Merge branch 'main' of https://git.cardiff.ac.uk/c23072833/cm2305

physical/arduino/arduino1_motor_motionsensor/arduino1_motor_motionsensor.ino

 // --------------------------------------------------------------------------
-// Arduino sketch for controlling a servo motor and reading button presses
+// Arduino sketch for controlling a servo motor and motion sensing
 // 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