diff --git a/CustomDevices b/CustomDevices
new file mode 100644
index 00000000..e69de29b
diff --git a/src/CommandMessenger.cpp b/src/CommandMessenger.cpp
index 7015fefe..19bdd3b0 100644
--- a/src/CommandMessenger.cpp
+++ b/src/CommandMessenger.cpp
@@ -54,6 +54,7 @@ void attachCommandCallbacks()
     cmdMessenger.attach(kInitModule, LedSegment::OnInitModule);
     cmdMessenger.attach(kSetModule, LedSegment::OnSetModule);
     cmdMessenger.attach(kSetModuleBrightness, LedSegment::OnSetModuleBrightness);
+    cmdMessenger.attach(kSetModuleSingleSegment, LedSegment::OnSetModuleSingleSegment);
 #endif
 
     cmdMessenger.attach(kSetPin, Output::OnSet);
diff --git a/src/MF_Segment/LedControl_dual.cpp b/src/MF_Segment/LedControl_dual.cpp
index 31ffb64e..269f5110 100644
--- a/src/MF_Segment/LedControl_dual.cpp
+++ b/src/MF_Segment/LedControl_dual.cpp
@@ -5,6 +5,7 @@
 //
 
 #include "LedControl_dual.h"
+#include "allocateMem.h"
 
 // Segments to be switched on for characters and digits on 7-Segment Displays
 // bit/segment sequence: dABCDEFG
@@ -73,7 +74,7 @@ enum {
 };
 
 #ifdef LEDCONTROL_NO_BUF
-uint8_t LedControl::rawdata[16] = {0};
+uint8_t *LedControl::rawdata;
 #endif
 
 // =======================================================================
@@ -132,15 +133,24 @@ uint8_t LedControl::rawdata[16] = {0};
 // Digit sequence map for 6 digit displays
 const uint8_t digitmap[] = {2, 1, 0, 5, 4, 3};
 
-void LedControl::begin(uint8_t type, uint8_t dataPin, uint8_t clkPin, uint8_t csPin, uint8_t numDevices)
+bool LedControl::begin(uint8_t type, uint8_t dataPin, uint8_t clkPin, uint8_t csPin, uint8_t numDevices)
 {
     _type    = type;
     _dataPin = dataPin;
     _clkPin  = clkPin;
     _csPin   = csPin;
 
+    if (!FitInMemory(sizeof(uint8_t) * numDevices * 2))
+        return false;
+    rawdata = new (allocateMemory(sizeof(uint8_t) * numDevices * 2)) uint8_t;
+
     if (isMAX()) {
-        if ((numDevices - 1) > 7) numDevices = 8;
+        // make sure we have max 8 chips in the daisy chain
+        if (numDevices > 8) numDevices = 8;
+
+        if (!FitInMemory(sizeof(uint8_t) * numDevices * 8))
+            return false;
+        digitBuffer = new (allocateMemory(sizeof(uint8_t) * numDevices * 8)) uint8_t;
         maxUnits = numDevices;
         pinMode(_dataPin, OUTPUT);
         pinMode(_clkPin, OUTPUT);
@@ -165,6 +175,8 @@ void LedControl::begin(uint8_t type, uint8_t dataPin, uint8_t clkPin, uint8_t cs
         brightness = MAX_BRIGHTNESS;
         shutdown(0, true);
     }
+
+    return true;
 }
 
 void LedControl::shutdown(uint8_t addr, bool b)
@@ -238,13 +250,48 @@ void LedControl::setChar(uint8_t addr, uint8_t digit, char value, bool dp, bool
     setPattern(addr, digit, v, sendNow);
 }
 
