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1. High score urgent need for English translation
Abstract SCM since the 20th century since the advent of the 1970s, with its high cost performance, by the people"s attention and concern, a very wide application, developed very quickly. 51 SCM SCM is the most typical and most representative one. The design of a microcontroller chip and the AT89C51 stepper motor at the core, supplemented by the necessary external circuit, the design The design of a single AT89C51 � � � epiphyseal Dao break Cynoglossus � DC0809 at the core of First Instance, to speed sensor, the odometer counter, thermistor sensors, pressure sensors as the main external components, combined with the necessary external circuit, and the car Instrument Design and Implementation of the instrument system is accurate, reliable and easy to use the advantages of the vehicle instrument on behalf of the latest trends. Keywords Automobile Instrument AT89C51 SCM stepper motor
2. How to say "sky wave communication" in English?
The keyword is "sky wave". There are several options for sky waves (you can choose from according to your major), for reference only: Sky Wave - electromagnetic waves reflected back from the Earths ion layer (estimated to be the "sky wave" you want) Skywave is the propagation of electromagnetic waves bent (refracted) back to the Earth"s surface by the ionosphere. As a result of skywave propagation, a broadcast signal from a distant AM broadcasting station at night, or from a shortwave radio station (or during sporadic e season, a low band TV station) can sometimes be heard as clearly as local stations. (This is distinct from "groundwave" propagation, which is direct from transmitter to radio). Most long-distance HF ra
3. Request an English document on the design of an ultrasonic rangefinder based on a microcontroller (with Chinese translation attached)
This article described the three directions (before, left, right) ultrasonic ranging system is to understand the front of the robot, left and right environment to provide a movement away from the information. (Similar to GPS Positioning System) A principle of ultrasonic distance measurement 1, the principle of piezoelectric ultrasonic generator Piezoelectric ultrasonic generator is the use of piezoelectric crystal resonators to work. Ultrasonic generator, the internal structure as shown in Figure 1, it has two piezoelectric chip and a resonance plate. When it "s two plus pulse signal, the frequency equal to the intrinsic piezoelectric oscillation frequency chip, the chip will happen piez
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