Hi,
I've been looking into making a speed trap for an RC car to drive through 2 points, capture the time taken then calculate the speed it travelled. So far, I've been using 2 IR reflectance sensors, but the Only flaw to this is you have to be within 30cm of it, or it don't pick it up, so I'm looking for something better and a better range.
My second idea is to use 2 ultrasonic range finders, set a barrier on the opposite side and wait for a
Change in the distance (meaning an object has passed) but I'm not sure how effective this is untill I try it tomorrow, and see if there's a certain speed that won't trigger it.
I'm looking for a backup plan. What can I use laser like beam to capture when it's been broken, which is reasonable in price and will work with ms of being broken.
Thanks