diff --git a/examples/knx-demo-smal-go/knx-demo.ino b/examples/knx-demo-smal-go/knx-demo.ino
new file mode 100644
index 0000000..52fb386
--- /dev/null
+++ b/examples/knx-demo-smal-go/knx-demo.ino
@@ -0,0 +1,129 @@
+#include <knx.h>
+
+#ifdef ARDUINO_ARCH_ESP8266
+#include <WiFiManager.h>
+#endif
+
+/*****************************************
+ * changes necessary for SMALL_GROUPOBJECT
+ * are commented with //** 
+ * This project can be used with any
+ * of the knxprod files of the original
+ * knx-demo project.
+ *****************************************/
+
+// create named references for easy access to group objects
+#define goCurrent knx.getGroupObject(1)
+#define goMax knx.getGroupObject(2)
+#define goMin knx.getGroupObject(3)
+#define goReset knx.getGroupObject(4)
+
+float currentValue = 0;
+float maxValue = 0;
+float minValue = RAND_MAX;
+long lastsend = 0;
+
+void measureTemp()
+{
+    long now = millis();
+    if ((now - lastsend) < 2000)
+        return;
+
+    lastsend = now;
+    int r = rand();
+    currentValue = (r * 1.0) / (RAND_MAX * 1.0);
+    currentValue *= 100 * 100;
+
+    // write new value to groupobject
+    goCurrent.value(currentValue, DPT_Value_Temp); //** each value access needs to done with according DPT parameter
+
+    if (currentValue > maxValue)
+    {
+        maxValue = currentValue;
+        goMax.value(maxValue, DPT_Value_Temp); //** each value access needs to done with according DPT parameter
+    }
+
+    if (currentValue < minValue)
+    {
+        minValue = currentValue;
+        goMin.value(minValue, DPT_Value_Temp); //** each value access needs to done with according DPT parameter
+    }
+}
+
+// callback from reset-GO
+void resetCallback(GroupObject& go)
+{
+    //** callbacks are now handled in the class, not per instance,
+    //** this means, we have to check, which GroupObject is calling back
+    if (go.asap() == goReset.asap())
+    {
+        if (go.value(DPT_Trigger)) //** each value access needs to done with according DPT parameter
+        {
+            maxValue = 0;
+            minValue = 10000;
+        }
+    }
+}
+
+void setup()
+{
+    Serial.begin(115200);
+    ArduinoPlatform::SerialDebug = &Serial;
+
+    randomSeed(millis());
+
+#ifdef ARDUINO_ARCH_ESP8266
+    WiFiManager wifiManager;
+    wifiManager.autoConnect("knx-demo");
+#endif
+
+    // read adress table, association table, groupobject table and parameters from eeprom
+    knx.readMemory();
+
+    // print values of parameters if device is already configured
+    if (knx.configured())
+    {
+        // register callback for reset GO
+        GroupObject::classCallback(resetCallback); //** callbacks are now handled per class, not per instance
+        //** there is no global assignment of DPT for GroupObjects
+        // goReset.dataPointType(DPT_Trigger);
+        // goCurrent.dataPointType(DPT_Value_Temp);
+        // goMin.dataPointType(DPT_Value_Temp);
+        // goMax.dataPointType(DPT_Value_Temp);
+
+        Serial.print("Timeout: ");
+        Serial.println(knx.paramByte(0));
+        Serial.print("Zykl. senden: ");
+        Serial.println(knx.paramByte(1));
+        Serial.print("Min/Max senden: ");
+        Serial.println(knx.paramByte(2));
+        Serial.print("Aenderung senden: ");
+        Serial.println(knx.paramByte(3));
+        Serial.print("Abgleich: ");
+        Serial.println(knx.paramByte(4));
+    }
+
+    // pin or GPIO the programming led is connected to. Default is LED_BUILTIN
+    // knx.ledPin(LED_BUILTIN);
+    // is the led active on HIGH or low? Default is LOW
+    // knx.ledPinActiveOn(HIGH);
+    // pin or GPIO programming button is connected to. Default is 0
+    // knx.buttonPin(0);
+    // Is the interrup created in RISING or FALLING signal? Default is RISING
