diff --git a/docs/epd_4in2_sample1.txt b/docs/epd_4in2_sample1.txt
new file mode 100644
index 0000000..220e3c2
--- /dev/null
+++ b/docs/epd_4in2_sample1.txt
@@ -0,0 +1,17 @@
+Paint_DrawPoint(10, 80, BLACK, DOT_PIXEL_1X1, DOT_STYLE_DFT);
+    Paint_DrawPoint(10, 90, BLACK, DOT_PIXEL_2X2, DOT_STYLE_DFT);
+    Paint_DrawPoint(10, 100, BLACK, DOT_PIXEL_3X3, DOT_STYLE_DFT);
+    Paint_DrawLine(20, 70, 70, 120, BLACK, DOT_PIXEL_1X1, LINE_STYLE_SOLID);
+    Paint_DrawLine(70, 70, 20, 120, BLACK, DOT_PIXEL_1X1, LINE_STYLE_SOLID);
+    Paint_DrawRectangle(20, 70, 70, 120, BLACK, DOT_PIXEL_1X1, DRAW_FILL_EMPTY);
+    Paint_DrawRectangle(80, 70, 130, 120, BLACK, DOT_PIXEL_1X1, DRAW_FILL_FULL);
+    Paint_DrawCircle(45, 95, 20, BLACK, DOT_PIXEL_1X1, DRAW_FILL_EMPTY);
+    Paint_DrawCircle(105, 95, 20, WHITE, DOT_PIXEL_1X1, DRAW_FILL_FULL);
+    Paint_DrawLine(85, 95, 125, 95, BLACK, DOT_PIXEL_1X1, LINE_STYLE_DOTTED);
+    Paint_DrawLine(105, 75, 105, 115, BLACK, DOT_PIXEL_1X1, LINE_STYLE_DOTTED);
+    Paint_DrawString_EN(10, 0, "waveshare", &Font16, BLACK, WHITE);
+    Paint_DrawString_EN(10, 20, "hello world", &Font12, WHITE, BLACK);
+    Paint_DrawNum(10, 33, 123456789, &Font12, BLACK, WHITE);
+    Paint_DrawNum(10, 50, 987654321, &Font16, WHITE, BLACK);
+    Paint_DrawString_CN(130, 0, " 你好abc", &Font12CN, BLACK, WHITE);
+    Paint_DrawString_CN(130, 20, "微雪电子", &Font24CN, WHITE, BLACK);
diff --git a/docs/epd_4in2_sample1_display.jpg b/docs/epd_4in2_sample1_display.jpg
new file mode 100644
index 0000000..d068813
Binary files /dev/null and b/docs/epd_4in2_sample1_display.jpg differ
diff --git a/docs/epd_4in2_sample2.txt b/docs/epd_4in2_sample2.txt
new file mode 100644
index 0000000..17fad99
--- /dev/null
+++ b/docs/epd_4in2_sample2.txt
@@ -0,0 +1,25 @@
+
+    Paint_DrawPoint(10, 80, BLACK, DOT_PIXEL_1X1, DOT_STYLE_DFT);
+    Paint_DrawPoint(10, 90, BLACK, DOT_PIXEL_2X2, DOT_STYLE_DFT);
+    Paint_DrawPoint(10, 100, BLACK, DOT_PIXEL_3X3, DOT_STYLE_DFT);
+    Paint_DrawLine(20, 70, 70, 120, BLACK, DOT_PIXEL_1X1, LINE_STYLE_SOLID);
+    Paint_DrawLine(70, 70, 20, 120, BLACK, DOT_PIXEL_1X1, LINE_STYLE_SOLID);
+    Paint_DrawRectangle(20, 70, 70, 120, BLACK, DOT_PIXEL_1X1, DRAW_FILL_EMPTY);
+    Paint_DrawRectangle(80, 70, 130, 120, BLACK, DOT_PIXEL_1X1, DRAW_FILL_FULL);
+    Paint_DrawCircle(45, 95, 20, BLACK, DOT_PIXEL_1X1, DRAW_FILL_EMPTY);
+    Paint_DrawCircle(105, 95, 20, WHITE, DOT_PIXEL_1X1, DRAW_FILL_FULL);
+    Paint_DrawLine(85, 95, 125, 95, BLACK, DOT_PIXEL_1X1, LINE_STYLE_DOTTED);
+    Paint_DrawLine(105, 75, 105, 115, BLACK, DOT_PIXEL_1X1, LINE_STYLE_DOTTED);
+    Paint_DrawString_EN(10, 0, "waveshare", &Font16, BLACK, WHITE);
+    Paint_DrawString_EN(10, 20, "hello world", &Font12, WHITE, BLACK);
+    Paint_DrawNum(10, 33, 123456789, &Font12, BLACK, WHITE);
