Using Trimble gyroscope as a WAS?

Morning all

Mate has this fitted to his Case - wondered if it was worth working with the existing WAS rather than fitting my own? 4-pin connection rather than the typical AOG 3 tho…

That kind of was need at least an encoder on steering wheel.

Ah, so a non-starter then. Thanks for quick reply !

The gyro communicates by broadcasting CAN bus messages. It might also require sending it messages from the GPS so it knows when it’s moving. If CAN messages could be decoded, it could be useful in the distant future but not anytime soon.

I don’t think it takes any input from the steering wheel. As far as I know the steering wheel encoder just tells the NAV II to disengage when you move it. I know from experience this gyro is pretty squirly starting out from a dead stop because it has no initial idea where it’s pointed.

1 Like

Took this off the tractor today, and have connected it up on the bench. Can’t really get anything meaningful out of it, sadly… Will try again tomorrow tho!

The note here about this being a relative deviation sounds like it integrates more with the Trimble than I’d expected however…

1 Like

Yeah sounds like it needs a j1939 CAN bus GPS feed to function. I assume it starts broadcasting angle measurements over CAN as well. The only way I can think of to test it is on a machine while it’s running to sniff the CAN communication.

In reality they don’t actually work that well. Sometimes my sprayer weaves when starting out from a dead stop as the gyro reading doesn’t start out very accurate. In my mind a direct angle sensor is going to be the most accurate and reliable.

I think a good gyro can do what trimble gyro do as well. As I can understand a gyro based was do computations based on IMU in the cab and gyro was rotation differences, since gyro based was dont came out an absolute angle.

Not so sure about CAN being involved on that one, it’s an older tractor (tho of course, the loom and kit could be using CAN internally)

This looks like the documentation for it, and the system’s wiring is pretty much self-contained (see page 130):

I did find a wiring diagram that explains:
P6-1 - Brown, Steering Sensor 5V+ IN
P6-2 - Red/White, SS 5V- IN
P6-3 - Orange, SS 5v+
P6-4 - Yellow, SS GND

That corresponded exactly with the colours we had. Came across these last night as well.

Inside autosense

what it outputs etc

that video mentions 60 degrees, and says to drive in a straight line for 60 seconds. We had a max of 60 degrees reading at one point and it wouldn’t shift at all, so am hoping that if we’d just kept going, it might have righted itself