+    // knx.buttonPinInterruptOn(FALLING);
+
+    // start the framework.
+    knx.start();
+}
+
+void loop()
+{
+    // don't delay here to much. Otherwise you might lose packages or mess up the timing with ETS
+    knx.loop();
+
+    // only run the application code if the device was configured with ETS
+    if (!knx.configured())
+        return;
+
+    measureTemp();
+}
\ No newline at end of file
diff --git a/examples/knx-demo-smal-go/platformio.ini b/examples/knx-demo-smal-go/platformio.ini
new file mode 100644
index 0000000..a919602
--- /dev/null
+++ b/examples/knx-demo-smal-go/platformio.ini
@@ -0,0 +1,120 @@
+;PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+[platformio]
+; We have to keep libdeps dir out the project directory otherwise,
+; library scanner seems to have issues so compilation fails
+libdeps_dir = /tmp/libdeps
+src_dir = .
+
+;--- SAMD --------------------------------------------------
+; SMALL_GROUPOBJECT just tested with TP on SAMD, but should work also in other environments
+[env:zeroUSB]
+platform = atmelsam
+board = zeroUSB
+framework = arduino
+; We consider that the this projects is opened within its project directory
+; while working with VS Code.
+lib_extra_dirs = ../../../
+
+lib_deps =
+  SPI
+  https://github.com/thelsing/FlashStorage.git
+  knx
+
+build_flags =
+  -DMASK_VERSION=0x07B0
+  -DSMALL_GROUPOBJECT
+  -Wno-unknown-pragmas
+
+; [env:adafruit_feather_m0_rf]
+; platform = atmelsam
+; board = adafruit_feather_m0
+; framework = arduino
+; ; We consider that the this projects is opened within its project directory
+; ; while working with VS Code.
+; lib_extra_dirs = ../../../
+
+; lib_deps =
+;   SPI
+;   https://github.com/thelsing/FlashStorage.git
+;   knx
+
+; build_flags =
+;   -DMASK_VERSION=0x27B0
+;   -Wno-unknown-pragmas
+;-----------------------------------------------------------
+
+
+;--- ESP8266 -----------------------------------------------
+#[env:nodemcuv2_ip]
+#platform = espressif8266
+#board = nodemcuv2
+#framework = arduino
+; We consider that the this projects is opened within its project directory
+; while working with VS Code.
+#lib_extra_dirs = ../../../
+
+#lib_deps =
+#  WifiManager
+#  knx
+
+#build_flags =
+#  -DMASK_VERSION=0x57B0
+#  -Wno-unknown-pragmas
+
+; [env:nodemcuv2_tp]
+; platform = espressif8266
+; board = nodemcuv2
+; framework = arduino
+; ; We consider that the this projects is opened within its project directory
+; ; while working with VS Code.
+; lib_extra_dirs = ../../../
+
+; lib_deps =
+;   WifiManager
+;   knx
+
+; build_flags =
+;   -DMASK_VERSION=0x07B0
+;   -Wno-unknown-pragmas
+
+;---------------------------------------------------------
+
+
+;--- ESP32 -----------------------------------------------
+; [env:esp32dev_ip]
+; platform = espressif32
+; board = esp32dev
+; framework = arduino
+; ; We consider that the this projects is opened within its project directory
+; ; while working with VS Code.
+; lib_extra_dirs = ../../../
+
+; lib_deps =
+;   knx
+
+; build_flags =
+;   -DMASK_VERSION=0x57B0
+;   -Wno-unknown-pragmas
+
+; [env:esp32dev_tp]
+; platform = espressif32
+; board = esp32dev
+; framework = arduino
+; ; We consider that the this projects is opened within its project directory
+; ; while working with VS Code.
+; lib_extra_dirs = ../../../
+
+; lib_deps =
+;   knx
+
+; build_flags =
+;   -DMASK_VERSION=0x07B0
+;   -Wno-unknown-pragmas
diff --git a/src/knx/bau_systemB_device.cpp b/src/knx/bau_systemB_device.cpp
index 43d70f7..37289af 100644
--- a/src/knx/bau_systemB_device.cpp
+++ b/src/knx/bau_systemB_device.cpp
@@ -114,9 +114,13 @@ void BauSystemBDevice::updateGroupObject(GroupObject & go, uint8_t * data, uint8
     memcpy(goData, data, length);
 
