laser distance calculator
This design of possible useful device to estimate distance of object in front of you is inspired by pair of human eyes. But abnormal modus operandi is followed. Here rotation of one laser light is oppositely transmitted to another laser light so that both lasers point to same location (parallel represents infinity). So by changing angle swiftly slowly and steadily we can bring two laser points to same location on surface of object which is your target. We need some mechanical watch kind of gearing system to rotate both lasers in opposite sense and there should be a digital display of value of distance as per our simple trigonometric relation.

Thought - Display can be updated on instant to instant basis because anyway we know that two laser points are always pointing at some location. That location may not be of your interest. So whenever angle is set so that you have pointed both laser dots on same location on the surface of object of your interest, you will get your reading. Otherwise the moment even a slight angle is turned by lasers it starts giving distance of some point in space.
Now I want people to think about a way to set one tiny sensor which may report that yes two dots are falling in place then I can tell you the way to keep rotating lasers to get the distance data of immediate surrounding objects. Because I know the same concept is going to help the machine develop a sense of existence of surrounding objects. So that it may one day learn to live with us.