An adaptive amplifier system for wireless sensor network applications
Journal of Electrical and Computer Engineering
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This paper presents a new design scheme that an electronic protractor includes two swing arms and one variable resistor located on the top of swing arms for measuring angles. The variable resistor connects the liquid crystal display (LCD) screen through an angle-to-voltage (A/V) controlled circuit, an analog-to-digital (A/D) converter, a single chip processor, and a LCD driver. The protractor can change the resistance of the variable resistor simultaneously and display the measuring angle on the LCD screen through the processing of the A/V controlled circuit, the A/D converter, single chip processor, and the LCD driver when the swing arms are open or close to make the angular deviations. The present electronic protractor is claimed on those measuring devices through the above process.