     go.commFlag(Updated);
+#ifdef SMALL_GROUPOBJECT
+    GroupObject::processClassCallback(go);
+#else
     GroupObjectUpdatedHandler handler = go.callback();
     if (handler)
         handler(go);
+#endif
 }
 
 bool BauSystemBDevice::configured()
diff --git a/src/knx/config.h b/src/knx/config.h
index 0b3ce64..a042ae3 100644
--- a/src/knx/config.h
+++ b/src/knx/config.h
@@ -60,6 +60,12 @@
 // Define via a compiler -D flag if required
 // #define USE_DATASECURE
 
+// option to have GroupObjects (KO in German) use 8 bytes mangement information RAM instead of 19 bytes
+// see knx-demo-small-go for example
+// this option might be also set via compiler flag -DSMALL_GROUPOBJECT if required
+//#define SMALL_GROUPOBJECT
+
+
 #endif
 
 #if !defined(MASK_VERSION)
diff --git a/src/knx/group_object.cpp b/src/knx/group_object.cpp
index 2ed11d9..db92058 100644
--- a/src/knx/group_object.cpp
+++ b/src/knx/group_object.cpp
@@ -4,23 +4,30 @@
 #include "datapoint_types.h"
 #include "group_object_table_object.h"
 
+#ifdef SMALL_GROUPOBJECT
+GroupObjectUpdatedHandler GroupObject::_updateHandlerStatic = 0;
+#endif
+GroupObjectTableObject* GroupObject::_table = 0;
+
 GroupObject::GroupObject()
 {
     _data = 0;
     _commFlag = Ok;
-    _table = 0;
     _dataLength = 0;
+#ifndef SMALL_GROUPOBJECT
     _updateHandler = 0;
+#endif
 }
 
 GroupObject::GroupObject(const GroupObject& other)
 {
     _data = new uint8_t[other._dataLength];
     _commFlag = other._commFlag;
-    _table = other._table;
     _dataLength = other._dataLength;
     _asap = other._asap;
+#ifndef SMALL_GROUPOBJECT
     _updateHandler = other._updateHandler;
+#endif
     memcpy(_data, other._data, _dataLength);
 }
 
@@ -175,6 +182,24 @@ size_t GroupObject::sizeInTelegram()
     return asapValueSize(code);
 }
 
+#ifdef SMALL_GROUPOBJECT
+GroupObjectUpdatedHandler GroupObject::classCallback()
+{
+    return _updateHandlerStatic;
+}
+
+void GroupObject::classCallback(GroupObjectUpdatedHandler handler)
+{
+    _updateHandlerStatic = handler;
+}
+
+void GroupObject::processClassCallback(GroupObject& ko)
+{
+    if (_updateHandlerStatic != 0)
+        _updateHandlerStatic(ko);
+}
+
+#else
 void GroupObject::callback(GroupObjectUpdatedHandler handler)
 {
     _updateHandler = handler;
@@ -185,6 +210,7 @@ GroupObjectUpdatedHandler GroupObject::callback()
 {
     return _updateHandler;
 }
+#endif
 
 void GroupObject::value(const KNXValue& value, const Dpt& type)
 {
@@ -205,7 +231,7 @@ bool GroupObject::tryValue(KNXValue& value, const Dpt& type)
     return KNX_Decode_Value(_data, _dataLength, type, value);
 }
 
-
+#ifndef SMALL_GROUPOBJECT
 void GroupObject::dataPointType(Dpt value)
 {
     _datapointType = value;
@@ -240,7 +266,7 @@ void GroupObject::valueNoSend(const KNXValue& value)
 {
     valueNoSend(value, _datapointType);
 }
-
+#endif
 
