05-05-2011, 02:50 PM
Abstract
In this paper, an effort has been made todesign and developed a 4-channel data logger for indoorenvironment. Initially the present work hasconcentrated to environmental parameter (temperatureand humidity) and more polluted contaminants(concentration level of CO and CO2). The Data logger isproposed to be developed with the use ofmicrocontroller PIC 18F4458 (inbuilt 8 channel ADC),i.e. 4 channels will be used and 4 channel will open inexternal sensor. Real Time Clock is also interfaced forsampled data with the instance of sampling time andmonth/date/year. The sampled data will be stored in theEEPROM which is interfaced to the microcontroller.The data will be stored in the note pad tabular formcorresponding to the Month/Date/Year with the help ofgraphical user interface.
Index Terms—GUI (Graphical User Interface), RTC(Real Time Clock), ADC (Analog Digital Converter).
I. INTRODUCTION
Built environment and architecture are closelyassociated. The built environment affects indoorphysical environments, and subsequently health andquality of life of occupants. There is evidenceshowing the pathways and mechanisms by which thebuilt environment affects health and factor associatedwith specific aspects of physical and mental health.The problem has become acute in recent past becauseof the rapid industrial growth in last half century andhas lead to change in lifestyles (Become moredependent on indoor environment), increased independence on artificial products and advances inmedicines [1]. The main factors of the environmentalcondition are the air quality and environmentalparameter of the inside unconditioned environment.Across the world indoor air quality monitoring isgaining hotspot in present research works becauserecent study has put forth that 30 – 40% of totalnatural resources are exploited by the buildings andalmost 50% of energy resources is used to conditionbuildings in industrialized countries. The majorcontaminants of indoor environment pollutioninclude carbon mono oxide and carbon dioxide. Thereality is that indoor air can be up to 10 times morepolluted than outdoor air [2]. Many researcher arecollect the data for different techniques, in differentfields are facing similar difficulty in data collection.For example, a design engineer needs a system that isable to collect and transfer data from the testinglaboratory to his work place and buildings such asfactories and offices needs to monitor theirenvironmental conditions for fire or smoke detection.The main aim of this paper is to develop low costdata logger. It can be summarized as follows- LCDinterfacing to display the output of various modules,interfacing of real time clock with microcontroller,interfacing of EEPROM with microcontroller,interfacing the data logger to the personal computerby using the serial (RS-232), minimization of powerconsumption in order to enhance battery life andpreparing the user friendly graphical user interface(GUI) in visual language to operate the data logger.Real time assessment of indoor air and environmentparameters has got tremendous energy savingpotential. To focus on this problem we are trying todevelop multi-channel data logger for temperature,relative humidity, CO, and CO2.
II. SENSOR INTERFACING TO THE MICROCONTROLLER
A sensor is a device that measures a physicalquantity and converts it into an equivalent analog ordigital signal which can be read by an observer or byan instrument. Monitoring of a indoor environmentinvolves sensing the changes occurring inside it. Theparameters which are of importance are thetemperature, relative humidity, and concentrationlevel of air pollutant CO and CO2 inside the building[3]. In this paper we have used temperature, relativehumidity, CO, and CO2 sensors.A. Semiconductor Gas SensorsA gas sensor detects particular gas molecules andproduces an electrical signal whose magnitude isproportional to the concentration of the gas [4]. Tilldate, no gas sensor exists that is 100% selective toonly a single gas. A good sensor is sensitive to themeasured quantity but less sensitive to otherquantities. Available gas sensors are based on fivebasic principles. These can be electrochemical,infrared, catalytic bead, photo ionization and solidstate[5, 6]. We have selected these sensors becausethey produce a strong signal for the selected variableespecially at high gas concentrations with adequatesensitivity. They have a fast response time, highstability, long life, low cost, low dependency onhumidity, low power consumption, and compact size[4]. Four sensors along with their signal conditioningcircuit are used to sense the desired parameter
Download full report
http://www.iaengpublication/IMECS2010/IM...93-998.pdf
In this paper, an effort has been made todesign and developed a 4-channel data logger for indoorenvironment. Initially the present work hasconcentrated to environmental parameter (temperatureand humidity) and more polluted contaminants(concentration level of CO and CO2). The Data logger isproposed to be developed with the use ofmicrocontroller PIC 18F4458 (inbuilt 8 channel ADC),i.e. 4 channels will be used and 4 channel will open inexternal sensor. Real Time Clock is also interfaced forsampled data with the instance of sampling time andmonth/date/year. The sampled data will be stored in theEEPROM which is interfaced to the microcontroller.The data will be stored in the note pad tabular formcorresponding to the Month/Date/Year with the help ofgraphical user interface.
