MIDI-out and MCP23017 sketch

source/library/input_4051/input_4051.cpp

@@ -0,0 +1,42 @@
+/*
+  Morse.cpp - Library for flashing Morse code.
+  Created by David A. Mellis, November 2, 2007.
+  Released into the public domain.
+*/
+
+#include "Arduino.h"
+#include "input_4051.h"
+
+const int tolerance = 4;
+
+input_4051::input_4051(int analogPin, int s0Pin, int s1Pin, int s2Pin, void (*valueChangeCallback(int,int)))
+{
+	_analog = analogPin;
+	_s0 = s0Pin;
+	_s1 = s1Pin;
+	_s2 = s2Pin;
+	pinMode(_analog,INPUT);
+	pinMode(_s0,OUTPUT);
+	pinMode(_s1,OUTPUT);
+	pinMode(_s2,OUTPUT);
+	_valueChangeCallback = valueChangeCallback;
+	_value = {-1,-1,-1,-1,-1,-1,-1,-1};
+}
+
+void input_4051::loop()
+{
+	for (count=0; count<=7; count++) {
+		r0 = bitRead(count,0);     
+		r1 = bitRead(count,1);
+		r2 = bitRead(count,2);   
+		digitalWrite(_s0, r0);
+		digitalWrite(_s1, r1);
+		digitalWrite(_s2, r2);
+		int read = analogRead(_analog);
+		if (value[count] < read - tolerance || value[count] > read + tolerance) {
+			value[count] = read;
+			_valueChangeCallback(count, read);
+		}
+	}  	
+}
+

source/library/input_4051/input_4061.h

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+/*
+  input_4051.h - Library for reading inputs from 4051 multiplexer
+  Created by David A. Mellis, November 2, 2007.
+  Released into the public domain.
+*/
+#ifndef input_4051_h
+#define input_4051_h
+
+#include "Arduino.h"
+
+
+class input_4051
+{
+	public:
+		Morse(int analogPin, int s0Pin, int s1Pin, int s2Pin, void (*valueChangeCallback(int,int)));
+		void loop(void);
+		int getSpecificValue(int pin);
+	private:
+		int _analog;
+		int _s0;
+		int _s1;
+		int _s2;
+		void (*_valueChangeCallback(int,int);
+		int _value[8];
+};
+
+
+#endif