1. PICNIC Demo Module 1 IP-based Psychrometer 陳育瑋、方煒 台大生機系

2. Objective Development of a demo module 1.providing calculation of psychrometric properties (thermodynamic properties of moist air) based on dry bulb temperature and relative humidity data measured. 2.teaching usage of PICNIC. 3.teaching VB programming.

3. Software Written in Visual Basic v6 (Microsoft, USA) Required PICOCX.ocx (Active X 控制項 )

4. Device

5. Wiring Two options for connection PC to Hub then to PICNIC: network cable PC to PICNIC: connecting cable 1White-greenWhite-orange1 2GreenOrange2 3White-orangeWhite-green3 4Blue 4 5White-blue 5 6OrangeGreen6 7White-brown 7 8Brown 8

6. Network cable Connecting cable

7. RHU300M T/RH Sensor

8. Air Inlet and sensing part of the sensor

9. Air outlet and Fan

10. 5 V output (red and black wire from sensor) Analog and digital I/O RA0: Temperature (yellow wire) RA1: Relative Humidity (green wire)

11. Terminal connection of RHU-300 TerminalContent 1Power source 5 VDC 2Humidity Output (0~3 VDC) 3GND 4 Temperature Output 50 k  @25 o C

12. Your computer’s IP Your PICNIC’s IP

13. Your computer and PICNIC must be in the same domain (the first 3 numbers should be the same) when PICNIC is directly connect to the local PC. PICNIC’s default IP: 192.168.0.200

14. Default IP Default Gate Way Port for Internet connection Port for direct connection to PC

17. RHU-300M (5 Volt range)???

18. Sensor: thermistor 503 Y X 10 k  resistor was used

19. T = f(V) (10 k  resistor was used)

20. Sensor: thermistor 503 4.7 k  resistor was used

21. T=f(V) (4.7 k  resistor was used)

22. RH (3 Volt range)

24. Thermodynamic properties derived based on given atmospheric pressure, dry bulb temperature and relative humidity Ver.1, 2007/7/27 A bug

25. A PsyChart software previously developed

26. This is the VPD

27. This is the VPD’

28. Ver.2, 2007/8/2 PICNIC is connected to an actual IP in the internal. In the same domain with your PC IS NOT required. 140.94.2.2

29. Ver.2, 2007/8/2 Press Start icon to read T and RH sensor data and saved to a default mdb file. 140.94.2.2

30. Ver.2, 2007/8/2 Press Stop icon to terminate sensor data reading, and export saved data to an excel xls file, with the default file name, as shown in the next page. 140.94.2.2

31. Ver.2, 2007/8/2 Lack of date and time information.