MICROPROCESSOR SYSTEM FOR MEASURING NON-ELECTRICAL QUANTITIES
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Projekt „ISSNB“ Nis, September 2007 - 1 - DAAD Deutscher Akademischer Austausch Dienst German Academic Exchange Service MICROPROCESSOR SYSTEM FOR MEASURING MICROPROCESSOR SYSTEM FOR MEASURING NON-ELECTRICAL QUANTITIES NON-ELECTRICAL QUANTITIES Zivko Kokolanski, Cvetan Gavrovski [email protected] [email protected]
description
MICROPROCESSOR SYSTEM FOR MEASURING NON-ELECTRICAL QUANTITIES. Zivko Kokolanski, Cvetan Gavrovski [email protected] [email protected]. STRUCTURE OF THE MEASURING SYSTEM MEASURING CIRCUITS - LLUMINANCE MEASUREMENT - TEMPERATURE MEASUREMENT - PowerPoint PPT Presentation
Transcript of MICROPROCESSOR SYSTEM FOR MEASURING NON-ELECTRICAL QUANTITIES
Projekt „ISSNB“
Nis, September 2007 - 1 -
DAADDeutscher Akademischer Austausch DienstGerman Academic Exchange Service
MICROPROCESSOR SYSTEM FOR MEASURING MICROPROCESSOR SYSTEM FOR MEASURING NON-ELECTRICAL QUANTITIESNON-ELECTRICAL QUANTITIES
Zivko Kokolanski, Cvetan [email protected]@feit.ukim.edu.mk
Projekt „ISSNB“
Nis, September 2007 - 2 -
DAADDeutscher Akademischer Austausch DienstGerman Academic Exchange Service
OUTLINE
STRUCTURE OF THE MEASURING SYSTEM
MEASURING CIRCUITS
- LLUMINANCE MEASUREMENT
- TEMPERATURE MEASUREMENT
- HUMIDITY MEASUREMENT
- PRESSURE MEASUREMENT
PROCESSING MODULE
MEASURING ALGORITHM
TECHNICALL CHARACTERISTICS
CONCLUTION
Projekt „ISSNB“
Nis, September 2007 - 3 -
DAADDeutscher Akademischer Austausch DienstGerman Academic Exchange Service
STRUCTURE OF THE MEASURING SYSTEM
Processing Module
Power Supply
Display and
Communication
Analog Signal
Processing
Projekt „ISSNB“
Nis, September 2007 - 4 -
DAADDeutscher Akademischer Austausch DienstGerman Academic Exchange Service
ILLUMINANCE MEASUREMENT
Photodiode: BPW34 high sensitivity fast response time visible and near IR (800nm)
Most commonly used detectors: silicon photodiodes photoconductive cells
Advantages of the photodiodes: higher sensitivity faster response time higher stability and linearity
Projekt „ISSNB“
Nis, September 2007 - 5 -
DAADDeutscher Akademischer Austausch DienstGerman Academic Exchange Service
TEMPERATURE MEASUREMENT
Thermistor KTY21-122 -55 to 150oC non linear
y = 0,0167x2 + 7,0979x + 827,6
Projekt „ISSNB“
Nis, September 2007 - 6 -
DAADDeutscher Akademischer Austausch DienstGerman Academic Exchange Service
HUMIDITY MEASUREMENT
Sensor 808H5V6 capacitive type 0-100% RH
Projekt „ISSNB“
Nis, September 2007 - 7 -
DAADDeutscher Akademischer Austausch DienstGerman Academic Exchange Service
PRESSURE MEASUREMENT
Pressure sensor STS030A measuring strips based 0-2000 hPa 150 mV output voltage
Projekt „ISSNB“
Nis, September 2007 - 8 -
DAADDeutscher Akademischer Austausch DienstGerman Academic Exchange Service
PROCESSING MODULE
FE FE FD FD FC FCFFFF
sync illuminance sync temperature sync humidity sync pressure
Microcontroller PIC 16F877 4 bidirectional ports 8 channel 10 bit A/D converter
Projekt „ISSNB“
Nis, September 2007 - 9 -
DAADDeutscher Akademischer Austausch DienstGerman Academic Exchange Service
MEASURING ALGORITHM
PARAMETER SETTING
LCD INITIALISATION
SERIAL INTERFACE INITIALISATION
A/D CONVERSION SETTING
ILLUMINATION MEASUREMENT
TEMPERATURE MEASUREMENT
HUMIDITY MEASUREMENT
PRESSURE MEASUREMENT
A/D CONVERSION (20 SAMPLES)
AVERAGING
CORRECTION
SERIAL TRANSMITION
LCD WRITE
Projekt „ISSNB“
Nis, September 2007 - 10 -
DAADDeutscher Akademischer Austausch DienstGerman Academic Exchange Service
TECHNICALL CHARACTERISTICS
Measurement Measuring range Resolution Accuracy
Illuminance 0-10000 Lx 10 Lx ± 10 %
Temperature -55-150 oC 1 oC ± 2 %
Humidity 0-100 % 1 % ± 4 %
Pressure 0 -2000 hPa 2 hPa ± 2 %
Projekt „ISSNB“
Nis, September 2007 - 11 -
DAADDeutscher Akademischer Austausch DienstGerman Academic Exchange Service
CONCLUTION
The presented paper describes a practical measuring system, which allows measurement, transfer and display of the moment values of four physical quantities: temperature, pressure, humidity and illumination
The measuring system uses a serial RS-232 port for computer communication
Further development of the measuring system is planned in future, in a way of enlarging the measuring quantities with measurements of ionizing radiation and wireless data transmission
Projekt „ISSNB“
Nis, September 2007 - 12 -
DAADDeutscher Akademischer Austausch DienstGerman Academic Exchange Service
THANK YOU!
