I've been searching for a while now for a beam-break sensor utilising a reflector panel instead of a sender/receiver-setup. My goal is to detect presence in the vicinity of the sensor and up to about 15m from it.
So far I've been using a sender/receiver setup with batteries and solar panels on one side. However even after upgrading the battery capacity and putting in another solar panel, there is not enough light during the daytime this time of year.
Do you know of a sensor I can buy that will utilise a retroreflector over that distance?
Can I build one myself with an Arduino (or the like) without burning my retinas on an IR laser?
I'd rather not begin to construct advanced enclosures with lenses and such. The perfect setup could be a red(?) laser modulated to a frequency, installed right next to - but not interferring with - a sensor able to detect the reflected light.
Do you know if this could be possible and which components to use for this?