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Vol. 135, Issue 12, December 2011, pp.126-133




Design and Development of a Relative Humidity and Room Temperature Measurement System with On Line Data Logging Feature for Monitoring the Fermentation Room of Tea Factory



Department of Instrumentation and USIC, Gauhati University, Guwahati-781014, Assam, India

Tel.: +91-361-2570560, fax: +91-361-2700311

E-mail: utpalsarma@gauhati.ac.in



Received: 3 September 2011   /Accepted: 16 December 2011   /Published: 28 December 2011

Handbook of Laboaratory Measurements book


Abstract: The design and development of a Relative Humidity (RH) and Room Temperature (RT) monitoring system with on line data logging feature for monitoring fermentation room of a tea factory is presented in this paper. A capacitive RH sensor with on chip signal conditioner is taken as RH sensor and a temperature to digital converter (TDC) is used for ambient temperature monitoring. An 8051 core microcontroller is the heart of the whole system which reads the digital equivalent of RH data with the help of a 12-bit Analog to Digital (A/D) converter and synchronize TDC to get the ambient temperature. The online data logging is achieved with the help of RS-232C communication. Field performance is also studied by installing it in the fermentation room of a tea factory.


Keywords: Relative humidity, Temperature to digital converter, Fermentation, Microcontroller.


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