EVSM Input signals

EVSM Input signal specifications

The sound module produce an electronic engine sound with a simulated RPM that is proportional to the engine RPM or the speed of an electric vehicle. The different sound characters and sound volume is then determined from information about the RPM and rate of RPM change.
The requested input signal type is set with the included SoundRacer Windows program and stored on the MicroSD card.


Analog signal input

In some vehicles it is possible to find a voltage that increases with the vehicle speed.

One example is this electric scooter where the speedometer has a voltage input, http://www.youtube.com/watch?v=y39w3zX0XGw.

EVSM analog input is 0 – 3,9V. At 0V there is idling sound and at 3,9V it is a max RPM sound.


Frequency signal input

This input requires voltage pulses from a sensor on a rotating object like a wheel or shaft. It can also be pulses from a motor controller.

When the rotation speed increase, the pulses comes more often = higher frequency.

A typical sensor is a Hall element that produce pulses when a magnet passes by.

See example here http://www.youtube.com/watch?v=bNnAyVgrdgA (video shows an older sound module without MicroSD card for the sound files)

Pulses should be at last 3V. The Hall sensor in the video is connected directly to the sound module and can be ordered together with magnets and the sound module.

The requested max input frequency is set with the included SoundRacer Windows program and stored on the MicroSD card.


Inputs Pulsed Analog
Input signal 3,5 – 19V 0 – 3,9V
Input resistance 0V – 4V 110 kohm 22 kohm
Input resistance 4V – TVS 10 kohm 10 kohm
Transient Voltage Suppressor 20V 5V


CAN bus

For CAN bus input we supply an external CAN interface that is connected to the Frequency signal input.

If the vehicle CAN protocol is not alredy implemented in the CAN interface then it can be updated online with the RUI interface.