I wrote some code for the TouchShield and Arduino to make a basic GUI that I'm calling pArduOS. For some reason, the RFID reader (Parallax) and the Ping)) won't report their data to the computer.
Code follows:
TouchShield Code
void setup() {
Serial.begin(9600);
background(0,0,0);
stroke(255);
text("pArduOS, Version .1",205,2);
text("Written by Adam Aitoumeziane",150,10);
text("Includes code samples from arduino.cc",95,18);
fill(0,0,255);
rect(0,0,50,50);
text("Ping",12,22);
fill(0,255,0);
rect(0,75,50,50);
text("RFID",12,97);
}
void loop() {
gettouch();
if(mouseX > 0 & mouseX < 50 & mouseY > 0 & mouseY < 50) {
Serial.print('A');
}
if(mouseX > 0 & mouseX < 50 & mouseY > 75 & mouseY < 125) {
Serial.print('B');
}
}
Arduino Code
#include <AFSoftSerial.h>
#define RXPIN 3
#define TXPIN 2
int pingPin = 7;
char myChar;
int val = 0;
char code[10];
int bytesread = 0;
AFSoftSerial tss = AFSoftSerial(RXPIN,TXPIN);
void setup() {
tss.begin(9600);
Serial.begin(2400); // RFID reader SOUT pin connected to Serial RX pin at 2400bps
pinMode(4,OUTPUT); // Set digital pin 2 as OUTPUT to connect it to the RFID /ENABLE pin
digitalWrite(4, LOW); // Activate the RFID reader
}
void loop() {
if(Serial.available() > 0) {
myChar = tss.read();
}
if(myChar == 'A') {
pingProg();
}
if(myChar == 'B') {
rfidProg();
}
}
int pingProg() {
long duration, inches, cm;
// The PING))) is triggered by a HIGH pulse of 2 or more microseconds.
// We give a short LOW pulse beforehand to ensure a clean HIGH pulse.
pinMode(pingPin, OUTPUT);
digitalWrite(pingPin, LOW);
delayMicroseconds(2);
digitalWrite(pingPin, HIGH);
delayMicroseconds(5);
digitalWrite(pingPin, LOW);
// The same pin is used to read the signal from the PING))): a HIGH
// pulse whose duration is the time (in microseconds) from the sending
// of the ping to the reception of its echo off of an object.
pinMode(pingPin, INPUT);
duration = pulseIn(pingPin, HIGH);
// convert the time into a distance
inches = microsecondsToInches(duration);
cm = microsecondsToCentimeters(duration);
Serial.print(inches);
Serial.print("in, ");
Serial.print(cm);
Serial.print("cm");
Serial.println();
delay(100);
}
int rfidProg() {
if(Serial.available() > 0) { // if data available from reader
if((val = Serial.read()) == 10) { // check for header
bytesread = 0;
while(bytesread<10) { // read 10 digit code
if( Serial.available() > 0) {
val = Serial.read();
if((val == 10)||(val == 13)) { // if header or stop bytes before the 10 digit reading
break; // stop reading
}
code[bytesread] = val; // add the digit
bytesread++; // ready to read next digit
}
}
if(bytesread == 10) { // if 10 digit read is complete
Serial.print("TAG code is: "); // possibly a good TAG
Serial.println(code); // print the TAG code
}
bytesread = 0;
delay(500); // wait for a second
}
}
}
long microsecondsToInches(long microseconds)
{
// According to Parallax's datasheet for the PING))), there are
// 73.746 microseconds per inch (i.e. sound travels at 1130 feet per
// second). This gives the distance travelled by the ping, outbound
// and return, so we divide by 2 to get the distance of the obstacle.
// See: http://www.parallax.com/dl/docs/prod/acc/28015-PING-v1.3.pdf
return microseconds / 74 / 2;
}
long microsecondsToCentimeters(long microseconds)
{
// The speed of sound is 340 m/s or 29 microseconds per centimeter.
// The ping travels out and back, so to find the distance of the
// object we take half of the distance travelled.
return microseconds / 29 / 2;
}