+    Paint_DrawNum(10, 50, 987654321, &Font16, WHITE, BLACK);
+    Paint_DrawString_CN(140, 0, "你好abc", &Font12CN, GRAY1, GRAY4);
+    Paint_DrawString_CN(140, 40, "你好abc", &Font12CN, GRAY2, GRAY3);
+    Paint_DrawString_CN(140, 80, "你好abc", &Font12CN, GRAY3, GRAY2);
+    Paint_DrawString_CN(140, 120, "你好abc", &Font12CN, GRAY4, GRAY1);
+
+    Paint_DrawString_CN(220, 0, "微雪电子", &Font24CN, GRAY1, GRAY4);
+    Paint_DrawString_CN(220, 40, "微雪电子", &Font24CN, GRAY2, GRAY3);
+    Paint_DrawString_CN(220, 80, "微雪电子", &Font24CN, GRAY3, GRAY2);
+    Paint_DrawString_CN(220, 120, "微雪电子", &Font24CN, GRAY4, GRAY1);
diff --git a/docs/epd_4in2_sample2_display.jpg b/docs/epd_4in2_sample2_display.jpg
new file mode 100644
index 0000000..ab1f9c2
Binary files /dev/null and b/docs/epd_4in2_sample2_display.jpg differ
diff --git a/platformio.ini b/platformio.ini
index f640cb5..fce0f5d 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -13,5 +13,7 @@ platform = espressif32
 board = esp32doit-devkit-v1
 framework = arduino
 
+monitor_speed = 115200
+
 lib_deps=
     SPI
diff --git a/src/main.cpp b/src/main.cpp
index 74efa20..39b681d 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,164 +1,93 @@
-// Library, connections and info from: https://www.waveshare.com/wiki/E-Paper_ESP32_Driver_Board#Resource
-
-/* Includes ------------------------------------------------------------------*/
-#include "DEV_Config.h"
-#include "EPD.h"
-#include "GUI_Paint.h"
-#include "ImageData.h"
-#include <stdlib.h>
-
-/* Entry point ----------------------------------------------------------------*/
-void setup()
-{
-  printf("EPD_4IN2_test Demo\r\n");
-  DEV_Module_Init();
-
-  printf("e-Paper Init and Clear...\r\n");
-  EPD_4IN2_Init_Fast();
-  EPD_4IN2_Clear();
-  DEV_Delay_ms(500);
-
-  //Create a new image cache
-  UBYTE *BlackImage;
-  /* you have to edit the startup_stm32fxxx.s file and set a big enough heap size */
-  UWORD Imagesize = ((EPD_4IN2_WIDTH % 8 == 0) ? (EPD_4IN2_WIDTH / 8 ) : (EPD_4IN2_WIDTH / 8 + 1)) * EPD_4IN2_HEIGHT;
-  if ((BlackImage = (UBYTE *)malloc(Imagesize)) == NULL) {
-    printf("Failed to apply for black memory...\r\n");
-    while (1);
-  }
-  printf("Paint_NewImage\r\n");
-  Paint_NewImage(BlackImage, EPD_4IN2_WIDTH, EPD_4IN2_HEIGHT, 0, WHITE);
-
-#if 1   // show image for array   
-  printf("show image for array\r\n");
-  Paint_SelectImage(BlackImage);
-  Paint_Clear(WHITE);
-  Paint_DrawBitMap(gImage_4in2);
-  EPD_4IN2_Display(BlackImage);
-  DEV_Delay_ms(500);
-#endif
-
-#if 1   // Drawing on the image
-  //1.Select Image
-  printf("SelectImage:BlackImage\r\n");
-  Paint_SelectImage(BlackImage);
-  Paint_Clear(WHITE);
-
-  // 2.Drawing on the image
-  printf("Drawing:BlackImage\r\n");
-  Paint_DrawPoint(10, 80, BLACK, DOT_PIXEL_1X1, DOT_STYLE_DFT);
