Bought the ARC Pro for my son and spent 2 weeks trying to figure out why the app wouldn't count more than 1 lap.
Fault was apparent using any car on either lane on a basic oval track using 5 different devices. All other functions of the app worked including, calibration, lane change, braking, etc.
After following all the advice on the forums and contacting Scalextric I still could not use the ARC Pro as the most basic function of lap counting is required.
I came across this Magic ARC app whilst reading the mostly negative reviews of the official Scalextric app on Google play store.
Downloaded the Magic ARC app to android phone and the ARC Pro works perfectly!
I think it's quite embarrassing that the Scalextric app is inferior to an enthusiasts app... not taking anything away from the App creator 'Cristiano Ruisi' as it better in all areas.
If the official app only counts 1 lap, while the magic app counts laps correctly it is likely due to a faulty exit sensor. The two apps use different methods to avoid double counting of laps. The official app needs the exit sensor to be triggered before the next lap for that car can be counted. The exit sensor is inside the track base piece at the opposite end to the start/finish line. The Magic app does not use the exit sensor in this way... instead it requires a time delay before the next lap can be counter.
Causes of a faulty exit sensor can be:
1/ Internal plug and socket connectors not seated correctly.
2/ sensor board inserted 180 degress rotated... so lane 1 and lane 2 sensibg is reversed.
3/ internal fault on circuit board (unlikely).
Apologies for delay in providing this input...