diff --git a/BackBuffer.c b/BackBuffer.c
index fa61d97..9a7caa4 100644
--- a/BackBuffer.c
+++ b/BackBuffer.c
@@ -64,4 +64,22 @@ void draw_bezier(const int *points_x, const int *points_y, size_t num_points, ui
         // Установка пикселя на экране
         set_pixel((int)(x + 0.5f), (int)(y + 0.5f), color);
     }
+}
+
+void grid (uint16_t x, uint16_t y, uint16_t step, uint16_t color){
+    for (uint16_t vgrid = x; vgrid < WIDTH; vgrid+=step)
+    {
+        for (uint16_t hgrid = 0;  hgrid< HEIGHT; hgrid++)
+        {
+            set_pixel(vgrid,hgrid,reverse(color));
+        }
+    }
+
+    for (uint16_t hgrid = y;  hgrid< HEIGHT; hgrid+=step)
+    {
+        for (uint16_t vgrid = 0; vgrid < WIDTH; vgrid++)
+        {
+            set_pixel(vgrid,hgrid,reverse(color));
+        }  
+    }
 }
\ No newline at end of file
diff --git a/BackBuffer.h b/BackBuffer.h
index db1e691..a5a0d92 100644
--- a/BackBuffer.h
+++ b/BackBuffer.h
@@ -16,5 +16,5 @@ void draw_bezier(const int *points_x, const int *points_y, size_t num_points, ui
 unsigned short reverse(unsigned short x);
 void set_pixel(uint16_t x, uint16_t y, uint16_t color);
 void generate_sine_wave_points(uint16_t num_points, int amplitude, float frequency, int offset_x, int offset_y, float phase_shift);
-
+void grid (uint16_t x, uint16_t y, uint16_t step, uint16_t color);
 #endif // __BACKBUFFER_H__
\ No newline at end of file
diff --git a/main.c b/main.c
index ceedd44..4fafe93 100644
--- a/main.c
+++ b/main.c
@@ -26,6 +26,7 @@ int main() {
         data = multicore_fifo_pop_blocking();
         
         fillBufer(frame_buffer,reverse(0x4A69));//
+        grid(20,20,40,0x634d);
         generate_sine_wave_points(num_points, 50, freq, 0, HEIGHT / 2,x);
         draw_string(20,110,L"Кириллица работает!!!",0b1111111111111111); //
         draw_string(50,130,L"Does Latin work?",0b0000000000011111); //Does Latin work?
@@ -36,13 +37,13 @@ int main() {
         {
             if (freq<=0.0){
             minmax=false;}
-            else freq-=0.005;
+            else freq-=0.05;
         }
         else
         {
             if (freq>=10.0){
             minmax=true;}
-            else freq+=0.005;
+            else freq+=0.05;
         }