diff --git a/src/extras/Pixel.cpp b/src/extras/Pixel.cpp
index ad990c5..6b32b5d 100644
--- a/src/extras/Pixel.cpp
+++ b/src/extras/Pixel.cpp
@@ -5,13 +5,13 @@
 
 Pixel::Pixel(int pin, uint32_t nPixels){
     
-  rf=new RFControl(pin,false);                // set clock to 1/80 usec
+  rf=new RFControl(pin,false,false);          // set clock to 1/80 usec, no default driver
   setTiming(0.32, 0.88, 0.64, 0.56, 80.0);    // set default timing parameters (suitable for most SK68 and WS28 RGB pixels)
-  
-  if(nPixels==0)        // must reserve at least enough memory for one pixel per transmission batch
-    nPixels=1;
 
-  nTrain=nPixels;
+  rmt_isr_register(isrHandler,(void *)this,0,NULL);     // end-transmission interrupt automatically enabled by rmt_tx_start
+  rmt_set_tx_thr_intr_en(rf->getChannel(),true,8);      // need to also enable threshold interrupt
+  channelNum=rf->getChannel();
+
 }
 
 ///////////////////
@@ -41,28 +41,45 @@ void Pixel::setRGB(uint8_t r, uint8_t g, uint8_t b, int nPixels){
 
 ///////////////////
 
-void Pixel::setColors(color_t *color, int nPixels){
+void Pixel::setColors(const uint32_t *data, uint32_t nPixels){
   
-  if(!*rf)
-    return;    
-
-  uint32_t *pulses = (uint32_t *) malloc(nTrain*24*sizeof(uint32_t));
-
-  if(!pulses){
-    Serial.printf("*** ERROR:  Not enough memory to reserve for %d Pixels per batch transmission\n",nTrain);
+  if(!*rf || nPixels==0)
     return;
-  }
 
-  int i,j;
-  
-  for(i=0;i<nPixels;){
-    for(j=0;j<nTrain && i<nPixels;j++,i++)
-      loadColor(color[i],pulses+j*24);
-    rf->start(pulses,j*24);
-  }
+  status.nPixels=nPixels;
+  status.data=data;
+  status.iMem=0;
+  status.iBit=24;
+  status.started=true;
+  status.txEndMask=TxEndMask(channelNum);
 
-  free(pulses);
-  delayMicroseconds(resetTime);
+  loadData();             // load first 2 bytes
+  loadData();
+
+  rmt_tx_start(rf->getChannel(),true);
+
+  while(status.started);
+
+
+  return;
+
+//  uint32_t *pulses = (uint32_t *) malloc(nTrain*24*sizeof(uint32_t));
+//
+//  if(!pulses){
+//    Serial.printf("*** ERROR:  Not enough memory to reserve for %d Pixels per batch transmission\n",nTrain);
+//    return;
+//  }
+//
+//  int i,j;
+//  
+//  for(i=0;i<nPixels;){
+//    for(j=0;j<nTrain && i<nPixels;j++,i++)
+//      loadColor(color[i],pulses+j*24);
+//    rf->start(pulses,j*24);
+//  }
+//
+//  free(pulses);
+//  delayMicroseconds(resetTime);
 }
 
 ///////////////////
@@ -101,3 +118,41 @@ color_t Pixel::getColorHSV(float h, float s, float v){
 }
 
 ///////////////////
+
+void Pixel::loadData(){
+  
+  if(status.nPixels==0){
+    RMTMEM.chan[channelNum].data32[status.iMem].val=0;
+    return;
+  }
+  
+  for(int i=0;i<8;i++)
+    RMTMEM.chan[channelNum].data32[status.iMem++].val=pattern[(*status.data>>(--status.iBit))&1];
+    
+  if(status.iBit==0){
+    status.iBit=24;
+    status.data++;
+    status.nPixels--;    
+  }
+  status.iMem%=memSize;
+}
+
+///////////////////
+
+void Pixel::isrHandler(void *arg){
+
+  Pixel *pix=(Pixel *)arg;
+
+  if(RMT.int_st.val & status.txEndMask){
+    RMT.int_clr.val=~0;
+    status.started=false;
+    return;
+  }
+  
+  RMT.int_clr.val=~0;
+  pix->loadData();
+}
+
+///////////////////
+
+volatile pixel_status_t Pixel::status;
diff --git a/src/extras/Pixel.h b/src/extras/Pixel.h
index 01053f3..9b07509 100644
--- a/src/extras/Pixel.h
+++ b/src/extras/Pixel.h
@@ -10,13 +10,41 @@
 
 typedef uint32_t color_t;
 
