CanBus for Beginners - Super Simple

So you need the V-Bus. So you only need to figure out Can High and Can Low

thank you for your answer, but how to determine Can High and Can Low.
I block.

Fendt 828 scr. 2 can high yellow 3 can low green

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Thank you very much, that’s much clearer to me.

Hello,
I come back to a subject that dates back.
I use AGO on a Fendt in canbus, I can’t get the Big Go and END triggered in the pounds.
the engagement of the guidance works very well with the little Go.

and is it possible to send me the direction parameters and set them to activate big Go and End.

I thank you

The triangular one on the second picture looks good. Looks like located right side under the seat. Is there a label on it? Also in our tractor the leads have letters on them. Look after X230.

Has anyone tried to CAN-drive a Claas Lexion with the Autopilot valve under the cab?

Hello, does the “Autosteer USB AgOpen GPS V5CanBus” sketch for Uno also work with Ag Open 5.6.15 version, or are there any changes in the meantime?

What do you use that sketch for?

Drive New Holland T7, Uno with Can Shild, currently with Ag Open Version 5.5. Would like to update to 5.6.15 or later. On the Uno is CAN BUS AOG V5 from 4 Feb 2021. Does the sketch still have to be changed for this, or does it work like this?

It should still work, but it also could do with some updates as there is ways to do a few things better

Well done! We need this kind of information for our project! May I ask how you managed to find out which PGN and which bytes on the vehicle bus are used for the speed. Did you start with a known ISOBUS message and then looking for a vehicle bus message with same values …?

Hi Guys,

i need a little help.
I would connect a Case Puma with MechanicTony Teensy board like this

If i connect the Pins H and J behind the seat with CAN3 an the board i have a connection. I see the steering angle. The simulator is on. but i could not manually move the tires. To isobus i have also no connection.

Has anywone a Idea?

Thanks

Remember that the tractor must be moving for the wheels to turn.
If the tractor has never worked with navigation, you must enter the H menu and configure the valve.

HH Menu is done.

good then i trie to drive

Hi all,

Im trying to get my fendt 722 on agopen, did the things like steering with a small angle steering sensor all with succes. The guys helped me the most are Commonrail and Alan by posting their findings, shout out to them (Y)

Now i’ve set up a prototype with the teensy 4.1, BNO, f9p, LM2596 and 3 can bus receivers. Alan did the most of the research i just read a lot and just trie. And because of a picture of his setup i could make my own prototype and im good to go i think. But…

Im a little bit scared of destroying anything. On all the reading and studying scheme’s pictures pcb’s etc i see diodes and resistors, on the picture of Alan’s setup on the rooftop Fendt i don’t see any. Can i try it without? Or do i requesting the gods :smiley:

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Diodes aren’t required for driving via the CAN bus. They usually are used in conjunction with driving a steering motor or controlling the coils on the hydraulic valve block directly. If you’re doing all your control via CAN, the CAN transceiver chips do all the signaling in the silicon and are self-contained. A 120 ohm resister between CAN HI and CAN LO might be required depending on where in the CAN bus you’re connecting. But worst case without the resister it just won’t work and you’ll get CAN errors on the tractor. But it can’t harm the tractor. Working with CAN is fairly safe. CAN was designed to be a very robust system and can deal with dead shorts even in a safe manner.

Thanks (Y)

this weekend i’ll try to connect

Really sorry, I now remember your message. Lots going on and I forgot to reply. No Diodes or resistors needed. This is the stripboard circuit I use now. Jusi some small capacitors on the transceiver power pins. No pictures of the other side. It’s quite ‘busy’ but you get the idea of what I used. The BNO085 is mounted separately, as it was on my prototype setup. GPS serial and Ethernet comms are also on it now but I can’t find that picture either. It has worked well until the steering rotation sensor on the tractor developed a fault. I now need to remove the cab to replace the sensor! :dizzy_face:

[Edit…]

Found a very poor later picture showing the ethernet kit and GPS tx/rx coming in top left on the pcb.

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Yeah, basically just looking at the bus traffic with wireshark and trying to spot the signals. Nasty work :smiley: