This guide will show you: • What hardware is included on the OBD-II UART • The basics of OBD-II commands • How to hook this up over FTDI directly with your computer • How to hook this up to an Arduino and display information to an LCD Required Materials To follow along with the tutorial, you will need the following parts. Required Tools • • • A laptop Suggested Reading This tutorial does expect the user to have experience with basic electronics and serial communication. If you are unfamiliar with these concepts or need a refresher, check out these other tutorials. Board Overview On-Board Diagnostics, Second Generation (OBD-II) is a set of standards for implementing a computer based system to control emissions from vehicles. It was first introduced in the United States in 1994, and became a requirement on all 1996 and newer US vehicles. Other countries, including Canada, parts of the European Union, Japan, Australia, and Brazil adopted similar legislation. A large portion of the modern vehicle fleet supports OBD-II or one of its regional flavors.

Among other things, OBD-II requires that each compliant vehicle be equipped with a standard diagnostic connector (DLC) and describes a standard way of communicating with the vehicle’s computer, also known as the ECU (Electronic Control Unit). A wealth of information can be obtained by tapping into the OBD bus, including the status of the malfunction indicator light (MIL), diagnostic trouble codes (DTCs), inspection and maintenance (I/M) information, freeze frames, VIN, hundreds of real-time parameters, and more.

It seems people often approach this concept with an Arduino. Able to use a scan-tool to interface with a non-OBD. The Toyota diagnostic software. Testing my Arduino to OBD2 interface, using a bluetooth ELM327-clone - Project's page: https://thomwijtenburg.nl/arduino-obd-2-trip-computer/. This is loaded on the microcontroller over a USB or serial interface using the free Arduino. Based on the Arduino Mega, the OBDuino is extended.

You can read more about the OBD-II protocol. STN1110 is an OBD to UART interpreter that can be used to convert messages between any of the OBD-II protocols currently in use, and UART. It is fully compatible with the de facto industry standard ELM327 command set. Based on a 16-bit processor core, the STN1110 offers more features and better performance than any other ELM327 compatible IC. ScanTool has some great resources for the STN1110 available on their website, including: • • Board Schematic The OBD-II UART board has both the STN1110 and the MCP2551 chips populated on it, allowing the user to access both CAN and OBD-II protocols. The schematic can be viewed/downloaded.

The STN1110 is the main controller chip on the board. This communicates with the CAN, ISO and J1850 transceivers. Voltage on the board is regulated to both 5V and 3.3V for all of the components to function properly. The board is powered from the DB9 connector. Board Pin Out There are two different connection points on the board.

The first, on the outside edge of the board, is a 6-pin connector that is compatible with an FTDI board. However, only the TX, RX and GND pins are connected on this header, to allow for UART communication. There is a second 8-pin header close to the DB9 connector. This allows the user to tap into the VBAT line, the CAN bus, the LINE bus and the J1858 bus, along with the common ground pin.

Now that we now about the board itself, let’s move on to hooking it up! First Communcation Soldering Headers To create a solid electrical connection with any other components (such as an Arduino or an FTDI Basic), you need to solder headers to the board. For use with the FTDI Basic, it is easiest to solder male headers into the 6-pin header row at the edge of the board.

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Once you have this done, your board should look similar to this. OBD-II Board with Right-Angle Male Headers soldered onto it. Connecting to a Vehicle OBD Port You will need to connect the OBD-II board to the OBD port on your vehicle. Depending on the make and model of your car, the port location may vary.

Consult your owner’s maunal if you cannot locate the port. Once you have located your OBD port, you will need to hook up the OBD-to-DB9 cable to the vehicle’s port. Membuat cetakan paving dari kayu.

The mating end of the cable tends to be a very tight fit and require a bit of force to get it sitting securely, so it’s usually easier to start hooking everything together between the car and the cable. Once you get the car and the cable connected, then connect the DB9 end of the cable to the OBD-II board.

Connecting over a Serial Port Once you have your headers attached to your board, and you’ve connected to your vehicle using the OBD-DB9 cable, you can start communicating withe OBD-II board over through a serial port using an FTDI Basic breakout board. The FTDI pinout matches with the 6 pin header on the OBD-II board, but only connects TX, RX and GND. Connect the FTDI board to the computer via a mini-USB cable, and open up a serial terminal on your computer. Configure the serial connection to 9600 bps, 8 data bits, 1 stop bit and no parity. Once you have your serial terminal set up, you will communicate with the OBD-II board by using AT commands.