diff --git a/src/main.c b/src/main.c
index 61a6d62..cb1420b 100644
--- a/src/main.c
+++ b/src/main.c
@@ -79,10 +79,16 @@ int main(void)
 
 			timebase_ms += 1000 / SYSTICK_FREQ;
 
-			//uint32_t timebase_ms_fast = timebase_ms & 0xFFFFFFFF;
+			uint32_t timebase_ms_fast = timebase_ms & 0xFFFFFFFF;
 
-			// start the measurement in the background.
-			temp_sensor_trigger_update();
+			if(timebase_ms_fast <= 1000) {
+				if((timebase_ms_fast % 100) == 0) {
+					gpio_toggle(LED_PORT, LED_PIN);
+				}
+			} else {
+				// start the measurement in the background.
+				temp_sensor_trigger_update();
+			}
 		}
 
 		// check for completion of a measurement