| Summary: | 碩士 === 國立勤益科技大學 === 電子工程系 === 102 === Light-emitting diode (LED) is a special diode, which basically is composed of p-n semiconductor junction and can be used as light source. When the p-n junction is biased as forward voltage, the electron in n-type material will recombined with hole in p-type material. As a result, the energy releasing is in the form of photons to provide light source. Various types of LEDs can emit light source of different colors, depending on what kinds of the composed of different chemical elements or compounds used. The spectrum of LED light is capable of near ultraviolet, visible, and near infrared. LEDs light are with advantages of high efficiency, longer lifetime, robustness and smaller size. Today, LED light is widely used in various applications including of traffic indicator, consumer panel, and general lighting; sometimes, it is called as the new type light source in twenty-one century.
In this work, we use Arduino board as a development platform to realize the LED array controlling system. Arduino is a microcontroller based board and provides an open resource to allow us easily integrated with switches, sensors, step motors and others peripheral interfaces. In this study, the system is composed of 4×4×4 cubic LED color array. Based on pulse-width modulation (PWM) technique, the brightness and colors of sixty-four LEDs is adjustable by using mobile phone via APP program and bluetooth wireless technique. In addition, a PCB integrated all passive elements is achieved. The light flashing patterned, on-off frequency, and light brightness are successfully realized and verified in this work.
|
|---|
