Jerk the Bear

1
Jerk the Bear

Hardware
Software
For this project, several different hardware
components were needed. First was the CY3214
PsoCEval USB kit by Cypress. The small speaker on
the CY3214 will be used as output, for when one
touches the sensors, it will project a sound.
Next was a bear bean-filled stuffed animal (who
has been named Jerk). Then there were our
handmade copper tape capacitive switch sensors.
The plastic beans were taken out of Jerk, the
sensors were taped to the underside of his back,
and then he was refilled with the plastic beans
and sewn back up. All of these pieces of hardware
in our project are prevalent in everyday life in
the things we use and are an integral part of
technology today. Speakers, low power
microprocessors, touch sensors, and various ways
for such technology to be integrated in daily
interaction is the force driving technological
progress today.
Software plays an integral role in our project.
Beginning with the creation of our code for the
board, we utilized PsoC Designer 5, a software
development kit and integrated development
environment for the C programming language. With
its powerful system level and chip level choices
for development environments, PsoC was an ideal
choice over the other available program, Dev-C.
Using basic C libraries as well as some PsoC
specific libraries imported in PsoC developer we
were able to program various ports on the board
specifically for our own custom array of
capacitative sensors. We used an Imagecraft
compiler and then used PsoC Programmer to program
the board, both of which come as part of the
package with the Cypress boards we have been
supplied with. The actual software running on our
single program board is entirely C-based and runs
in an infinite while loop to continuously check
for user input which is the central focus of the
project.
Hypothesis
By implementing CapSense sensors inside of a
stuffed animal, we can change an ordinary stuffed
toy into an interactive one that can respond to
touch and make sounds based upon its mood and
prove that CapSense technology can be useful in
providing an efficient and easy to use interface
that allows more user interaction with certain
objects.
Statement of Purpose
Source Code
Procedure
In order to explore the possiblities of the
integration of capacitative sensors in consumer
products, we implemented capsense technology in a
common stuffed animal. The application of
capacitative sensors is relatively new to the
field of electronics, and user inputs
specifically. By finding techniques and methods
to better implement capacitative sensors in a
stuffed animal, the possibilities for increased
user interaction with traditionally inanimate
products greatly increases, thereby opening new
markets for an entirely new type electronics.
With the production of embedded systems
proliferating almost every aspect of daily life,
it is only inevitable that such products will
enter mainstream consumption and to have the
technology ready and experience available when
the market is ready is an invaluable advantage in
the industry.

• Writing the Code
• Double click PsoC Designer 5 to open the program
• Click File ?Open New Project
• Select chip level project, set project name, and
  set project filepath
• Proceed to code for the capsense array, speaker,
  and PsoC board as a whole
• Click File?Save
• Set compiler to IMAGECRAFT
• Hit F6 to compile the program
• Debug and fix the code if any errors occur
• Recompile once all errors have been fixed
• Programming the Board
• Plug the MiniProg device into a USB port on the
  computer
• Start the PsoC Programmer application
• Choose device family 29x66
• Choose model number 29466
• Click File Load and browse to find the .hex
  file for the project
• Click Program

include ltm8c.hgt include
"PSoCAPI.h" include "PWM8_1.h" int freq int
out_freq long delay char frequency char
frequency1 char frequency2 char frequency3 int
count, anger,in 0 float a 261.63 float b
277.18 float c 293.66 float d 311.13 float
e 329.63 float f 349.23 float g
369.99 float h 392.00 float i 415.30 float
j 440.00 float k 466.16 float l
493.88 float m 523.25 float n 554.37 float
o 587.33 float p 622.25 float q
659.26 float r 698.46 float s 739.99 float
t 783.99 float u 830.61 float v
880.00 float w 932.33 float x 987.77 float
y 1046.50 float z 1108.73 int playNote(int
frequency) int outFrequency
34000/frequency return outFrequency void
main() LCD_1_Start() M8C_EnableGInt CSD_
1_Start() LCD_1_Position(0,0)
LCD_1_PrCString("Jerk the Bear") CSD_1_Initializ
eBaselines() CSD_1_SetDefaultFingerThresholds(
) while (1) while(count5) for(in
0inlt10in) frequency
playNote(a) PWM8_1_WritePeriod(frequency)
PWM8_1_WritePulseWidth(20) PWM8_1_Start()
for(delay4000delaygt0delay--) frequency
playNote(b) PWM8_1_WritePeriod(frequency)
PWM8_1_WritePulseWidth(20) PWM8_1_Start(
) for(delay4000delaygt0delay--) freque
ncy playNote(c) PWM8_1_WritePeriod(frequenc
y) PWM8_1_WritePulseWidth(20) PWM8_1_Sta
rt() for(delay4000delaygt0delay--)
count count5 if(count
8) PWM8_1_Stop()
CSD_1_ScanAllSensors() CSD_1_UpdateAllBasel
ines() LCD_1_Position(1,0) LCD_1_PrHexInt(
count) if(CSD_1_bIsAnySensorActive()) LCD_
1_InitBG(0) if(CSD_1_bIsSensorActive(10))
count for(delay 70000delaygt0delay--)

Project Goals Guidelines
As an ultimate end-goal of the project, we hope
to have expanded the knowledge and use of
capacitive sensors in commercial products. By
exploring new uses for such sensors where they
previously were confined to higher end
electronics, we can increase industry innovation
in the seemingly stagnant field of human
interface design. To do so, we incorporated low
level C programming with knowledge of hardware
design, electric circuitry, and practical crafts
skill with needle and thread to present a
finished product. The bear, Jerk as we
affectionately named him, wasnt the end goal of
the project but a way to start even more work and
progress he was a stepping stone into new types
of interaction between man and machine.
Copper Tape Capacitative Sensors
Jessica Weinman, Alvin Sun, Eric Jensen Shirley
Miranda Adventures in Embedded Systems July, 2008