Hardware Reference
In-Depth Information
SendSerialMessage = false; // reset the need to send data to the Arduino
}//end testApp::update
void testApp::draw(){ // defines placement and draws objects in the window
ofFill(); // fills geometry with a solid color
if (Returned == 'h') // is the button on the Arduino being pressed
ofSetColor(0,0,255); // set the first circle color to full blue
else // the button is not pressed or the state is not known
ofSetColor(0,0,127); // set the first circle color to 1/2 blue
ofCircle(50,50, 50); // draw the first circle at last set color
if (ledcommand == 'a') // should the LED be on
ofSetColor(0,255,0); // set color to full green for the second circle
else // LED should be off or not known
ofSetColor(0,127,0); // set color to 1/2 green for the second circle
ofCircle(150,50, 50); // draw the second circle at last set color
} //end void testApp::draw()
void testApp::mousePressed(int x, int y, int button){
SendSerialMessage = true; // inform update function that there is data to send
if(ledcommand == 'a') // if the LED is ON
ledcommand = 's'; // change LED to be OFF
else // if the LED is OFF
ledcommand = 'a'; // change LED to be ON
} //end testApp::mousePressed
Verifying the Code
Make sure that the Arduino that was set up in Listing 3-1 is plugged into the computer and take note of the port that it
is plugged into.
COM*
is for Windows
•
/dev/tty*
is used for Linux/Unix and Mac OS X
Change the
serial.setup(COM4,9600)
line in Listing 3-4 to match the Arduino's connecting point. Once the test
app is set to know where the Arduino is, compile the examples. Running the program will open a window frame that
looks like Figure
3-2
, with the first circle representing the push button and the second circle showing the state of the
LED. To change the LED state, click in the window with the mouse.
•
Figure 3-2.
Example of the running program
