6th International Conference on Electronic, Mechanical, Information and Management (EMIM 2016)
Design of Digital Barometer Based on Single-Chip Microcomputer Control
Weisheng Zheng and Yimei Liu
Jiangxi Technical College of Manufacturing, Department of Information Engineering
Keywords: Digital barometer; Single-chip machine; Sensor; Hardware realization method
Abstract. The core component of barometer is the pressure sensor, which plays a very important role in monitoring pressure, controlling pressure changes and measuring other physical quantities. Barometer obtains the air pressure data through changes of air pressure at different heights. According to the meteorological regulations, the weight of air column effecting each unit of area is called air pressure. Digital barometer is widely applied to mining enterprises, electronic products and outdoor operation, and after a long period of development, it is becoming increasingly accurate with more diversified functions, and is gradually developing towards being intelligent and multi-functional. This paper introduces the digital barometer based on single-chip control in details, analyzes the overall structure of barometer and introduces the way to realize both software and hardware of barometer as well as adjust and simulate the digital barometer system to guarantee the reliability and stability of the digital barometer systemrsquo;s functions.
Introduction
Digital barometer has been widely applied in various engineering environment: mining fields, weather station, environmental protection and labs, etc. It is an equipment directly changing the measure air pressure into current or voltage signal that can be easily transmitted and detected using the pressure-sensitive components, and then real-timely display them through the subsequent circuit processing. Its core component is barometer, which plays a vital role in controlling pressure changes, monitoring pressure and measuring physical parameters. Single-chip machine has some advantages, such as convenient, simple and flexible controlling.
At present, barometer with single pressure-measuring function has default setting value that cannot be adjusted or revised, so it is not convenient to use them. This paper has made improvement to design in various aspects to develop a multi-functional digital barometer, which can modify the set value if necessary and input it to the system with huge range of work temperature and measured air pressure as well as high accuracy, stability and strong ability to anti-interference. Its multi-display function can allow users to intuitively monitor the current status of each signal (such as showing temperature, supply voltage and pressure voltage, etc.). The serial communication port of the system can transmit the measured data to the computer for various processing and make the barometer intelligent, bringing great convenience to users.
Hardware Realization of Digital Barometer
Various factors need to be taken into consideration in constructing hardware of digital barometer, such as its stability, complexity, manufacturing costs and maintenance costs, etc. This chapter introduces the composition of digital barometersrsquo; hardware equipment to establish a set of stable and systematic hardware equipment.
Air Pressure Sensor. Air pressure sensor exists at the core position of the entire air pressure structure and to choose an appropriate air pressure sensor, various factors need to be taken into consideration: measuring accuracy, measuring range, temperature changes, and absolute air pressure value, etc. Digital barometer is to measure the absolute air pressure value, so it is necessary to have air pressure sensor that can measure the absolute air pressure value. In order to simplify the circuit design and improve barometerrsquo;s stability and anti-interference capacity, barometer also needs to have temperature compensation. According to the above requirements, choose the
copy; 2016. The authors - Published by Atlantis Press 43
MAX41000A type of Motorda barometer in this digital air pressure sensor. Temperature compensation range of this air pressure sensor is -40~125℃, and the pressure-bearing range is 20~1050kPa. The air pressure sensor has good linearity within this pressure range and the range of voltage output signal is 0.3~4.65V. Air pressure sensor can be used to measure the absolute air pressure, and its specific output relationship is as follows:
Vout Vs 0.01059P 0.1528 Error
In the formula, Vs is the work voltage, P is the air pressure value, and V is the output voltage.
V/F Transformation. Air pressure sensor measures the current and voltage signal of the measured air pressure, but it cannot be recognized by single chip machine, so V/F component needs to transfer the input voltage value into pulse string that can be recognized by single chip machine. Although the V/F component itself is not a quantizer, the existence of timer and counter can realize the conversion of A/D to convert the simulated voltage signal into pulse string with strong anti-interference ability, capable of realizing distance transmission and being input into computer.
