Research And Development Of The Portable Electronic Compass

The electronics compass can use to measure the change of the existence, strength anddirection of the magnetic field, it has great use. When integrate with GPS system, can alsomaintain definite direction in the die area at short time; The electronics compass outputand the electronics map system can combine together and make to complete draw ofelectronics route also the bad environment; It can also indirectly make use of ironmagnetism object to cause the variety of magnetic field to examine amount of variety, asthe examination airplane, train, car of existence and vehicle of drive a direction etc.According to the characteristics of electronics compass with extensively applied, thisdesign will develop a kind of the portable electronic compass.This design of the portable electronic compass adopt magnetic resistance sensor withlow cost, high resolution and low noice,make it have the characteristic of high resolutionand high accuracy. The electric circuit adoption of the signal processing gathers to enlarge,filter wave and A/D convert unit at16bit Σ-△A/D conversion AD7705, lowered cost andsystem complexity and contracted a physical volume, raised anti-interference ability,carried out a high accuracy data to collect. The microprocessor chooses to use16bitLing Yang machine, complete electric circuit control and data to handle mission, pass thevariety quantity of two-dimensional weight and level direction azimuth angle of themagnetic field variety of the LCD manifestation and carry out then develop of the holdtype electronics compass.This the portable electronic compass. can detect±2×10^-4T magnetic field variety inthe scope. Have a physical volume small, the weight be light, the price be low andconsume electricity province, high accuracy, plug-and-play with can transplant thecharacteristics in other systems, be applicable to magnetic field size and direction tomeasure situation.