Update Lecture4.md

Author: benpaddlejones

tutorials/Lecture4.md

@@ -5,13 +5,13 @@
 - [Class Overview](#class-overview)
 - [Create Files](#create-files)
 - [Imports and Constructor](#imports-and-constructor)
-- [Implement an Interupt](#implement-an-interupt)
+- [Implement an Interrupt](#implement-an-interrupt)
 - [Getter and Setter](#getter-and-setter)
-- [Create a Callback Method for the Interupt Trigger](#create-a-callback-method-for-the-interupt-trigger)
+- [Create a Callback Method for the Interrupt Trigger](#create-a-callback-method-for-the-interrupt-trigger)
 
 ## Class Overview
 
-The Pedestrian_Button class extends the machine.Pin class to provide a debounced button interface specifically designed for pedestrian crossing systems. It uses interrupt-based detection and software debouncing to reliably capture button presses. It also provides optional debug output.
+The Pedestrian_Button class extends the Pin class to provide a debounced button interface specifically designed for pedestrian crossing systems. It uses interrupt-based detection and software debouncing to reliably capture button presses. It also provides optional debug output.
 
 ## Create Files
 
@@ -20,7 +20,7 @@ The Pedestrian_Button class extends the machine.Pin class to provide a debounced
 
 ## Imports and Constructor
 
-In your `pedestrian_button.py` include your imports, define the class and configure the initialiser with the paramters pin and debug. Add the required parameters to store time and hold state when the button has been pressed.
+In your `pedestrian_button.py` include your imports, define the class and configure the initialiser with the parameters pin and debug. Add the required parameters to store time and hold state if the button has been pressed.
 
 ```python
 from machine import Pin
@@ -41,7 +41,7 @@ class Pedestrian_Button(Pin):
         )  # Set up interrupt on rising edge
 ```
 
-## Implement an Interupt
+## Implement an Interrupt
 
 An interrupt is a signal to the processor that an event needs immediate attention. Instead of constantly checking (polling) if something has happened, interrupts allow the system to be notified immediately when an event occurs.
 
@@ -62,7 +62,7 @@ class Pedestrian_Button(Pin):
 
 ## Getter and Setter
 
-Our system has a design requirement that the button state is stored until the walk lights have been displayed. So because we are not setting or getting the current state of the button as we did with the LED_Light Class, we will use an Adhoc method that updates the `__pedestrian_waiting` attribute.
+Our system has a design requirement that the button state is stored until the walk lights have been displayed. So, because we are not setting or getting the current state of the button as we did with the LED_Light Class, we will use an ad hoc method that updates the `__pedestrian_waiting` attribute.
 
 - If `button_state()` is called with no arguments, it returns the current state (getter).
 - If `button_state(bool)` is called with a boolean argument, it sets the state (setter).
@@ -86,9 +86,9 @@ Our system has a design requirement that the button state is stored until the wa
                 )
 ```
 
-## Create a Callback Method for the Interupt Trigger
+## Create a Callback Method for the Interrupt Trigger
 
-This `clallback()` was configured in the attributes and will be executed in response to an interupt call.
+This `callback()` was configured in the attributes and will be executed in response to an interrupt call.
 
 ```python
     def callback(self, pin):
@@ -100,4 +100,4 @@ This `clallback()` was configured in the attributes and will be executed in resp
             self.__pedestrian_waiting = True
             if self.__debug:
                 print(f"Button pressed on Pin {self.__pin} at {current_time}ms")
-```
+```