I'm going to construct a speed sensor and this is my idea. I'm going to use two lasers. The distance(d) between the two lasers will be a constant. I'm going to extract the time(t) it took for the object to go from laser A to laser B. Then I'll put them in the formula: Speed = d/t. The answer to the equation will then be displayed on an LCD or seven segment display. Does this sound viable? Any tips? What do you think?