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RACELOGIC Support Centre

05 - Speed Sensor Digital Input


The Digital Input can be used to program the position of virtual lines in the Speed Sensor allowing for the setting of Start/Finish & Split lines. You must first ensure that you have a connection to the Lap Input (pin 6). This pin should be connected to one side of a momentary switch and the other side of the switch connected to the Ground pin of the VBSS, so that when the switch is pressed the Lap Input pin will be shorted to Ground. The Digital Input can also be used for a Brake Trigger.  


VBOX Setup Software should be used to set the function of the Digital Input to either Lap pulse or Brake Trigger mode.  


Lap pulse mode

Set a Start/finish line: Press and immediately release the Lap input switch as you cross the start finish line. You must be moving >5 km/h to do this and following the normal line along the track. The VBSS notes the point and direction of travel, then creates a virtual line perpendicular to your line of travel 25 m wide.

Set a separate Finish line: press hold the switch for >1.5 seconds before releasing. After you have set a Start/Finish or Finish line you can view the Latitude and longitude of this line position in the ‘Tests’ page of the setup software. If the software was already connected then press ‘Connect’ again to refresh the settings.

Set a Split line: Press the button twice for a very short period, when this has been marked, the 2nd LED flashes quickly 5 times. The output from the split line should be identical in all respects with the first.

To clear all Virtual lines: Press the button shortly once followed by a longer button press (longer than 1.5 seconds). In each case the VBSS will recognise the lead edge of the first pulse as the activation in order to set the associated virtual line at the exact point that the user first presses the switch.

Coldstart: This can be performed by grounding the input while connecting the VBSS to power - all LEDS will show Red.

Brake Trigger mode

Enabling this mode allows the Digital Input to be used with a brake trigger. Activation of the trigger will start the brake stop distance measurement, where the VBSS will calculate a Time and Distance for a Brake Trigger to 0 km/h test. 

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