Microchip Technology Humidity Sensor PICtail Bedienungsanleitung

Humidity Sensor

PICtail™ Demo Board

User’s Guide

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HUMIDITY SENSOR PICTAIL™

DEMO BOARD USER’S GUIDE

Table of Contents

Preface ........................................................................................................................... 1

Introduction............................................................................................................ 1

Document Layout .................................................................................................. 1

Conventions Used in this Guide ............................................................................ 2

Recommended Reading........................................................................................ 3

The Microchip Web Site ........................................................................................ 4

Customer Support ................................................................................................. 4

Document Revision History ................................................................................... 4

Chapter 1. Product Overview

1.1 Introduction ..................................................................................................... 5

1.2 Kit Contents .................................................................................................... 5

1.3 Humidity Sensor PICtail™ Demo Board ......................................................... 5

1.4 Associated Tools ............................................................................................ 7

1.5 Assembly Code Modules ................................................................................ 8

Chapter 2. Setup and Installation

2.1 Introduction ..................................................................................................... 9

2.2 Required Tools ............................................................................................... 9

2.3 Setting up the Humidity Sensor PICtail™ Demo Board ................................. 9

2.4 Connecting to Alternate Tools ...................................................................... 11

Chapter 3. Operation

3.1 Introduction ................................................................................................... 13

3.2 Configuring the Humidity Sensor PICtail™ Demo Board ............................. 13

3.3 Using the Humidity Sensor PC Program ...................................................... 13

3.4 Humidity Sensor Calibration ......................................................................... 15

Chapter 4. Modified Circuit

4.1 Introduction ................................................................................................... 17

4.2 The “Reduced Current” Circuit ..................................................................... 17

Humidity Sensor PICtail™ Demo Board User’s Guide

Appendix A. Schematic and Layouts

A.1 Introduction .................................................................................................. 19

A.2 Highlights ..................................................................................................... 19

A.3 Demonstration Board Description ................................................................ 19

A.4 The “Reduced Current” Modification ............................................................ 20

A.5 Additional Comments ................................................................................... 20

Appendix B. Bill Of Materials (BOM)

B.1 Humidity Sensor PICtail™ Demo Board BOM ............................................. 25

B.2 BOM for Humidity Sensor and Other Capacitors in Box .............................. 26

B.3 BOM for “Reduced Current” Modifications ................................................... 26

Worldwide Sales and Service .....................................................................................28

HUMIDITY SENSOR PICTAIL™

DEMO BOARD USER’S GUIDE

Preface

INTRODUCTION

This chapter contains general information that will be useful to know before using the

Humidity Sensor PICtail™ Demo Board. Items discussed in this chapter include:

• Document Layout

• Conventions Used in this Guide

• Recommended Reading

• The Microchip Web Site

• Customer Support

• Document Revision History

DOCUMENT LAYOUT

This document describes how to use the Humidity Sensor PICtail™ Demo Board as a

development tool to emulate and debug firmware on a target board. The manual layout

is as follows:

•Chapter 1. “Product Overview” – This is an introduction to the Humidity Sensor

PICtail™ Demo Board. It covers the kit contents, associated tools and how they

work together.

•Chapter 2. “Setup and Installation” – Covers the initial set-up of the Humidity

Sensor PICtail™ Demo Board. It lists the required tools, shows how to connect

this board and demonstates how to verify the set-up.

•Chapter 3. “Operation” – This chapter discusses using the humidity sensor on

the PCB and using the software PC Application.

• Chapter 4. “Modified Circuit” – Gives the modifications necessary to increase

measurement resolution by a factor of 100 (see AN1016 for details)

•Appendix A. “Schematic and Layouts” – Gives detailed information on the

Humidity Sensor PICtail™ Demo Board. Includes detailed circuit explanation,

schematic and board layouts.

•Appendix B. “Bill Of Materials (BOM)” – Gives detailed information on the

Humidity Sensor PICtail™ Demo Board’s firmware.

NOTICE TO CUSTOMERS

All documentation becomes dated, and this manual is no exception. Microchip tools and

documentation are constantly evolving to meet customer needs, so some actual dialogs

and/or tool descriptions may differ from those in this document. Please refer to our web site

(www.microchip.com) to obtain the latest documentation available.

Documents are identified with a “DS” number. This number is located on the bottom of each

page, in front of the page number. The numbering convention for the DS number is

“DSXXXXXA”, where “XXXXX” is the document number and “A” is the revision level of the

document.

