Add motor control with grpc

MotorControl/gpiozero/motor_session.py

@@ -0,0 +1,40 @@
+import os
+from gpiozero import Servo
+
+GPIOZERO_PIN_FACTORY = "piggpio"
+
+class Motor:
+    def __init__(self, motor_pin=19):
+        os.environ["GPIOZERO_PIN_FACTORY"] = GPIOZERO_PIN_FACTORY
+        os.system("sudo pigpiod")
+        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)
+
+    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
+