| 摘要 |
<p>A lighting system comprising a lamp comprising an array of LEDs arranged to transform electricity into a light beam having properties such as intensity, colour, colour temperature; a light control means comprising a LED driver and a pulse width modulator arranged to adjust said light beam properties; a DA-converter, an ultrasound driver and an ultrasonic transmitter arranged to convert a digital transmit signal into the transmission of an ultrasonic pulse; an ultrasonic receiver and an amplifier arranged to receive reflected ultrasonic signals and transform said ultrasonic signal in a voltage, and a comparator arranged to generate a digital receive signal if said voltage is greater than a predetermined treshold; a processing means arranged to derive a time-of -flight signal representing the time differences between said digital transmit and receive signals and to send control signals to said light control means in dependence of said time-of- flight signal, wherein said processing means, said pulse width modulator, said DA-converter and said comparator are integrated in a single microcontroller chip.</p> |
