluetooth bluez-utils blueman<br></span><span >#  sudo apt-get install python-wxgtk2.8 python-wxtools wx2.8-i18n libwxgtk2.8-dev<br></span><span >#  sudo apt-get install git-core<br></span><span >#  sudo reboot<br></span></code></pre><h3 ><span >Step 5: Vehicle Installation</span></h3><figure><img src=https://projects.arduinocontent.cc/fafce171-31c4-4938-86cf-fc3d14a10714.jpg /><figcaption> </figcaption></figure><p >The vehicle installation is quite simple.</p><ul ><li >1. Insert the USB Bluetooth dongle into the Raspberry Pi along with the SD card.</li></ul><ul ><li >2. Insert the OBD-II Bluetooth adapter into the SAE J196216 (OBD Port) connector.</li></ul><ul ><li >3. Connect you RCA cable to the back of your aftermarket head unit and plug the other end into your Raspberry Pi.</li></ul><ul ><li >4.Install your 2A Car Supply / Switch or Micro USB Car Charger.</li></ul><ul ><li >5. Finally turn your key to the ON position and navigate your head unit to Auxiliary input.</li></ul><ul ><li >6. Enter your login credentials and run:</li></ul><pre ><code ><span ># startx <br></span></code></pre><ul ><li >7. Launch BlueZ, the Bluetooth stack for Linux. Pair + Trust your ELM327 Bluetooth Adapter and Connect To: SPP Dev. You should see the Notification "Serial port connected to /dev/rfcomm0"</li></ul><p >Note: Click the Bluetooth icon, bottom right (Desktop) to configure your device. Right click on your Bluetooth device to bring up Connect To: SPP Dev.</p><ul ><li >8. Open up Terminal and run:</li></ul><pre ><code ><span >#  cd pyobd-pi<br></span><span >#  sudo su<br></span><span >#  python obd_gui.py<br></span></code></pre><p >Use the Left and Right arrow keys to cycle through the gauge display.To exit the program just press Control and C or Alt and Esc.</p><h3 ><span >Step 6: Data Logging</span></h3><figure><img src=https://projects.arduinocontent.cc/e9e92698-9450-4585-8f7a-c638d6c25445.jpg /><figcaption> </figcaption></figure><p >If you would like to log your data run:</p><pre ><code ><span >#  cd pyobd-pi<br></span><span >#  python obd_recorder.py<br></span></code></pre><p ><span >The logged data file will be saved under: </span><em >/home/username/pyobd-pi/log/</em><strong >Enjoy and drive safe!</strong></p><h3 ><span >Step 7: Step by Step Video</span></h3><figure><img src=https://projects.arduinocontent.cc/9592b715-2042-4fbd-9908-094fe7b1675c.jpg /><figcaption> </figcaption></figure><p ></p><div class="se-component se-video-container __se__float-none" contenteditable="false" style="width: 100%;"><figure style="width: 100%; height: 56.25%; padding-bottom: 56.25%; margin: 0px;"><iframe frameborder="0" allowfullscreen="" src="https://www.youtube.com/embed/SVHaaNgbu7Q" data-proportion="true" data-percentage="100%,56.25%" data-size="100%,56.25%" data-align="none" style="width: 100%; height: 100%;" data-index="0" data-file-size="0" data-origin="100%,56.25%"></iframe></figure></div><p ></p>

Black Box - OBD-Pi Using Raspberry Pi

Our project is a black box - OPD-Pi using Raspberry Pi.