diff --git a/IODevice.h b/IODevice.h
index f3ffb17..72beb9e 100644
--- a/IODevice.h
+++ b/IODevice.h
@@ -408,5 +408,7 @@ private:
 #include "IO_MCP23017.h"
 #include "IO_PCF8574.h"
 #include "IO_duinoNodes.h"
+#include "IO_EXIOExpander.h"
+
 
 #endif // iodevice_h
diff --git a/IO_EXIOExpander.h b/IO_EXIOExpander.h
new file mode 100644
index 0000000..151a319
--- /dev/null
+++ b/IO_EXIOExpander.h
@@ -0,0 +1,183 @@
+/*
+ *  © 2021, Peter Cole. All rights reserved.
+ *
+ *  This file is part of EX-CommandStation
+ *
+ *  This is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  It 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 General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with CommandStation.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+/*
+* The IO_EXIOExpander.h device driver integrates with one or more EX-IOExpander devices.
+* This device driver will configure the device on startup, along with
+* interacting with the device for all input/output duties.
+*
+* To create EX-IOExpander devices, these are defined in myHal.cpp:
+* (Note the device driver is included by default)
+*
+* void halSetup() {
+*   // EXIOExpander::create(vpin, num_vpins, i2c_address, digitalPinCount, analoguePinCount);
+*   EXIOExpander::create(800, 18, 0x65, 12, 8);
+* }
+* 
+* Note when defining the number of digital and analogue pins, there is no way to sanity check
+* this from the device driver, and it is up to the user to define the correct values here.
+*
+* All pins available on the EX-IOExpander device must be accounted for.
+* 
+* Vpins are allocated to digital pins first, and then analogue pins, so digital pins will
+* populate the first part of the specified vpin range, with the analogue pins populating the
+* last part of the vpin range.
+* Eg. for a default Nano, 800 - 811 are digital (D2 - D13), 812 to 817 are analogue (A0 - A3, A6/A7).
+*/
+
+#ifndef IO_EX_IOEXPANDER_H
+#define IO_EX_IOEXPANDER_H
+
+#include "I2CManager.h"
+#include "DIAG.h"
+#include "FSH.h"
+
+/////////////////////////////////////////////////////////////////////////////////////////////////////
+/*
+ * IODevice subclass for EX-IOExpander.
+ */
+class EXIOExpander : public IODevice {
+public:
+  static void create(VPIN vpin, int nPins, uint8_t i2cAddress, int numDigitalPins, int numAnaloguePins) {
+    if (checkNoOverlap(vpin, nPins, i2cAddress)) new EXIOExpander(vpin, nPins, i2cAddress, numDigitalPins, numAnaloguePins);
+  }
+
+private:  
+  // Constructor
+  EXIOExpander(VPIN firstVpin, int nPins, uint8_t i2cAddress, int numDigitalPins, int numAnaloguePins) {
+    _firstVpin = firstVpin;
+    _nPins = nPins;
+    _i2cAddress = i2cAddress;
+    _numDigitalPins = numDigitalPins;
+    _numAnaloguePins = numAnaloguePins;
+    int _dPinArrayLen = (_numDigitalPins + 7) / 8;
+    addDevice(this);
+  }
+
+  void _begin() {
+    // Initialise EX-IOExander device
+    uint8_t _check = I2CManager.checkAddress(_i2cAddress);
+    if (I2CManager.exists(_i2cAddress)) {
+      _digitalOutBuffer[0] = EXIOINIT;
+      _digitalOutBuffer[1] = _numDigitalPins;
+      _digitalOutBuffer[2] = _numAnaloguePins;
+      // Send config, if EXIORDY returned, we're good, otherwise go offline
+      I2CManager.read(_i2cAddress, _digitalInBuffer, 1, _digitalOutBuffer, 3, &_i2crb);
+      if (_digitalInBuffer[0] != EXIORDY) {
+        DIAG(F("ERROR configuring EX-IOExpander device, I2C:x%x"), _i2cAddress);
+        _deviceState = DEVSTATE_FAILED;
+        return;
+      }
+      // Attempt to get version, if we don't get it, we don't care, don't go offline
+      // Using digital in buffer in reverse to save RAM
+      _digitalInBuffer[0] = EXIOVER;
+      I2CManager.read(_i2cAddress, _versionBuffer, 3, _digitalInBuffer, 1, &_i2crb);
+      _majorVer = _versionBuffer[0];
+      _minorVer = _versionBuffer[1];
+      _patchVer = _versionBuffer[2];
+#ifdef DIAG_IO
+      _display();
+#endif
+    } else {
+      DIAG(F("EX-IOExpander device not found, I2C:x%x"), _i2cAddress);
+      _deviceState = DEVSTATE_FAILED;
+    }
+  }
+
+  bool _configure(VPIN vpin, ConfigTypeEnum configType, int paramCount, int params[]) override {
+    if (configType != CONFIGURE_INPUT) return false;
+    if (paramCount != 1) return false;
+    bool pullup = params[0];
+    int pin = vpin - _firstVpin;
+    uint8_t mask = 1 << ((pin-_firstVpin) % 8);
+    _digitalOutBuffer[0] = EXIODPUP;
+    _digitalOutBuffer[1] = pin;
+    _digitalOutBuffer[2] = pullup;
+    I2CManager.write(_i2cAddress, _digitalOutBuffer, 3, &_i2crb);
+    return true;
+  }
+
+  int _readAnalogue(VPIN vpin) override {
+    int pin = vpin - _firstVpin;
+    _analogueOutBuffer[0] = EXIORDAN;
+    _analogueOutBuffer[1] = pin;
+    I2CManager.read(_i2cAddress, _analogueInBuffer, 2, _analogueOutBuffer, 2, &_i2crb);
+    return (_analogueInBuffer[1] << 8) + _analogueInBuffer[0];
+  }
+
+  int _read(VPIN vpin) override {
+    int pin = vpin - _firstVpin;
+    _digitalOutBuffer[0] = EXIORDD;
+    _digitalOutBuffer[1] = pin;
+    _digitalOutBuffer[2] = 0x00;  // Don't need to use this for reading
+    I2CManager.read(_i2cAddress, _digitalInBuffer, 1, _digitalOutBuffer, 3, &_i2crb);
+    return _digitalInBuffer[0];
+  }
+
+  void _write(VPIN vpin, int value) override {
+    int pin = vpin - _firstVpin;
+    _digitalOutBuffer[0] = EXIOWRD;
+    _digitalOutBuffer[1] = pin;
+    _digitalOutBuffer[2] = value;
+    I2CManager.write(_i2cAddress, _digitalOutBuffer, 3, &_i2crb);
+  }
+
+  void _display() override {
+    int _firstAnalogue, _lastAnalogue;
+    if (_numAnaloguePins == 0) {
+      _firstAnalogue = 0;
+      _lastAnalogue = 0;
+    } else {
+      _firstAnalogue = _firstVpin + _numDigitalPins;
+      _lastAnalogue = _firstVpin + _nPins - 1;
+    }
+    DIAG(F("EX-IOExpander I2C:x%x v%d.%d.%d: %d Digital Vpins %d-%d, %d Analogue Vpins %d-%d %S"),
+              _i2cAddress, _majorVer, _minorVer, _patchVer,
+              _numDigitalPins, _firstVpin, _firstVpin + _numDigitalPins - 1,
+              _numAnaloguePins, _firstAnalogue, _lastAnalogue,
+              _deviceState == DEVSTATE_FAILED ? F("OFFLINE") : F(""));
+  }
+
+  uint8_t _i2cAddress;
+  uint8_t _numDigitalPins;
+  uint8_t _numAnaloguePins;
+  int _digitalPinBytes;
+  int _analoguePinBytes;
+  byte _analogueInBuffer[2];
+  byte _analogueOutBuffer[2];
+  byte _digitalOutBuffer[3];
+  byte _digitalInBuffer[1];
+  uint8_t _versionBuffer[3];
+  uint8_t _majorVer = 0;
+  uint8_t _minorVer = 0;
+  uint8_t _patchVer = 0;
+  I2CRB _i2crb;
+
+  enum {
+    EXIOINIT = 0xE0,    // Flag to initialise setup procedure
+    EXIORDY = 0xE1,     // Flag we have completed setup procedure, also for EX-IO to ACK setup
+    EXIODPUP = 0xE2,    // Flag we're sending digital pin pullup configuration
+    EXIOVER = 0xE3,     // Flag to get version
+    EXIORDAN = 0xE4,    // Flag to read an analogue input
+    EXIOWRD = 0xE5,     // Flag for digital write
+    EXIORDD = 0xE6,     // Flag to read digital input
+  };
+};
+
+#endif
\ No newline at end of file
diff --git a/myHal.cpp_example.txt b/myHal.cpp_example.txt
index 32aa12e..c95aaed 100644
--- a/myHal.cpp_example.txt
+++ b/myHal.cpp_example.txt
@@ -20,6 +20,7 @@
 #include "IO_HCSR04.h"    // Ultrasonic range sensor
 #include "IO_VL53L0X.h"   // Laser time-of-flight sensor
 #include "IO_DFPlayer.h"  // MP3 sound player
+//#include "IO_EXTurntable.h"   // Turntable-EX turntable controller
 