LM331 can use the single and double power supply and allowed range of voltage is 5~40V and the maximum non-linear error is 0.001%. The LM331 pressure frequency conversion relationship is:
f0 KVi
Herein, K R 0 /2.09RiC i R L ,Rs Rs<sub
剩余内容已隐藏，支付完成后下载完整资料</sub
6th International Conference on Electronic, Mechanical, Information and Management (EMIM 2016)
Design of Digital Barometer Based on Single-Chip Microcomputer Control
Weisheng Zheng and Yimei Liu
Jiangxi Technical College of Manufacturing, Department of Information Engineering
Keywords: Digital barometer; Single-chip machine; Sensor; Hardware realization method
Abstract. The core component of barometer is the pressure sensor, which plays a very important role in monitoring pressure, controlling pressure changes and measuring other physical quantities. Barometer obtains the air pressure data through changes of air pressure at different heights. According to the meteorological regulations, the weight of air column effecting each unit of area is called air pressure. Digital barometer is widely applied to mining enterprises, electronic products and outdoor operation, and after a long period of development, it is becoming increasingly accurate with more diversified functions, and is gradually developing towards being intelligent and multi-functional. This paper introduces the digital barometer based on single-chip control in details, analyzes the overall structure of barometer and introduces the way to realize both software and hardware of barometer as well as adjust and simulate the digital barometer system to guarantee the reliability and stability of the digital barometer systemrsquo;s functions.
Introduction
Digital barometer has been widely applied in various engineering environment: mining fields, weather station, environmental protection and labs, etc. It is an equipment directly changing the measure air pressure into current or voltage signal that can be easily transmitted and detected using the pressure-sensitive components, and then real-timely display them through the subsequent circuit processing. Its core component is barometer, which plays a vital role in controlling pressure changes, monitoring pressure and measuring physical parameters. Single-chip machine has some advantages, such as convenient, simple and flexible controlling.
At present, barometer with single pressure-measuring function has default setting value that cannot be adjusted or revised, so it is not convenient to use them. This paper has made improvement to design in various aspects to develop a multi-functional digital barometer, which can modify the set value if necessary and input it to the system with huge range of work temperature and measured air pressure as well as high accuracy, stability and strong ability to anti-interference. Its multi-display function can allow users to intuitively monitor the current status of each signal (such as showing temperature, supply voltage and pressure voltage, etc.). The serial communication port of the system can transmit the measured data to the computer for various processing and make the barometer intelligent, bringing great convenience to users.
Hardware Realization of Digital Barometer
Various factors need to be taken into consideration in constructing hardware of digital barometer, such as its stability, complexity, manufacturing costs and maintenance costs, etc. This chapter introduces the composition of digital barometersrsquo; hardware equipment to establish a set of stable and systematic hardware equipment.
Air Pressure Sensor. Air pressure sensor exists at the core position of the entire air pressure structure and to choose an appropriate air pressure sensor, various factors need to be taken into consideration: measuring accuracy, measuring range, temperature changes, and absolute air pressure value, etc. Digital barometer is to measure the absolute air pressure value, so it is necessary to have air pressure sensor that can measure the absolute air pressure value. In order to simplify the circuit design and improve barometerrsquo;s stability and anti-interference capacity, barometer also needs to have temperature compensation. According to the above requirements, choose the
copy; 2016. The authors - Published by Atlantis Press 43
MAX41000A type of Motorda barometer in this digital air pressure sensor. Temperature compensation range of this air pressure sensor is -40~125℃, and the pressure-bearing range is 20~1050kPa. The air pressure sensor has good linearity within this pressure range and the range of voltage output signal is 0.3~4.65V. Air pressure sensor can be used to measure the absolute air pressure, and its specific output relationship is as follows:
Vout Vs 0.01059P 0.1528 Error
In the formula, Vs is the work voltage, P is the air pressure value, and V is the output voltage.
V/F Transformation. Air pressure sensor measures the current and voltage signal of the measured air pressure, but it cannot be recognized by single chip machine, so V/F component needs to transfer the input voltage value into pulse string that can be recognized by single chip machine. Although the V/F component itself is not a quantizer, the existence of timer and counter can realize the conversion of A/D to convert the simulated voltage signal into pulse string with strong anti-interference ability, capable of realizing distance transmission and being input into computer.
LM331 can use the single and double power supply and allowed range of voltage is 5~40V and the maximum non-linear error is 0.001%. The LM331 pressure frequency conversion relationship is:
f0 KVi
Herein, K R 0 /2.09RiC i R L ,Rs Rs<sub
剩余内容已隐藏，支付完成后下载完整资料</sub
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