Test your reaction times using a digital multimeter

So you think your reaction time is pretty good. Well, you might be surprised. This little project will let you test your own or anyone’s reaction time and read it out accurately on a digital multimeter. The ‘Brake!’ stimulus is a large red LED, while the subject’s response can be sensed via a pushbutton, footpedal switch or even an optical detector, set up to sense the light from a car’s brake lamp.