/* Open Source Foot Placement Detector

This sketch reads 4 piezo elements to detect a pressure of the foot.

It writes piezo data to the serial port. This makes for a great

research project for any person in the world or science fair project

for junior high school students and senior high school students.

The circuit:

* Sew each one of 4 piezo elements to the foot bottom of

* a sock. Solder and heat shrink the leads to on end

* of a CAT-5 or CAT-6 UTP cable about 6 foot in length.

* Use each pair for one piezo element:

* + connection of the piezo attached to analog in 0 with is the

* solid color in the twisted pair.

* - connection of the piezo attached to ground is the striped

* color in the twisted pair.

* The other end of the UTP cable is an RJ-45 plug.

*

* Connect the Solid green wire in the RJ45 receptacle

* to one side of a 1-megaohm resistor.

* Connect the Solid orange wire in the RJ45 receptacle

* to one side of a 1-megaohm resistor.

* Connect the Solid blue wire in the RJ45 receptacle

* to one side of a 1-megaohm resistor.

* Connect the Solid broun wire in the RJ45 receptacle

* to one side of a 1-megaohm resistor.

* All the striped wires in the RJ45 receptacle box are

* tied together and connected to other side of all

* four of the 1-megaohm resistors.

* Each one of the solid and striped colors in the

* RJ45 receptacle box s connected to the Arduino via

* a short piece of UTP cable.

* Solid Green of this cable goes to the analog pin 0

* Solid Orange of this cable goes to the analog pin 1

* Solid Blue of this cable goes to teh analog pin 2

* Solid Brown of this cable goes to the analog pin 3

* All of the striped colors of this cable go to the

* ground pin on Arduino.

The operation:

* 1. You wear the sock with the piezos on the bottom of you foot.

* 2. You can put another sock of that sock to protect the piezos.

* 3. Now you are ready to put on the shoes, that you want to test.

* You can even forget the shoes if you want to do a control

* test first.

* 4. Plug the cable into the RJ45 jack that is connected to the

* Arduino.

* 5. You turn on power to the Arduino and plug it into your

* Windows Box, Macintosh Box, or Linux Box that has the Arduino

* Terminal monitor program. Any serial port terminal program

* could also do at 9600bps. The Arduino software is needed

* for you to program your new Arduino with this program.

* 6. Open the Arduino Terminal monitor program.

* 7. Turn the switch to on when you want to acquire your test

* results. This can be right away or after you started

* walking or running.

* 8. You can turn the switch off anytime you are satisfied with

* your results.

This circuit is written by Shawn L. Gabriel

* created 11 April 2k10

* email shawnleegabriel@hotmail.com

This circuit is based on the followig tutorial

* http://www.arduino.cc/en/Tutorial/Knock

* created 25 Mar 2007

* by David Cuartielles <http://www.0j0.org>

* modified 30 Jun 2009

* by Tom Igoe

*/

// these constants won't change:

const int FootSensor1 = 0; // the piezo is connected to analog pin 0

const int FootSensor2 = 1; // the piezo is connected to analog pin 1

const int FootSensor3 = 2; // the piezo is connected to analog pin 2

const int FootSensor4 = 3; // the piezo is connected to analog pin 3

// Pulse In Pin

const int ReadPin = 9; // pin for counting pulses

// these variables will change:

int footsensorReading1 = 0; // variable to store the value read from

// the sensor pin

int footsensorReading2 = 0; // variable to store the value read from

// the sensor pin

int footsensorReading3 = 0; // variable to store the value read from

// the sensor pin

int footsensorReading4 = 0; // variable to store the value read from

// the sensor pin

void setup() {

Serial.begin(9600); // use the serial port

}

void loop() {

// read the sensors and store it in the variables for sensorReadings:

if (ReadPin == 0) {

footsensorReading1 = analogRead(FootSensor1);

footsensorReading2 = analogRead(FootSensor2);

footsensorReading3 = analogRead(FootSensor3);

footsensorReading4 = analogRead(FootSensor4);

Serial.print("sensorReading1 = ");

Serial.println(footsensorReading1);

delay(10); // delay to avoid overloading the serial port buffer

Serial.print("sensorReading2 = ");

Serial.println(footsensorReading2);

delay(10); // delay to avoid overloading the serial port buffer

Serial.print("sensorReading3 = ");

Serial.println(footsensorReading3);

delay(10); // delay to avoid overloading the serial port buffer

Serial.print("sensorReading4 = ");

Serial.println(footsensorReading4);

delay(10); // delay to avoid overloading the serial port buffer

Serial.println("============");

delay(10); // delay to avoid overloading the serial port buffer

}

delay(100); // delay to avoid overloading the serial port buffer

}