Humidity Sensor PICtail™ Demo Board User’s Guide

CONVENTIONS USED IN THIS GUIDE

This manual uses the following documentation conventions:

DOCUMENTATION CONVENTIONS

Description Represents Examples

Arial font:

Italic characters Referenced books MPLAB®IDE User’s Guide

Emphasized text ...is the only compiler...

Initial caps A window the Output window

A dialog the Settings dialog

A menu selection select Enable Programmer

Quotes A field name in a window or

dialog

“Save project before build”

Underlined, italic text with

right angle bracket

A menu path File>Save

Bold characters A dialog button Click OK

A tab Click the Power tab

N‘Rnnnn A number in verilog format,

where N is the total number of

digits, R is the radix and n is a

digit.

4‘b0010, 2‘hF1

Text in angle brackets < > A key on the keyboard Press <Enter>, <F1>

Courier New font:

Plain Courier New Sample source code #define START

Filenames autoexec.bat

File paths c:\mcc18\h

Keywords _asm, _endasm, static

Command-line options -Opa+, -Opa-

Bit values 0, 1

Constants 0xFF, ‘A’

Italic Courier New A variable argument file.o, where file can be

any valid filename

Square brackets [ ] Optional arguments mcc18 [options] file

[options]

Curly brackets and pipe

character: { | }

Choice of mutually exclusive

arguments; an OR selection

errorlevel {0|1}

Ellipses... Replaces repeated text var_name [,

var_name...]

Represents code supplied by

user

void main (void)

{ ...

}

Preface

RECOMMENDED READING

This user's guide describes how to use Humidity Sensor PICtail™ Demo Board. Other

useful documents are listed below and are recommended as supplemental reference

resources.

PICkit™ 2 Microcontroller Programmer User’s Guide (DS51553)

Contains instructions on how to use the PICkit 2 Microcontroller Programmer hardware

and software.

PICkit™ 1 Flash Starter Kit User’s Guide (DS40051)

Contains instructions on how to use the PICkit 1 Flash Starter Kit hardware and

software.

MPLAB®ICD 2 In-Circuit Debugger User’s Guide (DS51331)

This user’s guide covers Microchip’s low cost, real-time debugger and programmer for

selected PICmicro®Microcontrollers (MCUs) and dsPIC®Digital Signal Controllers

(DSCs).

AN1016, “Detecting Small Capacitive Sensors Using the MCP6291 and

PIC16F690 Devices” (DS01016)

Explains the functionality and design of this board’s circuit. Contains measurement

results.

MCP6291/2/3/4/5 Data Sheet (DS21812)

Gives detailed information on the MCP6291/2/3/4/5 Op Amps.

PIC16F685/687/689/690 Data Sheet (DS41262)

Gives detailed information on the microcontroller used on the Humidity Sensor PICtail™

Demo Board.

PIC16C745/765 Data Sheet (DS41124)

Gives detailed information on the PICmicro microcontroller used on the PICkit 1 Flash

Starter Kit.

The following document is available on the internet from the company listed, and is

recommended as a supplemental reference resource.

Humirel, “Relative Humidity Sensor HS1100LF / HS1101LF,” Data Sheet, Rev. C,

Sept. 2004.

Gives detailed information on Humirel’s (www.humirel.com) HS1101LF capacitive

relative humidity sensor.

Humidity Sensor PICtail™ Demo Board User’s Guide

THE MICROCHIP WEB SITE

Microchip provides online support via our web site at www.microchip.com. This web

site is used as a means to make files and information easily available to customers.

Accessible by using your favorite Internet browser, the web site contains the following

information:

•Product Support – Data sheets and errata, application notes and sample

programs, design resources, user’s guides and hardware support documents,

latest software releases and archived software

•General Technical Support – Frequently Asked Questions (FAQs), technical

support requests, online discussion groups, Microchip consultant program

member listing

•Business of Microchip – Product selector and ordering guides, latest Microchip

press releases, listing of seminars and events, listings of Microchip sales offices,

distributors and factory representatives

CUSTOMER SUPPORT

Users of Microchip products can receive assistance through several channels:

• Distributor or Representative

• Local Sales Office

• Field Application Engineer (FAE)

• Technical Support

• Development Systems Information Line

Customers should contact their distributor, representative or field application engineer

(FAE) for support. Local sales offices are also available to help customers. A listing of

sales offices and locations is included in the back of this document.

