| 摘要 |
A simple talking speedometer for motor vehicles. The speedometer includes at least two layers, one for display speed marks, the other for a panel of light sensors positioned similarly as the speed marks. A speed pointer capable of blocking light or emitting light rotates when there is speed, and the rotating of the speed pointer to a speed mark triggers a corresponding light sensor to send a signal for a corresponding voice message be picked by a computer microchip and spoken by a speaker.
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