[ScorpiusWireless]

If you race analogue and you’re not into dead strips here’s a 8 lane wireless lapcounter.
You’ll need an overhead gantry of IR LEDs.
You’ll need 1 photo transistor installed in the track per lane.
You’ll need one pull up resistor per  photo transistor. 
You need 1 MPD.
A 12V power supply.
A NCD PR33-19 8 channel opto sensor. 
Just set up as per any wired set up. 
Instead of hardwiring back to PC, the PR33-19 plugs into MPD data port. From here it goes to Race Coordinator via Scorpius Dongle.

Here’s the sensor board by NCD.


   

$189 USD package 
MPD 
Dongle
Opto board 
IR LEDs
Photo transistors
Resistors.

Power supply required