Speeduino includes Vehicle Speed Sensing option that senses speed by measuring pulses in speeduino input. Other VSS input options aren't yet supported.
-**VSS input mode** - Select between "Pulses per KM" or "Pulses per mile" depending on which one is preferred. If VSS is not used, set this to Off.
-**VSS Pin** - Select what input pin is used for VSS signal.
> **Note:** In Arduino Mega you need to use pins that have external interrupt capability. These pins are 2, 3, 18, 19, 20 and 21. Other pins in Arduino Mega wont work for this purpose.{.is-info}
### VSS calibration
-**Pulses Per KM(pulses)** - You can set manually how many pulses at VSS input equal one kilometer travel distance. Or you can drive speed of 60km/h and click "60km/h auto-calibrate" button to set pulses per km setting automatically.
-**Smoothing Factor(%)** - A smoothing factor to help reduce noise in the VSS signal. Typical values are between 0 and 50