 void GroupObject::valueNoSend(const KNXValue& value, const Dpt& type)
 {
diff --git a/src/knx/group_object.h b/src/knx/group_object.h
index 7fdf5e6..6a07b5f 100644
--- a/src/knx/group_object.h
+++ b/src/knx/group_object.h
@@ -133,6 +133,8 @@ class GroupObject
      * (in german "KO-Nr")
      */
     uint16_t asap();
+
+#ifndef SMALL_GROUPOBJECT
     /**
      * register a callback for this group object. The registered callback will be called if the group object was changed from the bus.
      */
@@ -141,16 +143,12 @@ class GroupObject
      * returns the registered callback
      */
     GroupObjectUpdatedHandler callback();
+#endif
     /**
      * return the current value of the group object.
      * @param type the datapoint type used for the conversion. If this doesn't fit to the group object the returned value is invalid.
      */
     KNXValue value(const Dpt& type);
-    /**
-     * return the current value of the group object. The datapoint type must be set with dataPointType(). Otherwise the returned
-     * value is invalid.
-     */
-    KNXValue value();
     /**
      * set the current value of the group object and changes the state of the group object to ::WriteRequest.
      * @param value the value the group object is set to
@@ -159,13 +157,6 @@ class GroupObject
      * The parameters must fit the group object. Otherwise it will stay unchanged.
      */
     void value(const KNXValue& value, const Dpt& type);
-    /**
-     * set the current value of the group object and changes the state of the group object to ::WriteRequest.
-     * @param value the value the group object is set to
-     * 
-     * The parameters must fit the group object and dhe datapoint type must be set with dataPointType(). Otherwise it will stay unchanged.
-     */
-    void value(const KNXValue& value);
     /**
      * set the current value of the group object.
      * @param value the value the group object is set to
@@ -174,13 +165,6 @@ class GroupObject
      * The parameters must fit the group object. Otherwise it will stay unchanged.
      */
     void valueNoSend(const KNXValue& value, const Dpt& type);
-    /**
-     * set the current value of the group object.
-     * @param value the value the group object is set to
-     * 
-     * The parameters must fit the group object and dhe datapoint type must be set with dataPointType(). Otherwise it will stay unchanged.
-     */
-    void valueNoSend(const KNXValue& value);
     /**
      * set the current value of the group object.
      * @param value the value the group object is set to
@@ -191,6 +175,27 @@ class GroupObject
      * @returns true if the value of the group object was changed successfully.
      */
     bool tryValue(KNXValue& value, const Dpt& type);
+
+#ifndef SMALL_GROUPOBJECT
+    /**
+     * return the current value of the group object. The datapoint type must be set with dataPointType(). Otherwise the returned
+     * value is invalid.
+     */
+    KNXValue value();
+    /**
+     * set the current value of the group object and changes the state of the group object to ::WriteRequest.
+     * @param value the value the group object is set to
+     * 
+     * The parameters must fit the group object and dhe datapoint type must be set with dataPointType(). Otherwise it will stay unchanged.
+     */
+    void value(const KNXValue& value);
+    /**
+     * set the current value of the group object.
+     * @param value the value the group object is set to
+     * 
+     * The parameters must fit the group object and dhe datapoint type must be set with dataPointType(). Otherwise it will stay unchanged.
+     */
+    void valueNoSend(const KNXValue& value);
     /**
      * set the current value of the group object.
      * @param value the value the group object is set to
@@ -209,15 +214,32 @@ class GroupObject
      * sets the datapoint type of the group object.
      */
     void dataPointType(Dpt value);
+#else
+    /**
+     * Alternative callback processing: register one global callback for all group object. 
+     * The registered callback will be called if any group object was changed from the bus.
+     * The callback method has to dispatch to the correct handler for this group object.
+     */
+    static GroupObjectUpdatedHandler classCallback();
+    static void classCallback(GroupObjectUpdatedHandler handler);
+    static void processClassCallback(GroupObject& ko);
+#endif
 
   private:
+    // class members
+    static GroupObjectTableObject* _table;
+#ifdef SMALL_GROUPOBJECT
+    static GroupObjectUpdatedHandler _updateHandlerStatic;
+#endif
+
     size_t asapValueSize(uint8_t code);
-    GroupObjectUpdatedHandler _updateHandler;
     size_t goSize();
     uint16_t _asap = 0;
     ComFlag _commFlag = Ok;
     uint8_t* _data = 0;
     uint8_t _dataLength = 0;
-    GroupObjectTableObject* _table = 0;
+#ifndef SMALL_GROUPOBJECT
+    GroupObjectUpdatedHandler _updateHandler;
     Dpt _datapointType;
+#endif
 };