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These devices have key drawbacks. Water level indicators require manual pump operation and often waste power as multiple LEDs ...

Build a light-activated switch using LDR that lets you control home appliances using your mobile phone's torch.

Organic LEDs are light emitting diodes (LEDs) that use polymers or small organic molecules as their optically active element. Development of organic LEDs is driven in particular by its potential ...

（1）进行液位监测与控制的整体研究与设计。 （2）利用投入式液位传感器测量液面高度。 （3）通过采集液面高度的数据，准确的判断当前值是否在设定范围之间，如果大于设定最大值，则水泵开始工作，直到液面高度值达到最大值时，水泵停止工作。如果 ...

Department of Materials Science and Engineering and Centre for Functional Photonics (CFP), City University of Hong Kong, 83 Tat Chee Avenue, Hong Kong S.A.R. 999077, People’s Republic of China ...