old_contents: import serial
  import time
  
  # Define Constants
  SERIAL_DEVICE = "/dev/tty.usbmodem1421"
  
  # Establish Connection
  ser = serial.Serial(SERIAL_DEVICE, 9600)
  time.sleep(2)
  print("Connection Established");
  
  # Send Data to Pi
  ser.write('h')
  time.sleep(5);
  ser.write('l')
  
new_contents: import serial
  import time
  
  # Define Constants
  SERIAL_DEVICE = "/dev/ttyACM0"
  
  # Establish Connection
  ser = serial.Serial(SERIAL_DEVICE, 9600)
  time.sleep(2)
  print("Connection Established");
  
  # Send Data to Pi
  ser.write('h')
  time.sleep(5);
  ser.write('l')
  
subject: Update SERIAL_DEVICE to match the Raspberry Pi