OBD MPGuino gauge

[KJSatz]

I just worked up the courage, so I'm going to get an arduino kit now and then when you create the schematic for CAN I will follow it religiously . Thank you so much.

[electromike]

I have a quick question about the buttons. Does it matter if they are normally Open or normally Closed?

Also, I tried testing the new ISO code, and it didn't respond, but it might be my 33290 chip. I thought maybe you had it wired up wrong in your diagram, and switched the 5,6,7,8 pins around according to the picture on the spec sheets, But it caused a nice spark when i tried to plug in the obd connector. Turns out the picture on the data sheet is wrong, but the text and your diagram are right

[Nevyn]

Buttons are "Normally Open" I believe in the MPGuino version - when you push the button, it completes the circuit. Check the "release one workspace" thread post 1 - it shows the diagram of the buttons.

[electromike]

Thanks, yup, they are normally open in all the pictures. I think I was just secretly hoping that they were interrupt driven that made it so it didn't matter.. for example triggered on a rising edge...
I guess I will have to pick some of the proper ones up

[Magister]

For ISO, try to reach RussEnterprises, he told me he got the init done by modifying the code, ask him also how he wired his 33290

[KJSatz]

Ooh cool I see you have the new CAN interface with the MCP2551 and MCP2515 instead of the ELM327 up on the wiki! So cool! Do you have this working in your car? Could I see a picture of your interface?

And if I may ask a dumb question, where does the +5V come from? Edit Let me see if I can answer my own question and you tell me if I did it right. +12v comes from the OBD-II port, through the interface ("daughterboard") where there's the on/off switch, then to the +9V power pin on the Arduino. Arduino electrical regulation magic gives us +5V out on the +5V pin, where the interface gets the +5V.

[Magister]

you're right and here's some pic

front:


back:


I tested the code on full tanks, I still need to introduce a new parameter to adjust the fuel consumption, then work on a schematic anc a PCB

[KJSatz]

Such exciting progress! Thanks for all the work you're putting into this.

Man I'm such a lame cheerleader.

Would an iDuino work with this?

[foor]

I'm looking to find out if anyone has been able to get the ISO code working for obduino? RussEnterprises?
I have an ISO9141 vehicle, I built an interface using the MC33290, but I'm having trouble getting the communication initialized, it hangs on the iso_read_byte() from iso_init(). I have only tried v112, and it just displays the init screen. Any hints where to go from here?

[RussEnterprises]

Originally Posted by foor

I'm looking to find out if anyone has been able to get the ISO code working for obduino? RussEnterprises?
I have an ISO9141 vehicle, I built an interface using the MC33290, but I'm having trouble getting the communication initialized, it hangs on the iso_read_byte() from iso_init(). I have only tried v112, and it just displays the init screen. Any hints where to go from here?

I just got it working with ISO9141 using the MC33290 yesterday. It isn't well tested, and I haven't had a chance to send the code to Magister to be integrated into the google code release yet, though. If you want to PM me with your email address, I can send you the ISO9141 only code that works for me.

Russ