WIP: add stub for PWM driver using pyserial

pwm_driver.py

@@ -0,0 +1,43 @@
+
+class PWMDriver():
+    def __init__(self, positions : list[tuple[float, float, float]], gcode_size : tuple[float, float], port : str, baudrate : int = 115200) -> None:
+        self.positions = positions
+        self.gcode_size = gcode_size
+        self.port = port
+        self.baudrate = baudrate
+        self._init_pwm()
+
+    def _init_pwm(self) -> None:
+        from serial import Serial
+        pass
+        #self.serial = Serial(self.port, self.baudrate)
+    
+    def _send_position(self, pos : tuple[float, float, float]) -> None:
+        x, y, z = pos
+        # Convert coordinates to PWM values
+        precision = ((2 ** 16) - 1)
+        pwm_x : int = int(x / self.gcode_size[0] * precision)
+        pwm_y : int = int(y / self.gcode_size[1] * precision)
+        pen   : int = 1 if z < 0 else 0
+        
+        # Send PWM values to the serial port
+        print(f"Sending PWM values: X={pwm_x:<5}, Y={pwm_y:<5}, Pen={pen}")
+        #self.serial.write(f"{pwm_x},{pwm_y},{pen}\n".encode())
+
+    def _position_reached(self) -> bool:
+        # Check if the position has been reached
+        from time import sleep
+        sleep(0.5)
+        return True
+        # return self.serial.readline().decode().strip() == "OK"
+    
+    def _wait_for_position(self) -> None:
+        # Wait until the position is reached
+        while not self._position_reached():
+            pass
+    
+    def run(self) -> None:
+        for pos in self.positions:
+            self._send_position(pos)
+            self._wait_for_position()
+        print("All positions sent successfully.")