-  Paint_DrawPoint(10, 90, BLACK, DOT_PIXEL_2X2, DOT_STYLE_DFT);
-  Paint_DrawPoint(10, 100, BLACK, DOT_PIXEL_3X3, DOT_STYLE_DFT);
-  Paint_DrawLine(20, 70, 70, 120, BLACK, DOT_PIXEL_1X1, LINE_STYLE_SOLID);
-  Paint_DrawLine(70, 70, 20, 120, BLACK, DOT_PIXEL_1X1, LINE_STYLE_SOLID);
-  Paint_DrawRectangle(20, 70, 70, 120, BLACK, DOT_PIXEL_1X1, DRAW_FILL_EMPTY);
-  Paint_DrawRectangle(80, 70, 130, 120, BLACK, DOT_PIXEL_1X1, DRAW_FILL_FULL);
-  Paint_DrawCircle(45, 95, 20, BLACK, DOT_PIXEL_1X1, DRAW_FILL_EMPTY);
-  Paint_DrawCircle(105, 95, 20, WHITE, DOT_PIXEL_1X1, DRAW_FILL_FULL);
-  Paint_DrawLine(85, 95, 125, 95, BLACK, DOT_PIXEL_1X1, LINE_STYLE_DOTTED);
-  Paint_DrawLine(105, 75, 105, 115, BLACK, DOT_PIXEL_1X1, LINE_STYLE_DOTTED);
-  Paint_DrawString_EN(10, 0, "waveshare", &Font16, BLACK, WHITE);
-  Paint_DrawString_EN(10, 20, "hello world", &Font12, WHITE, BLACK);
-  Paint_DrawNum(10, 33, 123456789, &Font12, BLACK, WHITE);
-  Paint_DrawNum(10, 50, 987654321, &Font16, WHITE, BLACK);
-  Paint_DrawString_CN(130, 0, " 你好abc", &Font12CN, BLACK, WHITE);
-  Paint_DrawString_CN(130, 20, "微雪电子", &Font24CN, WHITE, BLACK);
-
-  printf("EPD_Display\r\n");
-  EPD_4IN2_Display(BlackImage);
-  DEV_Delay_ms(2000);
-#endif
-
-
-#if 0
-  printf("Support for partial refresh, but the refresh effect is not good, but it is not recommended\r\n");
-  printf("Partial refresh\r\n");
-  EPD_4IN2_Init_Partial();
-  PAINT_TIME sPaint_time;
-  sPaint_time.Hour = 12;
-  sPaint_time.Min = 34;
-  sPaint_time.Sec = 56;
-  UBYTE num = 10;
-  for (;;) {
-    sPaint_time.Sec = sPaint_time.Sec + 1;
-    if (sPaint_time.Sec == 60) {
-      sPaint_time.Min = sPaint_time.Min + 1;
-      sPaint_time.Sec = 0;
-      if (sPaint_time.Min == 60) {
-        sPaint_time.Hour =  sPaint_time.Hour + 1;
-        sPaint_time.Min = 0;
-        if (sPaint_time.Hour == 24) {
-          sPaint_time.Hour = 0;
-          sPaint_time.Min = 0;
-          sPaint_time.Sec = 0;
-        }
-      }
-    }
-    Paint_ClearWindows(150, 80, 150 + Font20.Width * 7, 80 + Font20.Height, WHITE);
-    Paint_DrawTime(150, 80, &sPaint_time, &Font20, WHITE, BLACK);
-    EPD_4IN2_PartialDisplay(150, 80, 150 + Font20.Width * 7, 80 + Font20.Height, BlackImage);
-    DEV_Delay_ms(500);//Analog clock 1s
-    num = num - 1;
-    if (num == 0) {
-      break;
-    }
-  }
-#endif
-
-#if 1
-  EPD_4IN2_Init_4Gray();
-  printf("show Gray------------------------\r\n");
-  free(BlackImage);
-  BlackImage = NULL;
-  Imagesize = ((EPD_4IN2_WIDTH % 8 == 0) ? (EPD_4IN2_WIDTH / 4 ) : (EPD_4IN2_WIDTH / 4 + 1)) * EPD_4IN2_HEIGHT;
-  if ((BlackImage = (UBYTE *)malloc(Imagesize)) == NULL) {
-    printf("Failed to apply for black memory...\r\n");
-    while (1);
-  }
-  Paint_NewImage(BlackImage, EPD_4IN2_WIDTH, EPD_4IN2_HEIGHT, 0, WHITE);
-  Paint_SetScale(4);
