diff --git a/main.ts b/main.ts
index 18a0fc7..f909dbf 100644
--- a/main.ts
+++ b/main.ts
@@ -245,7 +245,7 @@ namespace mbit_Sensor {
         pins.digitalWritePin(Trig, 0);
         control.waitMicros(2);
         pins.digitalWritePin(Trig, 1);
-        control.waitMicros(10);
+        control.waitMicros(15);
         pins.digitalWritePin(Trig, 0);
 
         // read pulse
@@ -907,7 +907,7 @@ namespace mbit_Robot {
         pins.digitalWritePin(DigitalPin.P14, 0);
         control.waitMicros(2);
         pins.digitalWritePin(DigitalPin.P14, 1);
-        control.waitMicros(10);
+        control.waitMicros(15);
         pins.digitalWritePin(DigitalPin.P14, 0);
 
         // read pulse