This project comes from a recent need for a speed warning sign at a country show..
basically i wanted to measure the speed of a car as it goes along a track, and show a message on an led board in a smiley face or unsmiley face, indicating their speed on the led board..
problem is i dont know how to measure the car speed accurately and cheaply.. i thought about two tubes with pressure sensors, when the car runs the tubes over it triggers the processor, which calculates the speed and bosh. shows it..
but there must be an easier way? as the distance between the tubes would have to be defined distance apart..
all thoughts much appreciated. thanks
basically i wanted to measure the speed of a car as it goes along a track, and show a message on an led board in a smiley face or unsmiley face, indicating their speed on the led board..
problem is i dont know how to measure the car speed accurately and cheaply.. i thought about two tubes with pressure sensors, when the car runs the tubes over it triggers the processor, which calculates the speed and bosh. shows it..
but there must be an easier way? as the distance between the tubes would have to be defined distance apart..
all thoughts much appreciated. thanks