SU Yan-ping, GONG Mao-fa, AN Bin, ZHANG Jian-yu, ZHAO Xu-jie
(College of Electrical Engineering and Automation, Shandong University of Science and Technology, Qingdao 266590，China)
Abstract： The titl angle measurement system based on the ADXL345 of three-axis acceleration sensor is introduced, and the composition and working principle of the system are described. The MSP430F149 microcontroller of ultra-low power and high performance is adopted. Firstly, the voltage value which is proportional to the acceleration value is output by ADXL345 when the system is powered. Secondly, the voltage value is converted into the corresponding digital signal by AD converter of the sensor. Thirdly, the digital signal is transformed into the titl angle according to the arithmetic processing of the MSP430F149. Finally, the corresponding angle is displayed on the liquid crystal display (LCD) screen. Experimental results show that the design has high sensitivity and response speed compared with the conventional methods. It is suitable for practical engineering application because of simple structure, low cost and low power consumption.
Key words： ADXL345; MSP430F149; tilt angle measurement; liquid crystal display (LCD)
CLD number： TH745.2 Document code： A
Article ID： 1674-8042(2014)02-0019-04 doi： 10.3969/j.issn.1674-8042.2014.02.003
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基于传感器ADXL345倾角测量仪的设计
苏彦平, 公茂法, 安彬, 张建玉, 赵旭杰
(山东科技大学 电气与自动化工程学院， 山东 青岛 266590)
摘要:设计了一种基于ADXL345三轴加速度传感器的倾角测量系统。 阐述了系统的组成及工作原理， 其控制芯片采用超低功耗、 高性能单片机MSP430F149。 系统通电后， ADXL345输出一个与加速度成正比的电压值， 该电压值经传感器内部AD转换器转换成相应的数字信号， 而数字信号经MSP430F149处理运算， 可转化成倾角值显示在LCD显示屏上。 实验表明： 与传统的倾角仪相比， 该系统结构简单、 成本低、 功耗小， 使用方便， 具有较高的灵敏度和响应速度， 可满足实际工程应用要求。
关键词:ADXL345； MSP430F149； 倾角测量； LCD显示
引用格式：SU Yan-ping, GONG Mao-fa, AN Bin, et al. Design of a titl angle measurement system based on ADXL345 sensor. Journal of Measurement Science and Instrumentation, 2014, 5(2): 19-22. [doi: 10.3969/j.issn.1674-8042.2014.02.003]
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