Design of Automatic Resistance Tester Based on MC9S12DG128

MC9S12DG128 microcontroller as the core, designed a simple automatic resistance tester. Measuring range is 100Ω, 1KΩ, 10KΩ, 10MΩ four gears, accuracy ± (1% reading +2 word); From big to small scanning way, performing the basic measurement and automatic switching function, At the same time, automatically display a decimal point and unit. Key input module to complete the setup by screening resistance and errors, the microcontroller output PWM control servo rotation speed, in order to achieve different potentiometer speed control; Curve display module real-time displays the measured data, and the rotation angle of the potentiometer is displayed in graph form. Using the powerful function of LCD, display Chinese characters, to increase readability, improve the usability of tester. The system is cost-effective, high reliability, has a good application prospect.

A complementary metric to define a buffer zone in brazilian airports

The legislation on aircraft noise in Brazil recognizes the DNL metric as the only tool to perform noise airport zoning. This paper examines the importance of adopting an auxiliary metric to characterize the impacts of aircraft noise at a specific building sensitive to noise, especially in analysis of speech interference and sleep disturbance. A complementary measure, LAeq, associated with the Brazilian standard for controlling noise pollution, NBR 10151 (Assessment of noise in inhabited areas, for Community comfort), was used in this work. A control curve based the LAeq and on the standart was created and the buffer area between the control curve and DNL 65dB (A) was the object of study of this work. The results showed a high number of people who are affected by aircraft noise and are despised by the public authorities, only at Congonhas airport this number reaches the mark of 596,808 people. The adoption of complementary metric is intended to assist decision makers in identifying people highly annoyed by aircraft noise, allowing the creation of mitigation measures in the affected areas.