[雙語翻譯]單片機(jī)外文翻譯--基于單片機(jī)的低成本便攜式濕度計(jì)的設(shè)計(jì)與開發(fā)

1、2400 英文單詞， 英文單詞，12800 英文字符，中文 英文字符，中文 3900 字文獻(xiàn)出處： 文獻(xiàn)出處：Martuza, Kazi Golam, et al. “Design and Development of Low Cost and Portable Microcontroller Based Hygrometer.“ IOSR Journal of Electrical and Electronics Engineerin

2、g (IOSR-JEEE)10.3 (2015): 50-56.Design and Development of Low Cost and Portable Microcontroller Based HygrometerKazi Golam Martuza, Humayun Kabir, Farhana Hafiz, Fahmida Akter, Mahbubul Hoq, Mahedee Hasan, Md. Abdul Mann

3、an ChowdhuryAbstractThe hygrometer is widely used in air conditioner, humidity data logger, humidifier & dehumidifier etc. The aim of this research work is to design and development of a low cost, portable microcontr

4、oller based hygrometer. The hygrometer has been designed using the sensor module HSM-20G. The sensor operates in capacitive principle, i.e. changes in relative humidity (RH) of the surrounding air cause a change in diele

5、ctric constant of the polymer film leading to a change of sensor capacitance. The module converts this capacitance change into analog voltage. The HSM-20G sensor provides analog voltage for both temperature and humidity.

6、 The sensor is connected with PIC16F876A microcontroller, which converts the analog voltage into digital and display the result into 16 X 2 alphanumeric LCD display. The program is written in C language using mikro C PRO

7、. The measuring accuracy of the humidity reading of our designed meter is negligible.Keywords: Hygrometer, microcontroller, relative humidity, sensor capacitance, LCD display, and C program.I. IntroductionHygrometry is t

8、he part of physics, which deals with the measurement of the amount of water vapour present in a given volume of air. Condensation of this aqueous vapour present in the atmosphere is responsible for various phenomena like

9、 formation of clouds, fogs, rains, snows, hails, etc [1]. The capacity of air to hold water vapour is limited and is controlled by temperature only. If the air in any place and time contains the maximum amount of water v

10、apour that it can hold, it is said to be saturated, otherwise it is unsaturated [2]. Dew point is the temperature at which water vapour actually present in the air just reaches saturation. We may, therefore, define dew p

11、oint as that temperature at which the pressure of water vapour actually present in the atmosphere is equal to the saturation pressure of water vapour corresponding to dew point. Knowledge of dew point enables us to find

12、out the pressure of water vapour actually present in the atmosphere. For example, dew point today is 20 at a particular place at the time of observation. From Regnault?s chart, it is found that the saturation pressure of

13、 water vapour at 20 0C is 17 mm. Hence today at the particular place, the pressure of water vapour actually present in the atmosphere is 17 mm [3].The term ?humidity? signifies the dampness or wetness of the atmosphere d

14、ue to its holding of water vapour. It is the concentration of water vapor in the air. The concentration can be expressed as absolute humidity, specific humidity, or relative humidity [4]. Relative humidity (R.H.) or hygr

15、ometric state of air is defined to be the ratio of the quantity of water vapour actually present in a certain volume of air at a particular temperature to the quantity of water vapour that would be required to saturate t

16、he same volume of air at the same temperature [5]. So R.H.=Mass of water vapour actually presentin any volumeof air at ?℃𝑀𝑎𝑠𝑠 𝑜𝑓 𝑤𝑎𝑡𝑒⻖

17、3; 𝑣𝑎𝑝𝑜𝑢𝑟 𝑛𝑒𝑐𝑒𝑠𝑠𝑎𝑟𝑦 𝑡𝑜 𝑠𝑎𝑡𝑢𝑟𝑎⻖

18、5;𝑒𝑡?𝑒𝑠𝑎𝑚𝑒 𝑣𝑜𝑙𝑢𝑚𝑒𝑜𝑓 𝑎𝑖𝑟 𝑎𝑡?℃on/off button is pressed once ag

19、ain. The device will need a battery 0f 9V but the voltage regulators will regulate the voltage to 5V for device usage. In order to load the program in the microcontroller used which is PIC16F876A, MPLAB was used for this

20、 Portable humidity Reader. This software will load all program made into internal memory of PIC16F876A. Once the HEX file was created in the MPLAB, this file will then be loaded into PIC16F876A using PIC Kit2. To ensure

21、the sensor works in the specified range, detailed programming must be taken into consideration since the sensor is sensitive towards vapor produced by exhalation or water heater. The programming is modified so that the L

22、CD display the reading will continuously measure by Humidity sensor. There are many reasons for choosing HSM-20G as our humidity sensor. In this circuit designed, a diode (IN4007) is use to protect the circuit from wrong

23、 polarity supply. Few capacitors is used to stabilizes the voltage at the output side of the voltage supply from the 9V battery. The LED is a green LED from over current which might burn LED. MCLR, RB6 and RB7 need to be

24、 connected to the USB in circuit programmer to program the PIC microcontroller. At the same time, RB3 need to be pull down to 0V to disable low voltage programming, because the programmer is using high voltage programmin

25、g. The PIC16F876A will gather all analogue data senses by the humidity sensor and converted into digital output and shows through thee LCD. The process is infinity loop operation as according to the programming loaded ea

26、rlier into the PIC microcontroller [8].Fig. 1: Simplified block diagram of the developed system.III. Design and Circuit Description3.1 HSM-20G Humidity Sensor ModuleThe module of HSM-20G is essential for those applicatio

27、ns where the relative humidity can be converted to standard voltage output. Humidity sensor is device consisting of special plastic material whose characteristics change according to the amount of humidity in air. Basica

28、lly, this sensor senses the amount of water vapor in air. For this research work, analogue input sensor we used. HSM-20G is essential for the objectives and applications where the reading in terms of relative humidity wa

29、s converted into standard voltage output. The applications include humidifiers and dehumidifiers, air conditioner, humidity data loggers and automotive climate control [9, 10]. Table-2 shows the specification of the HSM