Identification - Making Things Talk - page 334

This Processing sketch
sends commands
to the SM130 module, and reads the
result. The SM130's default data rate is
19200bps. Type s to select a tag in the
field, and type any other key to read
the firmware version.

Talk to It

/*
SonMicro Firmware version reader
Context: Processing
*/
import processing.serial.*;
Serial myPort; // The serial port
String binaryString = "";
String asciiString = "";

void setup() {
size(500, 200); // window size
// List all the available serial ports
println(Serial.list());
// Open whatever port is the one you're using.
myPort = new Serial(this, Serial.list()[2], 19200);
}

void draw() {
// Dystopian waterscape color scheme,
// by arem114, http://kuler.adobe.com/
background(#7B9B9D);
fill(#59462E);
// write the response, in hex and ASCII:
text(binaryString, 10, height/3);
text(asciiString, 10, 2*height/3);
}

void keyReleased() {
int command = 0x81; // read firmware command is the default
int dataLength = 1; // data length for both commands here is 1
if (key == 's') { // "select tag" command
command = 0x83;
}
// send command:
myPort.write(0xFF);
myPort.write(0x00);
myPort.write(dataLength);
myPort.write(command);
myPort.write(command + dataLength);
// reset the response strings:
binaryString = "";
asciiString = "";
}

void serialEvent(Serial myPort) {
// get the next incoming byte:
char thisChar = (char)myPort.read();
// add the byte to the response strings:
binaryString += hex(thisChar, 2) + " ";
asciiString += thisChar;
}