The principle of PWM signals adjusting LED bright was analyzed, and the controlling circuit of MCU was designed.
分析了脉宽调制信号动态调节LED亮度的原理，设计了单片机控制电路；
The method for controlling chrome residues features simple technique, low cost, complete detoxification, high stability and a bright future of application.
本研究确定了该铬渣治理方法工艺简单、成本低、解毒彻底、稳定性强，具有广泛的应用前景。
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