1、2400 英文单词， 12800 英文字符 ，中文 3900 字 文献出处： Martuza, Kazi Golam, et al. Design and Development of Low Cost and Portable Microcontroller Based Hygrometer. IOSR Journal of Electrical and Electronics Engineering (IOSR-JEEE)10.3 (2015): 50-56. Design and Development of Low Cost and Portable Microcontroller B
2、ased Hygrometer Kazi Golam Martuza, Humayun Kabir, Farhana Hafiz, Fahmida Akter, Mahbubul Hoq, Mahedee Hasan, Md. Abdul Mannan Chowdhury Abstract The hygrometer is widely used in air conditioner, humidity data logger, humidifier & dehumidifier etc. The aim of this research work is to design and deve
3、lopment of a low cost, portable microcontroller 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 dielectric constant of the polymer film lea
4、ding 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. The sensor is connected with PIC16F876A microcontroller, which converts the analog voltage into digital and display t
5、he result into 16 X 2 alphanumeric LCD display. The program is written in C language using mikro C PRO. 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. Int
6、roduction Hygrometry is the 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 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 vapour that it can hold, it is sa
