Simple In- and Output Processing Sketch
import processing.serial.*;
import cc.arduino.*;
Arduino arduino;
int led_pin = 11;
void setup() {
size(200, 200);
// Prints out the available serial ports.
println(Arduino.list());
arduino = new Arduino(this, Arduino.list()[0], 57600);
arduino.pinMode(led_pin, Arduino.OUTPUT);
}
void draw() {
//change brightness of led by mouseX position ---------------
float ina = (float(mouseX)/float(width))*255;
arduino.analogWrite(pin, int(ina)); // change led brightness along mouseX
//draw a circle with fillcolor controlled by poti ---------------
int potiIn0 = arduino.analogRead(0); // read poti value
fill( potiIn0/4 ); //map poti value from 1024 to 255
circle(100,100,22);
}
AnalogCommunication Firmata for Arduino
/*
* Firmata is a generic protocol for communicating with microcontrollers
* from software on a host computer. It is intended to work with
* any host computer software package.
*
* To download a host software package, please click on the following link
* to open the list of Firmata client libraries in your default browser.
*
* https://github.com/firmata/arduino#firmata-client-libraries
*/
/* This firmware supports as many analog ports as possible, all analog inputs,
* four PWM outputs, and two with servo support.
*
* This example code is in the public domain.
*/
#include <Servo.h>
#include <Firmata.h>
/*==============================================================================
* GLOBAL VARIABLES
*============================================================================*/
/* servos */
Servo servo9, servo10; // one instance per pin
/* analog inputs */
int analogInputsToReport = 0; // bitwise array to store pin reporting
int analogPin = 0; // counter for reading analog pins
/* timer variables */
unsigned long currentMillis; // store the current value from millis()
unsigned long previousMillis; // for comparison with currentMillis
/*==============================================================================
* FUNCTIONS
*============================================================================*/
void analogWriteCallback(byte pin, int value)
{
switch (pin) {
case 9: servo9.write(value); break;
case 10: servo10.write(value); break;
case 3:
case 5:
case 6:
case 11: // PWM pins
analogWrite(pin, value);
break;
}
}
// -----------------------------------------------------------------------------
// sets bits in a bit array (int) to toggle the reporting of the analogIns
void reportAnalogCallback(byte pin, int value)
{
if (value == 0) {
analogInputsToReport = analogInputsToReport & ~ (1 << pin);
}
else { // everything but 0 enables reporting of that pin
analogInputsToReport = analogInputsToReport | (1 << pin);
}
// TODO: save status to EEPROM here, if changed
}
/*==============================================================================
* SETUP()
*============================================================================*/
void setup()
{
Firmata.setFirmwareVersion(FIRMATA_FIRMWARE_MAJOR_VERSION, FIRMATA_FIRMWARE_MINOR_VERSION);
Firmata.attach(ANALOG_MESSAGE, analogWriteCallback);
Firmata.attach(REPORT_ANALOG, reportAnalogCallback);
servo9.attach(9);
servo10.attach(10);
Firmata.begin(57600);
}
/*==============================================================================
* LOOP()
*============================================================================*/
void loop()
{
while (Firmata.available())
Firmata.processInput();
currentMillis = millis();
if (currentMillis - previousMillis > 20) {
previousMillis += 20; // run this every 20ms
for (analogPin = 0; analogPin < TOTAL_ANALOG_PINS; analogPin++) {
if ( analogInputsToReport & (1 << analogPin) )
Firmata.sendAnalog(analogPin, analogRead(analogPin));
}
}
}