Nice to see your dialogue on my case.
I've looked at the sensors from Maxbotix earlier and ruled them out on count of the price. Nice to see that we think the same way. This is just supposed to be a cheap simple project in my spare time.
Lasers legal or not don't bother me that much so I'll go with that option, but then the issue still is the small light resistor. The solar panel should be a much better idea then. The time gate system is what I'm aiming for, just didn't knew the name for it.
Any hints for a suitable solar panel and how that would work?