+void LedControl::setSingleSegment(uint8_t subModule, uint8_t segment, uint8_t value, bool sendNow)
+{
+    uint8_t digit = segment >> 3;
+    uint8_t bitPosition = segment % 8;
+    uint8_t offset = subModule * 8;
+
+    if (isMAX()) {
+        if (subModule >= maxUnits) return;
+        if (segment > 63) return;
+        if (value) {
+            digitBuffer[offset + digit] |= (1 << bitPosition);   
+        } else {
+            digitBuffer[offset + digit] &= ~(1 << bitPosition);
+        }
+        spiTransfer(subModule, digit + 1, digitBuffer[offset + digit]);
+    } else {
+        if (subModule >= maxUnits) return;
+        if (segment >= maxUnits * 8) return;
+        // Same order as MAX72XX
+        // MAX72XX order is:      dABCDEFG
+        // TM1637 order required: ABCDEFGd
+        bitPosition++;
+        if (bitPosition == 8)
+            bitPosition = 0;
+        if (value) {
+            rawdata[(maxUnits - 1) - digit] |= (1 << bitPosition);   
+        } else {
+            rawdata[(maxUnits - 1) - digit] &= ~(1 << bitPosition);
+        }
+        if (sendNow) writeDigits(digit, 1);
+    }
+}
+
 void LedControl::setPattern(uint8_t addr, uint8_t digit, uint8_t value, bool sendNow)
 {
     if (digit > getDigitCount() - 1) return;
     uint8_t v;
     v = pgm_read_byte_near(charTable + (value & 0x7F));
     if (isMAX()) {
+        uint8_t offset = addr * 8;
         if (value & 0x80) v |= 0x80;
+        digitBuffer[offset + digit] = v;
         spiTransfer(addr, digit + 1, v); // Always send immediately for MAX
     } else {
         // Original data for MAX has the bit sequence: dABCDEFG
diff --git a/src/MF_Segment/LedControl_dual.h b/src/MF_Segment/LedControl_dual.h
index 634dd1b4..4f9734e9 100644
--- a/src/MF_Segment/LedControl_dual.h
+++ b/src/MF_Segment/LedControl_dual.h
@@ -66,15 +66,13 @@ class LedControl
     uint8_t _dataPin = TYPE_UNDEFINED;
     uint8_t _clkPin  = TYPE_UNDEFINED;
     uint8_t _csPin   = TYPE_UNDEFINED;
-    // MAX: Number of chained units
-    // TM:  Number of digits (4 or 6)
 #ifdef LEDCONTROL_NO_BUF
     // For TM, buffer can't be static (= shared): either we are building
     // the extended version (which adds a per-unit buffer instead of the static one)
     // or we are forced to resort to digit-by-digit output
-    static uint8_t rawdata[16];
+    static uint8_t *rawdata;
 #else
-    uint8_t rawdata[16];
+    uint8_t *rawdata;
 #endif
 
     uint8_t maxUnits   = 0; // MAX: N. of chained units; TM: N. of digits
@@ -82,6 +80,7 @@ class LedControl
     void    setPattern(uint8_t addr, uint8_t digit, uint8_t value, bool sendNow = true);
 
     // MAX-specific
+    uint8_t *digitBuffer;   // each digit must be stored in a buffer to be able to set single segments
     void setScanLimit(uint8_t addr, uint8_t limit);
     void spiTransfer(uint8_t addr, uint8_t opcode, uint8_t data);
 
@@ -103,7 +102,7 @@ class LedControl
 public:
     LedControl(){};
 
-    void begin(uint8_t type, uint8_t dataPin, uint8_t clkPin, uint8_t csPin, uint8_t numDevices = 1);
+    bool begin(uint8_t type, uint8_t dataPin, uint8_t clkPin, uint8_t csPin, uint8_t numDevices = 1);
 
     bool    isMAX(void) { return _type == LedSegment::TYPE_MAX72XX; }
     uint8_t getDeviceCount(void) { return (isMAX() ? maxUnits : 1); };
@@ -139,6 +138,16 @@ class LedControl
     //          Ignored for MAX, or if LEDCONTROL_NO_BUF is defined.
     void setChar(uint8_t addr, uint8_t digit, char value, bool dp = false, bool sendNow = true);
 
+    // Display a Single Segment.
+    // Params:
+    // addr	    address of the display (ignored for TM)
+    // segment	the segment to be set or unset
+    // value	set or unset the Segment
+    // sendnow  If false, buffers chars rather than sending them immediately (TM only;
+    //          requires a sendAll() afterwards).
+    //          Ignored for MAX, or if LEDCONTROL_NO_BUF is defined.
+    void setSingleSegment(uint8_t addr, uint8_t segment, uint8_t value, bool sendNow = true);
+
 #ifndef LEDCONTROL_NO_BUF
     // Sends the whole (previously filled) buffer content.
     void sendAll(void) { writeBuffer(); };
diff --git a/src/MF_Segment/LedSegment.cpp b/src/MF_Segment/LedSegment.cpp
index fa2c7c3b..00715997 100644
--- a/src/MF_Segment/LedSegment.cpp
+++ b/src/MF_Segment/LedSegment.cpp
@@ -27,8 +27,15 @@ namespace LedSegment
     {
         if (ledSegmentsRegistered == ledSegmentsRegistereds)
             return;
+
         ledSegments[ledSegmentsRegistered] = MFSegments();
-        ledSegments[ledSegmentsRegistered].attach(type, dataPin, csPin, clkPin, numDevices, brightness);
+
+        if (!ledSegments[ledSegmentsRegistered].attach(type, dataPin, csPin, clkPin, numDevices, brightness))
+        {
+            cmdMessenger.sendCmd(kStatus, F("Led Segment array does not fit into Memory"));
+            return;
+        }
+
         ledSegmentsRegistered++;
 #ifdef DEBUG2CMDMESSENGER
         cmdMessenger.sendCmd(kDebug, F("Added Led Segment"));
@@ -78,6 +85,22 @@ namespace LedSegment
         int brightness = cmdMessenger.readInt16Arg();
         ledSegments[module].setBrightness(subModule, brightness);
     }
+
+    void OnSetModuleSingleSegment()
+    {
+        uint8_t module     = (uint8_t)cmdMessenger.readInt16Arg();
+        uint8_t subModule  = (uint8_t)cmdMessenger.readInt16Arg();
+        char *segment      = cmdMessenger.readStringArg();              // 0 to 63, multiple segments deliminited by '|'
+        uint8_t on_off     = (uint8_t)cmdMessenger.readInt16Arg();      // 0 or 1
+
+        char *pinTokens = strtok(segment, "|");
+        while (pinTokens != 0) {
+            uint8_t num = (uint8_t)atoi(pinTokens);
+            ledSegments[module].setSingleSegment(subModule, num, on_off);
+            pinTokens = strtok(0, "|");
+        }
+    }
+    
 } // namespace
 
