Added code source information comments to LCD and Arduino code

physical/arduino/arduino0_motor_button/arduino0_motor_button.ino

+// --------------------------------------------------------------------------
+// Arduino sketch for controlling a servo motor and reading button presses
+// The very core concepts of this sketch were taken from Lab1_code2
+// https://gitlab.com/IOTGarage/iot-lab-book/-/tree/070cf41b33cffdc1f1f90f6a42e1e16215db24be/LAB%2001%20-%20Micro-Controller%20Programming/Lab1_code2
+// However two-way serial communication was added to allow the servo to be controlled from Node-Red, and the buttons to send messages to Node-Red
+// --------------------------------------------------------------------------
+
 // Include the Servo library
 #include <Servo.h>
 
@@ -17,7 +24,10 @@ Servo myservo;
 void setup() {
   Serial.begin(9600); // Start serial communication at 9600 baud
 
-  // Initialise button pins as input
+  // Initialise button pins as input_pullup
+  // This means the button will read LOW when pressed and HIGH when not pressed
+  // This change was made from the original code, which used INPUT
+  // This is because, through research, we found input_pullup is more reliable for buttons
   pinMode(BUTTON1_PIN, INPUT_PULLUP);
   pinMode(BUTTON2_PIN, INPUT_PULLUP);
   
@@ -33,7 +43,7 @@ void loop()
 
     Serial.println("Received: " + command); // Serial output for debugging
 
-    // Check if the command starts with "SERVO " (e.g., "SERVO 90")
+    // Check if the command starts with "SERVO " (e.g. "SERVO 90")
     // This is the expected format for controlling the servo
     if (command.startsWith("SERVO ")) {
       int angle = command.substring(6).toInt(); // Extract angle value

physical/arduino/arduino1_motor_motionsensor/arduino1_motor_motionsensor.ino

+// --------------------------------------------------------------------------
+// Arduino sketch for controlling a servo motor and reading button presses
+// The very core concepts of this sketch were taken from Lab1_code1
+// https://gitlab.com/IOTGarage/iot-lab-book/-/blob/070cf41b33cffdc1f1f90f6a42e1e16215db24be/LAB%2001%20-%20Micro-Controller%20Programming/Lab1_code1
+// However two-way serial communication was added to allow the servo to be controlled from Node-Red, and the PIR motion sensor to send messages to Node-Red
+// This motion sensor also has a toggle function, allowing it to be turned on and off from Node-Red, allowing for timely servo control when needed
+// --------------------------------------------------------------------------
+
+
 // Include the Servo library
 #include <Servo.h>
 

physical/lcd_display.py

+# --------------------------------------------------------------------------
+# This code is adapted from dht11_lcd5.py
+# https://gitlab.com/IOTGarage/iot-lab-book/-/blob/070cf41b33cffdc1f1f90f6a42e1e16215db24be/LAB%2002%20-%20Single-board%20Computer%20Programming/dht11_lcd5.py
+# I have modified the code to take RGB values and text input from arguments rather than from the dht11 sensor.
+# I also added error handling for the RGB values and text input, such as clamping the RGB values to the range of 0-255 and checking if the text input is empty.
+# This means the code can be used to display any text and RGB values on the LCD based on parameters passed by Node-Red, with appropriate debugging capabilities.
+# --------------------------------------------------------------------------
+
 #!/usr/bin/env python3
 import time
 import sys
@@ -32,9 +40,12 @@ def setText(text):
     if not text.strip():
         print("Error: Text input cannot be empty.")
         sys.exit(1)
+    # Clear display
     textCommand(0x01)
     time.sleep(0.05)
+    # Display on, no cursor
     textCommand(0x08 | 0x04)
+    # 2-line display mode
     textCommand(0x28)
     time.sleep(0.05)