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diff --git a/libraries/Esplora/Esplora.cpp b/libraries/Esplora/Esplora.cpp
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+++ b/libraries/Esplora/Esplora.cpp
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+/*
+  Esplora.cpp - Arduino Esplora board library
+  Written by Enrico Gueli
+  Copyright (c) 2012 Arduino(TM)  All right reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+
+#include "Esplora.h"
+
+_Esplora Esplora;
+
+/*
+ * The following constants tell, for each accelerometer
+ * axis, which values are returned when the axis measures
+ * zero acceleration.
+ */
+const int ACCEL_ZERO_X = 320;
+const int ACCEL_ZERO_Y = 330;
+const int ACCEL_ZERO_Z = 310;
+
+const byte MUX_ADDR_PINS[] = { A0, A1, A2, A3 };
+const byte MUX_COM_PIN = A4;
+
+const int JOYSTICK_DEAD_ZONE = 100;
+
+const byte RED_PIN    = 5;
+const byte BLUE_PIN   = 9;
+const byte GREEN_PIN  = 10;
+
+const byte BUZZER_PIN = 6;
+
+// non-multiplexer Esplora pins: 
+// Accelerometer: x-A5, y-A7, z-A6
+// External outputs: D3, D11
+// Buzzer: A8
+// RGB Led: red-D5, green-D10/A11, blue-D9/A10
+// Led 13: D13
+
+const byte ACCEL_X_PIN = A5;
+const byte ACCEL_Y_PIN = A11;
+const byte ACCEL_Z_PIN = A6;
+
+const byte LED_PIN     = 13;
+
+_Esplora::_Esplora() {
+  for (byte p=0; p<4; p++) {
+    pinMode(MUX_ADDR_PINS[p], OUTPUT);
+  }
+  pinMode(RED_PIN, OUTPUT);
+  pinMode(GREEN_PIN, OUTPUT);
+  pinMode(BLUE_PIN, OUTPUT);
+}
+
+unsigned int _Esplora::readChannel(byte channel) {
+  digitalWrite(MUX_ADDR_PINS[0], (channel & 1) ? HIGH : LOW);
+  digitalWrite(MUX_ADDR_PINS[1], (channel & 2) ? HIGH : LOW);
+  digitalWrite(MUX_ADDR_PINS[2], (channel & 4) ? HIGH : LOW);
+  digitalWrite(MUX_ADDR_PINS[3], (channel & 8) ? HIGH : LOW);
+  // workaround to cope with lack of pullup resistor on joystick switch
+  if (channel == CH_JOYSTICK_SW) {
+    pinMode(MUX_COM_PIN, INPUT_PULLUP); 
+    unsigned int joystickSwitchState = (digitalRead(MUX_COM_PIN) == HIGH) ? 1023 : 0;
+    digitalWrite(MUX_COM_PIN, LOW);
+    return joystickSwitchState;
+  }
+  else
+    return analogRead(MUX_COM_PIN);
+}
+
+boolean _Esplora::joyLowHalf(byte joyCh) {
+  return (readChannel(joyCh) < 512 - JOYSTICK_DEAD_ZONE)
+    ? LOW : HIGH;
+}
+
+boolean _Esplora::joyHighHalf(byte joyCh) {
+  return (readChannel(joyCh) > 512 + JOYSTICK_DEAD_ZONE)
+    ? LOW : HIGH;
+}
+
+boolean _Esplora::readButton(byte ch) {
+  if (ch >= SWITCH_1 && ch <= SWITCH_4) {
+    ch--;
+  }
+  
+  switch(ch) {
+  case JOYSTICK_RIGHT:
+    return joyLowHalf(CH_JOYSTICK_X);
+  case JOYSTICK_LEFT:
+    return joyHighHalf(CH_JOYSTICK_X);
+  case JOYSTICK_UP:
+    return joyLowHalf(CH_JOYSTICK_Y);
+  case JOYSTICK_DOWN:
+    return joyHighHalf(CH_JOYSTICK_Y);
+  }
+    
+  unsigned int val = readChannel(ch);
+  return (val > 512) ? HIGH : LOW;
+}
+
+void _Esplora::writeRGB(byte r, byte g, byte b) {
+  writeRed(r);
+  writeGreen(g);
+  writeBlue(b);
+}
+
+#define RGB_FUNC(name, pin, lastVar) \
+void _Esplora::write##name(byte val) { \
+  if (val == lastVar) \
+    return; \
+  analogWrite(pin, val);  \
+  lastVar = val; \
+  delay(5); \
+} \
+\
+byte _Esplora::read##name() { \
+  return lastVar; \
+}
+  
+RGB_FUNC(Red,   RED_PIN,   lastRed)
+RGB_FUNC(Green, GREEN_PIN, lastGreen)
+RGB_FUNC(Blue,  BLUE_PIN,  lastBlue)
+
+void _Esplora::tone(unsigned int freq) {
+  if (freq > 0)
+    ::tone(BUZZER_PIN, freq);
+  else
+    ::noTone(BUZZER_PIN);
+}
+
+void _Esplora::tone(unsigned int freq, unsigned long duration) {
+  if (freq > 0)
+    ::tone(BUZZER_PIN, freq, duration);
+  else
+    ::noTone(BUZZER_PIN);
+}
+
+void _Esplora::noTone() {
+  ::noTone(BUZZER_PIN);
+}
+
+int _Esplora::readTemperature(const byte scale) {
+  long rawT = readChannel(CH_TEMPERATURE);
+  if (scale == DEGREES_C) {
+    return (int)((rawT * 500 / 1024) - 50);
+  }
+  else if (scale == DEGREES_F) {
+    return (int)((rawT * 450 / 512 ) - 58);
+  }
+  else {
+    return readTemperature(DEGREES_C);
+  }
+}
+
+int _Esplora::readAccelerometer(const byte axis) {
+  switch (axis) {
+    case X_AXIS: return analogRead(ACCEL_X_PIN) - ACCEL_ZERO_X;
+    case Y_AXIS: return analogRead(ACCEL_Y_PIN) - ACCEL_ZERO_Y;
+    case Z_AXIS: return analogRead(ACCEL_Z_PIN) - ACCEL_ZERO_Z;
+    default: return 0;
+  }
+}