 
 //==========================================================================
@@ -160,6 +161,39 @@ void halSetup() {
   // DFPlayer::create(10000, 10, Serial1);
 
 
+  //=======================================================================
+  // The following directive defines an EX-Turntable turntable instance.
+  //=======================================================================
+  // EXTurntable::create(VPIN, Number of VPINs, I2C Address)
+  //
+  // The parameters are:
+  //   VPIN=600
+  //   Number of VPINs=1 (Note there is no reason to change this)
+  //   I2C address=0x60
+  //
+  // Note that the I2C address is defined in the EX-Turntable code, and 0x60 is the default.
+
+  //EXTurntable::create(600, 1, 0x60);
+
+
+  //=======================================================================
+  // The following directive defines an EX-IOExpander instance.
+  //=======================================================================
+  // EXIOExpander::create(VPIN, Number of VPINs, I2C Address, Digital pin count, Analogue pin count)
+  //
+  // The parameters are:
+  //   VPIN=an available Vpin
+  //   Number of VPINs=Digital pin count + Analogue pin count (must match device in use as per documentation)
+  //   I2C address=an available I2C address (default 0x65)
+  //
+  // Note that the I2C address is defined in the EX-IOExpander code, and 0x65 is the default.
+  // The first example is for an Arduino Nano with the default pin allocations.
+  // The second example is for an Arduino Uno using all pins as digital only.
+
+  //EXIOExpander::create(800, 18, 0x65, 12, 8);
+  //EXIOExpander::create(820, 16, 0x66, 16, 0);
+
+
 }
 
 #endif