diff --git a/hcsr04.py b/code/hcsr04.py
similarity index 97%
rename from hcsr04.py
rename to code/hcsr04.py
index 2bbcd95..44e1dd2 100644
--- a/hcsr04.py
+++ b/code/hcsr04.py
@@ -1,7 +1,7 @@
 import machine, time
 from machine import Pin
 
-__version__ = '0.1.0'
+__version__ = '0.2.0'
 __author__ = 'Roberto Sánchez'
 __license__ = "Apache License 2.0. https://www.apache.org/licenses/LICENSE-2.0"
 
@@ -18,7 +18,7 @@ class HCSR04:
         """
         trigger_pin: Output pin to send pulses
         echo_pin: Readonly pin to measure the distance. The pin should be protected with 1k resistor
-        echo_timeout_us: Timeout in microseconds to listen to echo pin.
+        echo_timeout_us: Timeout in microseconds to listen to echo pin. 
         By default is based in sensor limit range (4m)
         """
         self.echo_timeout_us = echo_timeout_us
@@ -54,11 +54,11 @@ class HCSR04:
         """
         pulse_time = self._send_pulse_and_wait()
 
-        # To calculate the distance we get the pulse_time and divide it by 2
+        # To calculate the distance we get the pulse_time and divide it by 2 
         # (the pulse walk the distance twice) and by 29.1 becasue
         # the sound speed on air (343.2 m/s), that It's equivalent to
         # 0.34320 mm/us that is 1mm each 2.91us
-        # pulse_time // 2 // 2.91 -> pulse_time // 5.82 -> pulse_time * 100 // 582
+        # pulse_time // 2 // 2.91 -> pulse_time // 5.82 -> pulse_time * 100 // 582 
         mm = pulse_time * 100 // 582
         return mm
 
@@ -69,9 +69,10 @@ class HCSR04:
         """
         pulse_time = self._send_pulse_and_wait()
 
-        # To calculate the distance we get the pulse_time and divide it by 2
+        # To calculate the distance we get the pulse_time and divide it by 2 
         # (the pulse walk the distance twice) and by 29.1 becasue
         # the sound speed on air (343.2 m/s), that It's equivalent to
         # 0.034320 cm/us that is 1cm each 29.1us
         cms = (pulse_time / 2) / 29.1
         return cms
+