ALWR sensors with (quasi) potentiometer output

Hello,

I want to find a cost-effective and robust way to measure the suspension travel of the axles on a vehicle. I thought that ALWR level sensors would be suitable for this application, as they are specifically designed for this purpose and are relatively inexpensive.

From various SSP documents, I received information that at least some/current sensors have a PWM output, which is not suitable for my needs. I would need a proportional voltage signal, similar to what you would get from a potentiometer or a Hall effect 'potentiometer.'

Does anyone know if such sensors exist within the VAG group, and if not, whether other manufacturers offer them?

Sure, no problem.
Lukas.


*) I am aware of the possibility of cascading amplifiers, but I am hesitant due to the additional complexity and bandwidth loss.

Hello Lukas,

A PWM signal can be very easily converted into an output voltage, for example, using an RC circuit.
http://lmgtfy.com/?q=pwm+rc+glied

Best regards, Rainer.

Hello Rainer,

As mentioned before, I would actually like to avoid the PWM conversion using a low-pass filter. The reason is the bandwidth loss that occurs with sufficient damping, and I would also like to be able to evaluate faster changes in the output signal.

Do the numbers '200Hz' and '800Hz' printed on the sensors actually correspond to the PWM frequency?

Regards,
Lukas.

I thought that the ALWR (Adaptive Load Relief) in the Golf IV, for example – which, as you already have optimal recordings of – is evaluated linearly as a resistance value?

Okay, I've now acquired some sensors, and I will provide the answer here for all users of search functions/engines.


6-pin sensor, e.g., 4B0 907 503 or 8E0 907 503:
Supply voltage: +5V
Output: Voltage signal, proportional, active angle: 120° (8E0)
Pin assignments: 1 = GND (usually brown); 4 = Signal; 5 = +5V (often black); 6 = possibly PWM for other sensors.

4-pin sensors, e.g., 1T0 907 503.
Supply voltage: +5V
Output: PWM, proportional, frequency according to. Printing (200Hz at 1T0).
Pin assignments: 1 = GND; 2 = +5V; 3,4 = PWM.

Thank you to Octavia_4x4, you were right.

Regards,
Lukas.

Thank you for the feedback!

Hello,

I'm glad it helped. The advantage of the 3B0... sensor is that it's the original factory sensor for the Golf IV with Xenon headlights, which means you can install it directly with the correct stabilizer links without any modifications.

Please note: different mounting brackets/tie rods are available for 4motion and front-wheel drive vehicles.