Chapter 3. Operation; Introduction; Configuring The Humidity Sensor Pictail™ Demo Board; Using The Humidity Sensor Pc Program - Microchip Technology Humidity Sensor PICtail User Manual

3.1

INTRODUCTION

This demonstration board makes it easy to explore the operation of a humidity sensor
application. Items discussed in this chapter include:
• Configuring the Humidity Sensor PICtail™ Demo Board

• Using the Humidity Sensor PC Program

• Programming the PIC16F690
• Humidity Sensor Calibration
3.2 CONFIGURING THE HUMIDITY SENSOR PICTAIL™ DEMO BOARD
1. Setup the board as explained in Chapter 2. "Setup and Installation".
2. Place a humidity sensor or capacitor in the C
3. Connect the shunt to jumpers JP1 – JP3 according to the measurement
4. Allow sufficient time for the humidity sensor to respond to changes in the
TABLE 3-1:
Jumper
Selected
JP1
JP2
JP3
3.3 USING THE HUMIDITY SENSOR PC PROGRAM
The capacitance.exe PC Program Graphical User Interface (GUI) is displayed in
Figure 3-1. It is a simple program that helps the user to control the functionality of the
Humidity Sensor PICtail™ Demo Board and to view the results sent back from that
board.
Note:
© 2005 Microchip Technology Inc.
HUMIDITY SENSOR PICTAIL™
DEMO BOARD USER'S GUIDE

Chapter 3. Operation

a) Humirel's HS1101LF capacitive humidity sensor.
b) A capacitor of known value.
resolution and capacitance values desired; see Table 3-1.
environment (about 30 seconds for the HS1101LF).
JUMPER SELECTION – MODIFIED CIRCUIT
Measurement
Resolution
(pF / count)
0.1
1
10
This program is intended as an evaluation tool; it does not check for all
possible errors. It is the user's responsibility to make sure the GUI and
demo board are used under reasonable conditions.
socket.
SEN
R
INT
C Range
SEN
(Ω)
0.6 pF to 6.5 nF 6.65 M
6 pF to 65 nF 665 k
60 pF to 650 nF 66.5 k
Comments
Use for HS1101LF sensor
DS51594A-page 13