Index Terms—GUI (Graphical User Interface), RTC(Real Time Clock), ADC (Analog Digital Converter).
I. INTRODUCTION
Built environment and architecture are closelyassociated. The built environment affects indoorphysical environments, and subsequently health andquality of life of occupants. There is evidenceshowing the pathways and mechanisms by which thebuilt environment affects health and factor associatedwith specific aspects of physical and mental health.The problem has become acute in recent past becauseof the rapid industrial growth in last half century andhas lead to change in lifestyles (Become moredependent on indoor environment), increased independence on artificial products and advances inmedicines [1]. The main factors of the environmentalcondition are the air quality and environmentalparameter of the inside unconditioned environment.Across the world indoor air quality monitoring isgaining hotspot in present research works becauserecent study has put forth that 30 – 40% of totalnatural resources are exploited by the buildings andalmost 50% of energy resources is used to conditionbuildings in industrialized countries. The majorcontaminants of indoor environment pollutioninclude carbon mono oxide and carbon dioxide. Thereality is that indoor air can be up to 10 times morepolluted than outdoor air [2]. Many researcher arecollect the data for different techniques, in differentfields are facing similar difficulty in data collection.For example, a design engineer needs a system that isable to collect and transfer data from the testinglaboratory to his work place and buildings such asfactories and offices needs to monitor theirenvironmental conditions for fire or smoke detection.The main aim of this paper is to develop low costdata logger. It can be summarized as follows- LCDinterfacing to display the output of various modules,interfacing of real time clock with microcontroller,interfacing of EEPROM with microcontroller,interfacing the data logger to the personal computerby using the serial (RS-232), minimization of powerconsumption in order to enhance battery life andpreparing the user friendly graphical user interface(GUI) in visual language to operate the data logger.Real time assessment of indoor air and environmentparameters has got tremendous energy savingpotential. To focus on this problem we are trying todevelop multi-channel data logger for temperature,relative humidity, CO, and CO2.
II. SENSOR INTERFACING TO THE MICROCONTROLLER
A sensor is a device that measures a physicalquantity and converts it into an equivalent analog ordigital signal which can be read by an observer or byan instrument. Monitoring of a indoor environmentinvolves sensing the changes occurring inside it. Theparameters which are of importance are thetemperature, relative humidity, and concentrationlevel of air pollutant CO and CO2 inside the building[3]. In this paper we have used temperature, relativehumidity, CO, and CO2 sensors.A. Semiconductor Gas SensorsA gas sensor detects particular gas molecules andproduces an electrical signal whose magnitude isproportional to the concentration of the gas [4]. Tilldate, no gas sensor exists that is 100% selective toonly a single gas. A good sensor is sensitive to themeasured quantity but less sensitive to otherquantities. Available gas sensors are based on fivebasic principles. These can be electrochemical,infrared, catalytic bead, photo ionization and solidstate[5, 6]. We have selected these sensors becausethey produce a strong signal for the selected variableespecially at high gas concentrations with adequatesensitivity. They have a fast response time, highstability, long life, low cost, low dependency onhumidity, low power consumption, and compact size[4]. Four sensors along with their signal conditioningcircuit are used to sense the desired parameter
Download full report
http://www.iaengpublication/IMECS2010/IM...93-998.pdf