Hi,
I have a project where we're using Processing to read through a .txt file to pick out certain keywords. I think this is the relevant bit of that code:
StringTokenizer st =
new StringTokenizer(data, "\"<>,.()[] ");// break it down
while (st.hasMoreTokens ()) {
// each chunk of data is made
chunk = st.nextToken().toLowerCase() ;
if (chunk.indexOf("democrat") >= 0 ) // found "love"?
love++; // increment love by 1
if (chunk.indexOf("trump") >= 0) // found "peace"?
peace++; // increment peace by 1
if (chunk.indexOf("republican") >= 0) // found "arduino"?
arduino++; // increment arduino by 1
in this instance, Processing is finding the words and adding to a counter, which Arduino uses to adjust the intensity of some LEDs. The Arduino code for that process looks like this:
Serial.println(inByte); // print the value to
// the serial port
if (Serial.available() > 0) {
// read the incoming byte:
inByte = Serial.read();
// If the marker's found, next 6 characters are the colour
if (inByte == '#') {
while (pointer < 6) { // accumulate 6 chars
buffer[pointer] = Serial.read(); // store in the buffer
pointer++; // move the pointer forward by 1
}
// now we have the 3 numbers stored as hex numbers
// we need to decode them into 3 bytes r, g and b
r = hex2dec(buffer[1]) + hex2dec(buffer[0]) * 16;
g = hex2dec(buffer[3]) + hex2dec(buffer[2]) * 16;
b = hex2dec(buffer[5]) + hex2dec(buffer[4]) * 16;
pointer = 0; // reset the pointer so we can reuse the buffer
}
}
btn = digitalRead(BUTTON); // read input value and store it
// Check if there was a transition
if ((btn == HIGH) && (old_btn == LOW)){
state = 1 - state;
}
old_btn = btn; // val is now old, let's store it
if (state == 1) { // if the lamp is on
analogWrite(R_LED, r); // turn the leds on
analogWrite(G_LED, g); // at the colour
analogWrite(B_LED, b); // sent by the computer
} else {
analogWrite(R_LED, 0); // otherwise turn off
analogWrite(G_LED, 0);
analogWrite(B_LED, 0);
}
delay(100); // wait 100ms between each send
}
int hex2dec(byte c) { // converts one HEX character into a number
if (c >= '0' && c <= '9') {
return c - '0';
} else if (c >= 'A' && c <= 'F') {
return c - 'A' + 10;
}
}
I'm trying to modify that code so that instead of turning on LEDs, Arduino turns the found word into a tone with the Piezo buzzer with the tone() function. I don't know where to start on the Arduino code to get it to receive the information from Processing (that it found a keyword) and turn it into a tone.
I hope the code I've posted here will help with some guidance. Thanks in advance for any help.