Technical support is available through the web site at: http://support.microchip.com

DOCUMENT REVISION HISTORY

Revision A (December 2005)

• Initial Release of this Document.

HUMIDITY SENSOR PICTAIL™

DEMO BOARD USER’S GUIDE

Chapter 1. Product Overview

1.1 INTRODUCTION

The Printed Circuit Board (PCB) discussed in this user’s guide is described as follows:

This board supports the capacitive humidity sensor application note AN1016. It

measures the capacitance of a relative humidity sensor (or capacitor) plugged into the

board. The on-board microcontroller sends the measured and calculated data to a PC

(Personal Computer) for display.

Items discussed in this chapter include:

• Kit Contents

• Humidity Sensor PICtail™ Demo Board

• Associated Tools

• Initial Set-up

1.2 KIT CONTENTS

• Humidity Sensor PICtail™ Demo Board – This is an assembled and tested

Printed Circuit Board (PCB).

• CD-ROM – Provided separately in the shipping box; it contains the files and

literature mentioned in this user’s guide.

• Humidity Sensor (HS1101LF) – Provided separately in the shipping box.

• Bag of Capacitors – Provided separately in the shipping box. These capacitors

are provided for the user’s convenience; they make it easy to try out this board’s

functionality, and to verify its accuracy.

1.3 HUMIDITY SENSOR PICTAIL™ DEMO BOARD

The circuit operation is detailed in AN1016, “Detecting Small Capacitive Sensors Using

the MCP6291 and PIC16F690 Devices” (DS01016)

The Humidity Sensor PICtail™ Demo Board contains the circuitry represented in

Figure 1-1. The ambient relative humidity changes the capacitance of the humidity

sensor (HS1101LF from Humirel). This sensor is connected to a MCP6291 op amp and

a resistor to form an inverting (Miller) integrator. The PIC16F690 microcontroller sends

a square wave to the input of the integrator, which the integrator converts to a triangle

wave at its output. The firmware controls the magnitude of the triangle wave and

measures the integration time. The microcontroller measures the time it takes for the

triangle wave to rise and fall. These times are converted to a capacitance value.

A 14-pin header is provided for connecting to the PICkit™ 1 Flash Starter Kit, which

acts like a docking station. It includes a two-wire serial bus that transfers the data, and

two more wires for board power (+5V and GND inputs). This interface also supports

programming of the on-board PIC16F690.

• Order Number: PIC16F690DM-PCTLHS

• Assembly Number: 102-00084R1

•BoardName: Humidity Sensor PICtail™ Demo Board

Humidity Sensor PICtail™ Demo Board User’s Guide

The +5V single supply voltage from the PICkit™ 1 Flash Starter Kit board is bypassed

with two bulk 1 μF capacitors near the header, and two local 0.1 μF capacitors (one for

each Integrated Circuit (IC)).

A 6-pin header for ICSP™ (In-Circuit Serial Programming™) is available as an alternate

interface for programming the on-board PIC16F690. This allows the user to modify the

program that comes with the Humidity Sensor PICtail™ Demo Board (with the MPLAB®

ICD 2 or PICkit™ 2 microcontroller programmer).

FIGURE 1-1: Humidity Sensor PICtail™ Demo Board Block Diagram.

The test points make it easier to test key points in the circuit using common lab

equipment. The test points are:

• GND – Is connected to ground plane, and is for any lab equipment

• +5V – Positive supply voltage (at board edge); it provides a means to power this

board with a laboratory power supply (when not connected to the PICkit™ 1 Flash

Starter Kit)

•V

INT – Integrator’s input (a square wave during measurements)

•V

CM – Op amp’s common mode voltage (at its inverting input)

•V

SEN – Integrator’s output of the integrator (a triangle wave during

measurements)

More details on the circuit and on its design can be found in Appendix A. “Schematic

and Layouts” and AN1016, “Detecting Small Capacitive Sensors Using the MCP6291

and PIC16F690 Devices” (DS01016).

GND

+5V

Ambient

Vint

Humidity

Op Amp

MCP6291

Microcontroller

PIC16F690

Humidity Sensor

PICtail™ Demo Board

Vcm

+5V

Vsen

Humidity

Test Poin ts

Sensor

GND

N.C.

ICSP™

PICkit™ 1 Flash

Starter Kit

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