 // LedSegment.cpp
diff --git a/src/MF_Segment/LedSegment.h b/src/MF_Segment/LedSegment.h
index b3af44b8..914ef0c6 100644
--- a/src/MF_Segment/LedSegment.h
+++ b/src/MF_Segment/LedSegment.h
@@ -22,6 +22,7 @@ namespace LedSegment
     void OnInitModule();
     void OnSetModule();
     void OnSetModuleBrightness();
+    void OnSetModuleSingleSegment();
 }
 
 // LedSegment.h
diff --git a/src/MF_Segment/MFSegments.cpp b/src/MF_Segment/MFSegments.cpp
index c9575e17..a3351465 100644
--- a/src/MF_Segment/MFSegments.cpp
+++ b/src/MF_Segment/MFSegments.cpp
@@ -5,6 +5,7 @@
 //
 
 #include "MFSegments.h"
+#include "commandmessenger.h"
 
 MFSegments::MFSegments()
 {
@@ -26,10 +27,20 @@ void MFSegments::display(uint8_t module, char *string, uint8_t points, uint8_t m
     }
 }
 
+void MFSegments::setSingleSegment(uint8_t module, uint8_t segment, uint8_t on_off)
+{
+    if (_moduleCount == 0)
+        return;
+    
+    _ledControl.setSingleSegment(module, segment, on_off);
+
+}
+
 void MFSegments::setBrightness(uint8_t module, uint8_t value)
 {
     if (_moduleCount == 0)
         return;
+
     if (module < _moduleCount) {
         if (value) {
             _ledControl.setIntensity(module, value - 1);
@@ -40,15 +51,20 @@ void MFSegments::setBrightness(uint8_t module, uint8_t value)
     }
 }
 
-void MFSegments::attach(uint8_t type, uint8_t dataPin, uint8_t csPin, uint8_t clkPin, uint8_t moduleCount, uint8_t brightness)
+bool MFSegments::attach(uint8_t type, uint8_t dataPin, uint8_t csPin, uint8_t clkPin, uint8_t moduleCount, uint8_t brightness)
 {
-    _ledControl.begin(type, dataPin, clkPin, csPin, moduleCount);
+    if (!_ledControl.begin(type, dataPin, clkPin, csPin, moduleCount))
+        return false;
+
     _moduleCount = moduleCount;
+
     for (uint8_t i = 0; i < _moduleCount; ++i) {
         setBrightness(i, brightness);
         _ledControl.shutdown(i, false);
         _ledControl.clearDisplay(i);
     }
+
+    return true;
 }
 
 void MFSegments::detach()
diff --git a/src/MF_Segment/MFSegments.h b/src/MF_Segment/MFSegments.h
index 81f4ca14..a33c5a47 100644
--- a/src/MF_Segment/MFSegments.h
+++ b/src/MF_Segment/MFSegments.h
@@ -14,11 +14,12 @@ class MFSegments
 public:
     MFSegments();
     void display(uint8_t module, char *string, uint8_t points, uint8_t mask, bool convertPoints = false);
-    void attach(uint8_t type, uint8_t dataPin, uint8_t csPin, uint8_t clkPin, uint8_t moduleCount, uint8_t brightness);
+    bool attach(uint8_t type, uint8_t dataPin, uint8_t csPin, uint8_t clkPin, uint8_t moduleCount, uint8_t brightness);
     void detach();
     void test();
     void powerSavingMode(bool state);
     void setBrightness(uint8_t module, uint8_t value);
+    void setSingleSegment(uint8_t module, uint8_t segment, uint8_t on_off);
 
 private:
     LedControl _ledControl;
diff --git a/src/commandmessenger.h b/src/commandmessenger.h
index eddfd1a3..19580b38 100644
--- a/src/commandmessenger.h
+++ b/src/commandmessenger.h
@@ -45,6 +45,7 @@ enum {
     kDigInMuxChange,       // 30
     kSetStepperSpeedAccel, // 31
     kSetCustomDevice,      // 32
+    kSetModuleSingleSegment, // 33
     kDebug = 0xFF          // 255
 };