averaged the last three results

src/main.c

@@ -4,6 +4,10 @@
 #include <unistd.h>
 #include <hardware/pwm.h>
 
+double percentage_1 = 0;
+double percentage_2 = 0;
+bool flipflop = false;
+
 const uint8_t init[4] = {0x21, 0xa0, 0xef, 0x81};
 const uint8_t zeile[8] = {0x00, 0x02, 0x04, 0x06, 0x08, 0x10, 0x12, 0x14};
 const uint8_t fill[17] = {0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
@@ -144,7 +148,18 @@ void callback(uint gpio, uint32_t events)
 
         volatile int percentage = (distance / 10) * 100;
 
-        set_progress(percentage);
+        if (flipflop)
+        {
+            percentage_1 = percentage;
+            flipflop = false;
+        }
+        else
+        {
+            percentage_2 = percentage;
+            flipflop = true;
+        }
+
+        set_progress((percentage + percentage_1 + percentage_2) / 3);
     }
 
     else if (events & GPIO_IRQ_EDGE_RISE)