+struct pixel_status_t {
+  int nPixels;
+  const uint32_t *data;
+  int iBit;
+  int iMem;
+  boolean started;
+  uint32_t txEndMask;            // mask for end-of-transmission interrupt
+};
+
 class Pixel {
   private:
     uint32_t pattern[2];           // storage for zero-bit and one-bit pulses
     uint32_t resetTime;            // minimum time (in usec) between pulse trains
+    int channelNum;                // channel number
+ 
     uint32_t nTrain;               // number of Pixels to transmit per pulse train batch
+
+  #if defined(CONFIG_IDF_TARGET_ESP32)
+    const int memSize=64;
+    #define TxEndMask(chNum) (1<<(chNum*3))
+  #elif defined(CONFIG_IDF_TARGET_ESP32S2)
+    const int memSize=48;
+    #define TxEndMask(chNum) (1<<(chNum*3))
+  #elif defined(CONFIG_IDF_TARGET_ESP32C3)
+    const int memSize=48;
+    #define TxEndMask(chNum) (1<<chNum)
+  #else
+    const int memSize=0;
+  #endif
     
     RFControl *rf;
+
+    volatile static pixel_status_t status;
+    
+    static void isrHandler(void *arg);         // interrupt handler 
     void loadColor(color_t c, uint32_t *p);    // creates pulse pattern for pixel color (encoded as RGB in low 24-bits of *p)
   
   public:
@@ -26,11 +54,13 @@ class Pixel {
       
     void setRGB(uint8_t r, uint8_t g, uint8_t b, int nPixels=1);    // sets color of nPixels to RGB values (0-255)
     void setHSV(float h, float s, float v, int nPixels=1);          // sets color of nPixels to HSV values where h=[0,360], s=[0,100], v=[0,100]   
-    void setColors(color_t *color, int nPixels);                    // sets colors of nPixels from array of Colors
+    void setColors(const uint32_t *data, uint32_t nPixels);              // sets colors of nPixels from array of Colors
     int getPin(){return(rf->getPin());}                             // returns pixel pin if valid, else returns -1
     
     static color_t getColorRGB(uint8_t r, uint8_t g, uint8_t b);    // return pixel Color from RGB values
     static color_t getColorHSV(float h, float s, float v);          // return pixel Color from HSV values
+    
+    void loadData();
 
     operator bool(){         // override boolean operator to return true/false if creation succeeded/failed
       return(*rf);
diff --git a/src/extras/RFControl.cpp b/src/extras/RFControl.cpp
index 7d1a78f..182cefb 100644
--- a/src/extras/RFControl.cpp
+++ b/src/extras/RFControl.cpp
@@ -128,7 +128,6 @@ void RFControl::enableCarrier(uint32_t freq, float duty){
       return;
     }
 
-//    Serial.printf("%d %g %d %d\n",freq,period,highTime,lowTime);
     rmt_set_tx_carrier(config->channel,true,highTime,lowTime,RMT_CARRIER_LEVEL_HIGH);       
   } else {
     rmt_set_tx_carrier(config->channel,false,0,0,RMT_CARRIER_LEVEL_HIGH);           
diff --git a/src/extras/extras.ino b/src/extras/extras.ino
index 226fad2..a944271 100644
--- a/src/extras/extras.ino
+++ b/src/extras/extras.ino
@@ -95,6 +95,23 @@ void setup() {
 
   Serial.println("\n\nHomeSpan Pixel Example\n");
 
+  Pixel px(1);
+
+  uint32_t colors[20];
+
+  colors[0]=px.getColorRGB(40,40,0);
+  colors[1]=px.getColorRGB(40,40,0);
+  colors[2]=px.getColorRGB(40,0,0);
+  colors[3]=px.getColorRGB(0,0,40);
+  colors[4]=px.getColorRGB(40,0,0);
+  colors[5]=px.getColorRGB(40,0,0);
+  colors[6]=px.getColorRGB(40,0,0);
+  colors[7]=px.getColorRGB(0,0,40);
+  
+  px.setColors(colors,8);
+  Serial.println("\n\nDone\n\n");
+  while(1);
+
   RFControl rf(PIN,true,false);
   rmt_set_clk_div(rf.getChannel(),100);                  // set clock divider