-  Paint_Clear(WHITE);
-
-  Paint_DrawPoint(10, 80, BLACK, DOT_PIXEL_1X1, DOT_STYLE_DFT);
-  Paint_DrawPoint(10, 90, BLACK, DOT_PIXEL_2X2, DOT_STYLE_DFT);
-  Paint_DrawPoint(10, 100, BLACK, DOT_PIXEL_3X3, DOT_STYLE_DFT);
-  Paint_DrawLine(20, 70, 70, 120, BLACK, DOT_PIXEL_1X1, LINE_STYLE_SOLID);
-  Paint_DrawLine(70, 70, 20, 120, BLACK, DOT_PIXEL_1X1, LINE_STYLE_SOLID);
-  Paint_DrawRectangle(20, 70, 70, 120, BLACK, DOT_PIXEL_1X1, DRAW_FILL_EMPTY);
-  Paint_DrawRectangle(80, 70, 130, 120, BLACK, DOT_PIXEL_1X1, DRAW_FILL_FULL);
-  Paint_DrawCircle(45, 95, 20, BLACK, DOT_PIXEL_1X1, DRAW_FILL_EMPTY);
-  Paint_DrawCircle(105, 95, 20, WHITE, DOT_PIXEL_1X1, DRAW_FILL_FULL);
-  Paint_DrawLine(85, 95, 125, 95, BLACK, DOT_PIXEL_1X1, LINE_STYLE_DOTTED);
-  Paint_DrawLine(105, 75, 105, 115, BLACK, DOT_PIXEL_1X1, LINE_STYLE_DOTTED);
-  Paint_DrawString_EN(10, 0, "waveshare", &Font16, BLACK, WHITE);
-  Paint_DrawString_EN(10, 20, "hello world", &Font12, WHITE, BLACK);
-  Paint_DrawNum(10, 33, 123456789, &Font12, BLACK, WHITE);
-  Paint_DrawNum(10, 50, 987654321, &Font16, WHITE, BLACK);
-  Paint_DrawString_CN(140, 0, "你好abc", &Font12CN, GRAY1, GRAY4);
-  Paint_DrawString_CN(140, 40, "你好abc", &Font12CN, GRAY2, GRAY3);
-  Paint_DrawString_CN(140, 80, "你好abc", &Font12CN, GRAY3, GRAY2);
-  Paint_DrawString_CN(140, 120, "你好abc", &Font12CN, GRAY4, GRAY1);
-
-  Paint_DrawString_CN(220, 0, "微雪电子", &Font24CN, GRAY1, GRAY4);
-  Paint_DrawString_CN(220, 40, "微雪电子", &Font24CN, GRAY2, GRAY3);
-  Paint_DrawString_CN(220, 80, "微雪电子", &Font24CN, GRAY3, GRAY2);
-  Paint_DrawString_CN(220, 120, "微雪电子", &Font24CN, GRAY4, GRAY1);
-
-  EPD_4IN2_4GrayDisplay(BlackImage);
-  DEV_Delay_ms(2000);
-#endif
-
-  EPD_4IN2_Init_Fast();
-  EPD_4IN2_Clear();
-
-  printf("Goto Sleep...\r\n");
-  EPD_4IN2_Sleep();
-  free(BlackImage);
-  BlackImage = NULL;
-}
-
-/* The main loop -------------------------------------------------------------*/
-void loop()
-{
-  //
-}
+// Library, connections and info from: https://www.waveshare.com/wiki/E-Paper_ESP32_Driver_Board#Resource
+// Display: https://www.waveshare.com/product/4.2inch-e-paper.htm
+
+/* Includes ------------------------------------------------------------------*/
+#include "DEV_Config.h"
+#include "EPD.h"
+#include "GUI_Paint.h"
+#include <stdlib.h>
+
+void setup()
+{
+    Serial.begin(115200);
+    Serial.println("Booting");
+    DEV_Module_Init(); //4.2"  400x300px
+
+    Serial.println("e-Paper Init");
+    EPD_4IN2_Init_Fast();
+
+    Serial.println("e-Paper clear");
+    EPD_4IN2_Clear(); //flashed black 2 times. long, short
+
+
+    Serial.println("e-Paper init 4gray");
+    DEV_Delay_ms(1000);
+    EPD_4IN2_Init_4Gray();
+    UBYTE *BlackImage;
+    UWORD Imagesize = ((EPD_4IN2_WIDTH % 8 == 0) ? (EPD_4IN2_WIDTH / 4 ) : (EPD_4IN2_WIDTH / 4 + 1)) * EPD_4IN2_HEIGHT;
