Presentation is loading. Please wait.

Presentation is loading. Please wait.

Projekt ISSNB Nis, September 2007- 1 - DAAD Deutscher Akademischer Austausch Dienst German Academic Exchange Service MICROPROCESSOR SYSTEM FOR MEASURING.

Similar presentations


Presentation on theme: "Projekt ISSNB Nis, September 2007- 1 - DAAD Deutscher Akademischer Austausch Dienst German Academic Exchange Service MICROPROCESSOR SYSTEM FOR MEASURING."— Presentation transcript:

1 Projekt ISSNB Nis, September DAAD Deutscher Akademischer Austausch Dienst German Academic Exchange Service MICROPROCESSOR SYSTEM FOR MEASURING NON-ELECTRICAL QUANTITIES Zivko Kokolanski, Cvetan Gavrovski

2 Projekt ISSNB Nis, September DAAD Deutscher Akademischer Austausch Dienst German 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

3 Projekt ISSNB Nis, September DAAD Deutscher Akademischer Austausch Dienst German Academic Exchange Service STRUCTURE OF THE MEASURING SYSTEM Processing Module Power Supply Display and Communication Analog Signal Processing

4 Projekt ISSNB Nis, September DAAD Deutscher Akademischer Austausch Dienst German 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

5 Projekt ISSNB Nis, September DAAD Deutscher Akademischer Austausch Dienst German Academic Exchange Service TEMPERATURE MEASUREMENT Thermistor KTY to 150 o C non linear y = 0,0167x 2 + 7,0979x + 827,6

6 Projekt ISSNB Nis, September DAAD Deutscher Akademischer Austausch Dienst German Academic Exchange Service HUMIDITY MEASUREMENT Sensor 808H5V6 capacitive type 0-100% RH

7 Projekt ISSNB Nis, September DAAD Deutscher Akademischer Austausch Dienst German Academic Exchange Service PRESSURE MEASUREMENT Pressure sensor STS030A measuring strips based hPa 150 mV output voltage

8 Projekt ISSNB Nis, September DAAD Deutscher Akademischer Austausch Dienst German Academic Exchange Service PROCESSING MODULE FE FD FC FF sync illuminance sync temperature sync humidity sync pressure Microcontroller PIC 16F877 4 bidirectional ports 8 channel 10 bit A/D converter

9 Projekt ISSNB Nis, September DAAD Deutscher Akademischer Austausch Dienst German 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

10 Projekt ISSNB Nis, September DAAD Deutscher Akademischer Austausch Dienst German Academic Exchange Service TECHNICALL CHARACTERISTICS MeasurementMeasuring rangeResolutionAccuracy Illuminance Lx10 Lx± 10 % Temperature o C1 o C± 2 % Humidity0-100 %1 %± 4 % Pressure hPa2 hPa± 2 %

11 Projekt ISSNB Nis, September DAAD Deutscher Akademischer Austausch Dienst German 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

12 Projekt ISSNB Nis, September DAAD Deutscher Akademischer Austausch Dienst German Academic Exchange Service THANK YOU!


Download ppt "Projekt ISSNB Nis, September 2007- 1 - DAAD Deutscher Akademischer Austausch Dienst German Academic Exchange Service MICROPROCESSOR SYSTEM FOR MEASURING."

Similar presentations


Ads by Google