ledspeedometer by ben ho-sing poon from china

LEDspeedometer -

This is a simple device for installation to wheels of car, bicycle, and any rotating discs for displaying the corresponding speed of rotation.

This application does play an important role for activities or control in displaying moving speed, such as racing competition, road speed check, and alerting other users in the high moving speed bodies.

The displaying of speed information include the speed in kilometer per hour, and in colors for different range of speed (km/h) as follows: 0-20:Blue; 21-40:Green; 41-60:Red; 61-80:Orange; 81-100: Yellow; >101:White.

Application on wheels of motor vehicle for speed indication. Application on sports activities for judging & a easy way of record of performance & indicator for training as well.