Refactor python module structure

control/gpiozero/motor_session.py

@@ -0,0 +1,43 @@
+from gpiozero import Servo, Device
+from gpiozero.pins.pigpio import PiGPIOFactory
+import subprocess
+
+class Motor:
+    def __init__(self, motor_pin=19):
+        subprocess.call(['sudo', 'pigpiod'])
+        Device.pin_factory = PiGPIOFactory()
+        print('Using pin factory:')
+        print(Device.pin_factory)
+        self.set_motor_pin(motor_pin)
+        self.initialise_motor()
+
+    def initialise_motor(self):
+        if self._motor_pin is None:
+            print("Motor pin number is not set.")
+            return
+        self._servo = Servo(self._motor_pin, pin_factory=Device.pin_factory)
+
+    def set_throttle(self, throttle):
+        try:
+            if throttle < -1 or throttle > 1:
+                print("Not setting throttle, invalid value set.")
+                return False
+            self._servo.value = throttle
+        except TypeError:
+            print("throttle should be a number, preferably a float.")
+            return False
+        return True
+
+    def set_motor_pin(self, value):
+        if isinstance(value, int):
+            if value < 2 or value > 21:
+                print("Invalid GPIO pin")
+                return False
+            self._motor_pin = value
+            return True
+        else:
+            print("Value must be an int.")
+            return False
+
+    def stop(self):
+        self.set_throttle(0)