updated Firmata library to version 2.3.5 and moved to the new library format

libraries/Firmata/examples/SimpleAnalogFirmata/SimpleAnalogFirmata.ino

@@ -0,0 +1,46 @@
+/*
+ * 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 clink on the following link
+ * to open the download page in your default browser.
+ *
+ * http://firmata.org/wiki/Download
+ */
+
+/* Supports as many analog inputs and analog PWM outputs as possible.
+ *
+ * This example code is in the public domain.
+ */
+#include <Firmata.h>
+
+byte analogPin = 0;
+
+void analogWriteCallback(byte pin, int value)
+{
+    if (IS_PIN_PWM(pin)) {
+        pinMode(PIN_TO_DIGITAL(pin), OUTPUT);
+        analogWrite(PIN_TO_PWM(pin), value);
+    }
+}
+
+void setup()
+{
+    Firmata.setFirmwareVersion(0, 1);
+    Firmata.attach(ANALOG_MESSAGE, analogWriteCallback);
+    Firmata.begin(57600);
+}
+
+void loop()
+{
+    while(Firmata.available()) {
+        Firmata.processInput();
+    }
+    // do one analogRead per loop, so if PC is sending a lot of
+    // analog write messages, we will only delay 1 analogRead
+    Firmata.sendAnalog(analogPin, analogRead(analogPin)); 
+    analogPin = analogPin + 1;
+    if (analogPin >= TOTAL_ANALOG_PINS) analogPin = 0;
+}
+