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CAPACITIVE SENSING AND LED MESSAGING SYSTEM

AHMAD LUTFI BIN SELAMATAE070144

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Content• Introduction• Problem Background• Research Question• Objective• Scope of the study• Literature Review• Research Methodology• Gantt Chart• Current Progress and Expected Result• Conclusion• References

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Introduction• Concept of capacitor• PCB• LED messaging system

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Problem Background• The production line.• On the convey.

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Research Question• Making capacitive touch sensor panel on PCB• LED as the output

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Research ObjectiveThe objective of the project as follow:• To construct a planar capacitive sensor on

printed circuit board (PCB)• To design and simulate the capacitive sensing

and LED messaging system circuit.• To construct a LED messaging system based a

panel of LED matrix.

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Scope of the study• Making the capacitive touch sensor. Act as

switch.• Use PIC16F84A as main controller.• LED messaging as output or sign of alert to

user.

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Literature ReviewTheory• The capacitive sensor detect capacitance

change. human’s touch give result value of 100 to 250 pF with body resistance from 1000 to 2000 ohms

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• Basic formula for calculating capacitance

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• Capacitive sensing using frequency change

the

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• The oscillator will oscillate a frequency.

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• The frequency changes when touched by finger

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• When capacitance increased, the frequency will decrease

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Basic Construction of the capacitive sensor

• Concept is same as the normal capacitor.

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Related product on the market

• Touch Lamp

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Hardware• PIC16F84A

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Research methodology• Block diagram of system

Capacitive Sensor

Frequency changes

Microcontroller system:

PIC16F84A

LED Messaging display

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Sensor Development• The size of sensor which is suitable to user.• The design of the sensor (square and circle)• The capacitance of the sensor

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• Diameter of the circle is 1cm.

The layout of the sensor that will be printed on the PCB

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Hardware and Circuit design• Designing the circuit using Proteus– PIC circuit– LED circuit– Sensor circuit

• Programming software: MPLab software

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System• Capacitive sensor pad 1 is

a switch fo LED 1• Capacitive sensor pad 2 is

a switch fo LED 2• Capacitive sensor pad 3 is

a switch fo LED 3

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Gantt Chart

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Current Progress• Modeling the concept design of capacitive

sensor in Google SketchUp.

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• Find a capacitive sensor on the market for reference

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Expected Result

D

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Conclusion• The capacitive sensing is the other alternative

to the mechanical switch

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References• Bellis, M. (n.d.). Who Invented Touch Screen

Technology? Retrieved October 21, 2011, from About.com Inventors: http://inventors.about.com/od/tstartinventions/a/Touch-Screen.htm

• Kunen, S. M. (1987). Patent No. 4,668,877. United States of America.

• M.A. Kelly, G. S. (1993, November 15-19). An Investigation of Human Body Electrostatic Discharge. Retrieved November 15, 2011, from Automotive Electronics Council : www.aecouncil.com/Papers/aec1.pdf

• Pillow, C. (n.d.). Where Was the Touch Lamp Invented? Retrieved October 2011, 15, from eHow: http://www.ehow.com/facts_5997950_touch-lamp-invented_.html

• R.Tschaggelar, I. (2003). PCB Design. Retrieved November 7, 2011, from IBRT Scientific and Engineering Solitions: http://www.ibrtses.com/software/pcbdesign.html

• Technology, M. (2004, May 17). PIC16F84A Data Sheet. Retrieved September 3, 2011, from Microchip Technology Inc. : ww1.microchip.com/downloads/en/devicedoc/35007b.pdf

• Tom Perme, M. T. (2007, July 12). AN1102, Layout and Physical Design Guidelines for Capacitive Sensing. Retrieved September 3, 2011, from Microchip Technology Inc.: ww1.microchip.com/downloads/en/AppNotes/01102a.pdf

• Baxter, L. K. (2000, June 26). Capacitive Sensors. Retrieved September 5, 2011, from Capsense: www.capsense.com/capsense-wp.pdf

• SEMTECH. (2010, April 1). Capacitive Touch Sensing Layout Guidelines. Retrieved Sepetember 13, 2011, from SEMTECH: http://www.semtech.com/images/datasheet/capacitive-touch-sensing-layout-guidelines-an.pdf


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