diff --git a/src/main.c b/src/main.c
index 0a9a341..7b1bf53 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,5 +1,20 @@
 #include <ncurses.h>
+#include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
+
+const int digit_bitmaps[10][5][3] = {
+    {{1,1,1},{1,0,1},{1,0,1},{1,0,1},{1,1,1}}, // 0
+    {{0,1,0},{1,1,0},{0,1,0},{0,1,0},{1,1,1}}, // 1
+    {{1,1,1},{0,0,1},{1,1,1},{1,0,0},{1,1,1}}, // 2
+    {{1,1,1},{0,0,1},{1,1,1},{0,0,1},{1,1,1}}, // 3
+    {{1,0,1},{1,0,1},{1,1,1},{0,0,1},{0,0,1}}, // 4
+    {{1,1,1},{1,0,0},{1,1,1},{0,0,1},{1,1,1}}, // 5
+    {{1,1,1},{1,0,0},{1,1,1},{1,0,1},{1,1,1}}, // 6
+    {{1,1,1},{0,0,1},{0,1,0},{0,1,0},{0,1,0}}, // 7
+    {{1,1,1},{1,0,1},{1,1,1},{1,0,1},{1,1,1}}, // 8
+    {{1,1,1},{1,0,1},{1,1,1},{0,0,1},{1,1,1}}  // 9
+};
 
 void get_data(int *speed, int *power, int *bat, float *tq, int *rpm, int *eff, float *bat_temp, float *var_temp, float *mot_temp)
 {
@@ -14,6 +29,57 @@ void get_data(int *speed, int *power, int *bat, float *tq, int *rpm, int *eff, f
         *mot_temp = (float)rand() / (float)RAND_MAX * 150.0f;
 }
 
+void win_clear(WINDOW *lwin) {
+        int y, x;
+        getmaxyx(lwin, y, x);
+        for (int i = 1; i < y - 1; i++) {
+                mvwhline(lwin, i, 1, ' ', x - 2);
+        }
+}
+
+int smaller_of(int a, int b) {
+        return (a < b) ? a : b;
+}
+
+void wspeed(WINDOW *lwin, int speed){
+        int lwiny, lwinx, len;
+        char buf[16];
+        getmaxyx(lwin, lwiny, lwinx);
+        snprintf(buf , sizeof(buf), "%d", speed);
+        len = strlen(buf);
+
+        int bh = 5;   // bitmap height
+        int bw = 3;   // bitmap width
+
+        int size = smaller_of((lwiny - 2) / bh, (lwinx - 2 - (3 - 1)) / (bw * 3));
+
+        int total_width = 3 * (bw * size) + 2;
+        int startx = (lwinx - total_width) / 2;
+        int starty = (lwiny - bh * size) / 2;
+
+        win_clear(lwin);
+
+        for (int d = 0; d < len; d++) {
+                int digit = buf[d] - '0';
+                int dx = startx + d * (bw * size + 1);
+        
+                for (int y = 0; y < bh; y++) {
+                        for (int x = 0; x < bw; x++) {
+                                if (digit_bitmaps[digit][y][x]) {
+                                for (int yy = 0; yy < size; yy++)
+                                        for (int xx = 0; xx < size; xx++)
+                                        mvwaddch(lwin,
+                                                starty + y * size + yy,
+                                                dx + x * size + xx,
+                                                ACS_CKBOARD);
+                                }
+                        }
+                }
+        }
+
+        wrefresh(lwin);
+}
+
 int main()
 {	
         initscr();
@@ -25,6 +91,9 @@ int main()
 
         int y,x;
         getmaxyx(stdscr, y, x);
+        if (y < 42 || x < 100){
+                return 1;
+        }
 
         WINDOW *win[10];
 
@@ -71,6 +140,7 @@ int main()
         while(ch == ERR)
         {
                 get_data(&speed, &power, &bat, &tq, &rpm, &eff, &bat_temp, &var_temp, &mot_temp);
+                wspeed(win[0], speed);
                 ch = getch();
         };