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Obd2spy Serial: The Benefits of Using It with OpenOBD Software



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First of all, thank you! You did a great job on writing up the process you used. I am working on hacking the volt and but I cannot seem to connect to the ELM327. I have both the ScanTool ElmScan 5 and the BAFX Products ELM 327 Bluetooth OBD2 scan tool. I have tried both and cannot connect to the adapter. Hyperterminal sees COM3 and COM4 for the adapters but I cannot connect. Likewise with the slick USB serial app. I am sure I am missing something basic. Any thoughts?




Obd2spy Serial




as far as the overflow, are you using a Bluetooth adapter by chance? i found that they often have that issue with the amount of data the ATMA command spews. a BT adapter can work for a finished project if you are able to issue a command that streams less data, but for the initial hacking i found that a USB adapter and a regular PC/Mac with a serial terminal app works best.


I have lots of modules and CPU boards as well as various CANBus shields, I also have a CAN Crocodile and a CANBus cable for serial to ODBII. If I follow this post is it possible to capture the indicators, brakes and lights from the bus using the ODBII cable?


If you have a newer laptop that does not have the 9 pin serial RS-232 interface built in and has a USB only interface, order the OBD2Allinone with USB interface. You can use our serial version OBDII PC scan tool on a USB only PC by adding a USB to Serial converter. You can either buy a USB to serial adapter, or buy a PCMCIA PC card that has a RS-232 serial 9 pin interface. These serial adapters are sold with a disk that contains the software drivers needed to make them work. Buy one that can be returned in case it does not work properly on your computer, especially with the USB adapter. There are reports of compatibility problems with these USB to serial adapters, and they can be tricky to get working properly on certain computers. Ultimately it is easier to order the OBD2Allinone with USB interface. The Diagnostic Software - FreeThe last item needed is the diagnostic software that will run on your PC or handheld to collect and record the data from your OBD-II system. There are a number of excellent software packages available, with some of them being free and others giving you a trial or demo mode. Screen shots and links to each website are provided below for a few of the software packages we have tested and work well with the OBD 2 AllInOne scan tool. We're not endorsing one scanning package over another, as they all have their place and will provide critical data. Below are screen shots of some of the software packages. There are many more screens to all of these packages, we've just included a few for viewing here. You can click on the image to get a larger view, and clicking on the title link below the picture will take you to the manufacturers website for each of these OBD-II packages. We provide a software CD with all OBD2Allinone units. Scanmaster


We have found that all of the above packages are free downloads that work with our OBD 2 Allinone scan tool, with all protocols: ISO, VPW, PWM, KWP2000 and CAN (The free Scanmaster version does not currently work with CAN). Read the documentation for the particular software package you are using for more detail. The OBD2 AllInOne scan tool is built using the ELM327 processor chip, for which many software packages have been written. This chip is used by a number of manufacturers and as time goes on, more and more software packages will be developed for it. This will ensure a variety of packages readily available to everyone, with more and better features in future versions. The OBD2 AllInOne scan tool is able to operate at 2 different communication speeds that are user selectable, to insure compatibility with existing and future software packages. In Car Operation (Click the image at the right to view a short video.) In car operation is fairly straight forward. Ideally it takes just a few steps: plug the OBD-2 cable connector into your OBD port under the dash and then plug the other end into our OBD2 All-In-One unit. The power light for the OBD2 All-In-One unit will then come on. Then plug the provided serial or USB cable into the other end of the OBD2 All-In-One unit and then the 9 pin RS-232 serial port or usb connector into your laptop. Have your PC turned on and start whatever data collection software you have downloaded, and turn the car key forward to start the communication between your cars ECU/PCM and the PC. You can view your cars sensor data, read diagnostic trouble codes if any are set, and clear the diagnostic trouble codes. Some packages provide freeze frame data, which is all the cars sensor data at the time a particular trouble code was set. Some packages allow data logging for viewing later on with extensive color graphing capabilities. Other packages have built in dynomometer calculations so you can in effect have your own chassis dyno.


Via the included serial cable, this adapter is used as an interface to connect virtually all OBD-II compliant vehicles to a PC for on-board diagnostics (OBD). Such vehicles are VW, Audi, Seat, Skoda, Opel, Vauxhall, Alfa, Mercedes, Smart, Renault, BMW, Peugeot, Citroen, Lotus, Ford, Rover, Aston Martin, Ferrari, etc.


This board allows you to interface with your car's OBD-II bus. It provides you a serial interface using the ELM327 command set and supports all major OBD-II standards such as CAN and JBUS. The board also provides a footprint which mates directly to our FTDI Basic. The DB9 connector mates with our DB9 to OBD-II cable listed below.


Had an issue with the 3 year old Arduino example - appears Arduino changed serial behavior so that Serial.flush() no longer clears all the junk out of the input buffer so you have to make a function to empty it out before issuing a command.Replace Serial.flush() with something like this:// clear the input buffervoid serialFlush() while(Serial1.available() > 0) char t = Serial1.read();


Hi everyone. I hope someone could give us a hint about this board. We've got it working with an Arduino Mega connected to the hardware serial pins. We have got an ECU simulator that simulates almost all the protocols. When we test the board with all the protocols, the speed at which the data gets outputted is very slow. I have also tested with 4 cars, 2 are pre CAN BUS and the other 2 are CAN BUS. Even with those cars the rate at which the data gets outputted is slow too. Is this supposed to be like this or the rate should be faster? Thanks.


I'm using the OBD UART shield with an Arduino (on tx/rx) with the OBD.cpp/.h library. When doing Serial.print statements, it has erratic output to the serial monitor. Is this normal? (Im using 9600 baud)


I had the same problem. This is caused by sending any characters on the UART after you have issued a command. So if your serial terminal is sending CRLF (carriage return, line feed), change it to only send CR after you press enter. This solved the problem for me.


This interface works like a charm, it accepts all ELM327 commands with no problems. Interfacing it with the serial port of Arduino it's easy. One of the best products of SparkFun IMHO.Nice to have: the same card (optionally) without the DB9 connector. I would prefer to solder the wires directly on the PCB. In fact, the connector grabs a lot of vertical space in your enclosure box. 2ff7e9595c


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