Device for determining the speed, distance traversed, elapsed time and calories expended by a person while running

A device for measuring the speed of a person while running along a surface, said device comprising:

• a transducer for sensing when a foot of the runner is in contact with the surface and producing a foot contact signal having a duration proportional to the time the foot is in contact with the surface, said transducer being located in the shoe of the runner;
• a radio frequency transmitter connected to said pressure switch or transducer for transmitting said foot contact signal;
• a radio frequency receiver for receiving said foot contact signal transmitted by said frequency transmitter;
• a microprocessor connected to said radio frequency receiver for calculating, soley from said foot contact signal, an output speed signal representing the speed of the runner;
• and
• a liquid crystal display connected to the output of said microprocessor for displaying the speed of the runner in accordance with said output speed signal.