Good night.
I have installed a video module on my kuga with genuine wire installed, i compare my wire with a s-max wire and i have one wire more, this wire send a analog signal from a steering wheel angle sensor, 0V are to left, 6V in the middle and 12v to right (Aproximate) i dont know if the Mondeo / S-Max receive the angle sensor value from can bus os dont have this option.
In my kuga only show the lines when i move the steering wheel and show the rear parking lines only when the sensor see any obstacle.
i comment my experience for what it's worth.
Steering angle by analog-signal instead of CAN for reverse camera
-
oscarboiro
- Active member
- Posts: 123
- Joined: 19 Feb 2019, 21:50
Re: Steering angle by analog-signale instead of CAN for reverse camera
Hey Oscar! Very interesting information regarding the CMR. I split and moved your original post into separate topics, as this fit's best.
Kuga electrics is equal to Focus (where S-Max is equal to Mondeo) and in Focus, there is a separate wire like you said: It should be connected to Pin 10 of the module.
What you say is that as long as you don't move the steering wheel, there are not lines in the picture, right? I could test this with your measurements by applying a voltage on the pin of my Focus-CMR module to see if something happens.
On Mondeo the PDC-bars only shows up when there is an obstacle in range, so this behaves the same.
Kuga electrics is equal to Focus (where S-Max is equal to Mondeo) and in Focus, there is a separate wire like you said: It should be connected to Pin 10 of the module.
What you say is that as long as you don't move the steering wheel, there are not lines in the picture, right? I could test this with your measurements by applying a voltage on the pin of my Focus-CMR module to see if something happens.
On Mondeo the PDC-bars only shows up when there is an obstacle in range, so this behaves the same.
You do not have the required permissions to view the files attached to this post.
Re: Steering angle by analog-signal instead of CAN for reverse camera
Today i attached an 8M5T (Focus) module to my car (Mondeo). It gaves a picture but without lines and bars (hatch closed). I then applied a voltage trough a potentionmeter to pin 10 of the module, but still nothing changed. No lines appears.
Maybe, this is not simply a voltage (which would really suprise me) but it's a more common PWM signal you measured. Depending on your measurement equipment you measure the resulting voltage of the PWM. This would fit much more, because PWM has several advantages over an analog voltage:
- it is more reliable, less distortionable than a linear voltage. (only on/off signal which can be reconstructed)
- it can be transported over a long distance without loosing information
Because a PWM never uses full low (0V) and full high (12V) but has a little PWM spike on both ends, the module can detect if there is a signal or not. So, if there is no PWM on pin 10 it can tell there is no sensor attached.
Maybe if i attach a PWM, the lines show up? But you say that it will only show when moving the steering, right? Or when an object is detected by the ultrasound sensors.
Maybe, this is not simply a voltage (which would really suprise me) but it's a more common PWM signal you measured. Depending on your measurement equipment you measure the resulting voltage of the PWM. This would fit much more, because PWM has several advantages over an analog voltage:
- it is more reliable, less distortionable than a linear voltage. (only on/off signal which can be reconstructed)
- it can be transported over a long distance without loosing information
Because a PWM never uses full low (0V) and full high (12V) but has a little PWM spike on both ends, the module can detect if there is a signal or not. So, if there is no PWM on pin 10 it can tell there is no sensor attached.
Maybe if i attach a PWM, the lines show up? But you say that it will only show when moving the steering, right? Or when an object is detected by the ultrasound sensors.
Re: Steering angle by analog-signal instead of CAN for reverse camera
I've compared both types of modules and traced down a small difference. The 8M5T (Focus) module has some extra passive components, which are missing in the 9M5T:
Just a view resistors, EMI filters and caps. The two bigger pads seems to be testpoints. The righter one seems to go to the MC9S12 microcontroller on the other side, which make perfect sense.
So what's clear now it that 8M5T has parts to handle the steering wheel angle signal. What we currently not know is, which kind of signal this is. Maybe somebody with an DSO is able to make some measurements on that signal?
I'm pretty shure it is possible to "upgrade" such a module to the FW of the 9M5T to handle CAN steering angle.
So what's clear now it that 8M5T has parts to handle the steering wheel angle signal. What we currently not know is, which kind of signal this is. Maybe somebody with an DSO is able to make some measurements on that signal?
I'm pretty shure it is possible to "upgrade" such a module to the FW of the 9M5T to handle CAN steering angle.
You do not have the required permissions to view the files attached to this post.