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Lesson-2.markdown

@@ -44,7 +44,7 @@ identical measurements - Due to blocking call so the system waits
 Battery almost out of power - might affect the measurements
 
 The delay from sending a ultrasonic sound, until the echo is received is 2*distance/speed of sound. 
-For the maximum distance of 2,54m the delay will be 2*2.54m /343.21m/s = 14.8ms. 
+For the maximum distance of 2.54m the delay will be 2*2.54m /343.21m/s = 14.8ms. 
 Assuming the air temperature is 20 degrees of celcius.
 This puts a physical time limitation on the usage of the sensor.