+    if ((BlackImage = (UBYTE *)malloc(Imagesize)) == NULL) {
+        printf("Failed to apply for black memory...\r\n");
+        while (1);
+    }
+    Paint_NewImage(BlackImage, EPD_4IN2_WIDTH, EPD_4IN2_HEIGHT, 0, WHITE);
+    Paint_SelectImage(BlackImage);
+    Paint_SetScale(4);
+    
+    
+    /*
+    Paint_Clear(WHITE);
+    Paint_DrawPoint(10, 80, BLACK, DOT_PIXEL_1X1, DOT_STYLE_DFT);
+    Paint_DrawPoint(10, 90, BLACK, DOT_PIXEL_2X2, DOT_STYLE_DFT);
+    Paint_DrawPoint(10, 100, BLACK, DOT_PIXEL_3X3, DOT_STYLE_DFT);
+    Paint_DrawLine(20, 70, 70, 120, BLACK, DOT_PIXEL_1X1, LINE_STYLE_SOLID);
+    Paint_DrawLine(70, 70, 20, 120, BLACK, DOT_PIXEL_1X1, LINE_STYLE_SOLID);
+    Paint_DrawRectangle(20, 70, 70, 120, BLACK, DOT_PIXEL_1X1, DRAW_FILL_EMPTY);
+    Paint_DrawRectangle(80, 70, 130, 120, BLACK, DOT_PIXEL_1X1, DRAW_FILL_FULL);
+    Paint_DrawCircle(45, 95, 20, BLACK, DOT_PIXEL_1X1, DRAW_FILL_EMPTY);
+    Paint_DrawCircle(105, 95, 20, WHITE, DOT_PIXEL_1X1, DRAW_FILL_FULL);
+    Paint_DrawLine(85, 95, 125, 95, BLACK, DOT_PIXEL_1X1, LINE_STYLE_DOTTED);
+    Paint_DrawLine(105, 75, 105, 115, BLACK, DOT_PIXEL_1X1, LINE_STYLE_DOTTED);
+    Paint_DrawString_EN(10, 0, "waveshare", &Font16, BLACK, WHITE);
+    Paint_DrawString_EN(10, 20, "hello world", &Font12, WHITE, BLACK);
+    Paint_DrawNum(10, 33, 123456789, &Font12, BLACK, WHITE);
+    Paint_DrawNum(10, 50, 987654321, &Font16, WHITE, BLACK);
+    Paint_DrawString_CN(140, 0, "你好abc", &Font12CN, GRAY1, GRAY4);
+    Paint_DrawString_CN(140, 40, "你好abc", &Font12CN, GRAY2, GRAY3);
+    Paint_DrawString_CN(140, 80, "你好abc", &Font12CN, GRAY3, GRAY2);
+    Paint_DrawString_CN(140, 120, "你好abc", &Font12CN, GRAY4, GRAY1);
+
+    Paint_DrawString_CN(220, 0, "微雪电子", &Font24CN, GRAY1, GRAY4);
+    Paint_DrawString_CN(220, 40, "微雪电子", &Font24CN, GRAY2, GRAY3);
+    Paint_DrawString_CN(220, 80, "微雪电子", &Font24CN, GRAY3, GRAY2);
+    Paint_DrawString_CN(220, 120, "微雪电子", &Font24CN, GRAY4, GRAY1);
+    */
+    
+    Serial.println("e-Paper Start Lines Test");
+    DEV_Delay_ms(1000);
+    for (uint16_t i=0;i<100;i++) {
+        Serial.print("Lines ystart="); 
+        Serial.print(i%2);
+        Serial.print(" i="); 
+        Serial.println(i);
+        Paint_Clear(WHITE);
+        for (uint16_t y=i%2;y<EPD_4IN2_HEIGHT;y=y+2) {
+            Paint_DrawLine(0, y, EPD_4IN2_WIDTH, y, BLACK, DOT_PIXEL_1X1, LINE_STYLE_SOLID);
+        }
+        EPD_4IN2_4GrayDisplay(BlackImage);
+        DEV_Delay_ms(5000);
+    }
+
+    EPD_4IN2_Init_Fast();
+    EPD_4IN2_Clear();
+
+    printf("Goto Sleep...\r\n");
+    EPD_4IN2_Sleep();
+    free(BlackImage);
+    BlackImage = NULL;
+}
+
+/* The main loop -------------------------------------------------------------*/
+void loop()
+{
+  //
+}