基于磁阻芯片和MSP430单片机的电子罗盘设计

Design of digital compass with magneto resistive chip and the MCU of MSP430

摘要:

电子罗盘是一种获取载体姿态航向的设备。介绍磁电子罗盘的工作原理及其具体实现，利用Honeywell的HMC1022双轴磁阻传感器设计了一种小型化的电子罗盘，利用AD623高精密度放大器作信道调理电路，利用低功耗的MSP430微处理器完成A/D转换、方位角计算以及数字化输出等工作。采用置位/复位电路配合微处理器有效解决了传感器失调和漂移的影响。实验表明该系统具有良好的获取航向能力，且运行稳定，功耗低，误差小于1°。

Abstract:

Digital Compass is a kind of device which can acquire the carrier’s attitude. This study introduced the principle of an electronic compass. By using magneto resistive sensor chip HMC1022 made by Honeywell，a 2-axis electronic compass was developed. The amplifier AD623 was used as the signal conditioning circuit. The MPU MSP430 was in charge of A/D converting, azimuth computing and digital outputting. And the Set/Reset(S/R) circuit was adopted so that the error due to null and drift could be minimized. Experiment results showed that the system had good ability to acquire the carrier’s attitude with stable operation and low power consumption. The error was below 1°.