diff --git a/rosys/hardware/__init__.py b/rosys/hardware/__init__.py
index f11e4997..827cd911 100644
--- a/rosys/hardware/__init__.py
+++ b/rosys/hardware/__init__.py
@@ -4,6 +4,7 @@
 from .bumper import Bumper, BumperHardware, BumperSimulation
 from .can import CanHardware
 from .communication import Communication, SerialCommunication, WebCommunication
+from .esp_pins import EspPins
 from .estop import EStop, EStopHardware, EStopSimulation
 from .expander import ExpanderHardware
 from .imu import Imu, ImuHardware, ImuSimulation
@@ -26,6 +27,7 @@
     'Communication',
     'SerialCommunication',
     'WebCommunication',
+    'EspPins',
     'EStop',
     'EStopHardware',
     'EStopSimulation',
diff --git a/rosys/hardware/communication/serial_communication.py b/rosys/hardware/communication/serial_communication.py
index 666c5bf7..7567d9d0 100644
--- a/rosys/hardware/communication/serial_communication.py
+++ b/rosys/hardware/communication/serial_communication.py
@@ -24,9 +24,9 @@ class SerialCommunication(Communication):
         '/dev/ttyUSB0',
     ]
 
-    def __init__(self, baud_rate: int = 115200) -> None:
+    def __init__(self, *, device_path: str | None = None, baud_rate: int = 115200) -> None:
         super().__init__()
-        self.device_path = self.get_device_path()
+        self.device_path = self.get_device_path() if device_path is None else device_path
         if self.device_path is None:
             raise FileNotFoundError('No serial port found')
         self.log.debug('connecting serial on %s with baud rate %s', self.device_path, baud_rate)
diff --git a/rosys/hardware/esp_pins.py b/rosys/hardware/esp_pins.py
new file mode 100644
index 00000000..863ced96
--- /dev/null
+++ b/rosys/hardware/esp_pins.py
@@ -0,0 +1,116 @@
+from __future__ import annotations
+
+from dataclasses import dataclass
+from typing import TYPE_CHECKING
+
+from nicegui import ui
+from nicegui.elements.mixins.value_element import ValueElement
+
+if TYPE_CHECKING:
+    from .robot_brain import RobotBrain
+
+
+class StatusBulb(ValueElement):
+    def __init__(self, value: bool = False) -> None:
+        super().__init__(value=value, on_value_change=self.on_change, tag='span')
+        self.style('height: 15px; width: 15px; margin: auto; border-radius: 50%')
+        self.on_change()
+
+    def on_change(self) -> None:
+        self.style('background: radial-gradient(circle at 5px 5px, #5898D4, #4682B4);' if self.value
+                   else 'background: radial-gradient(circle at 5px 5px, #D3D3D3, #A9A9A9);')
+
+
+@dataclass(slots=True, kw_only=True)
+class GpioPin:
+    gpio: int
+    level: bool = False
+    is_input: bool = False
+    is_output: bool = False
+    open_drain: bool = False
+    is_pullup: bool = False
+    is_pulldown: bool = False
+    drive_strength: int = 0
+    sleep_sel: int = 0
+
+
+class EspPins:
+    """Monitor and control ESP32 GPIO pins."""
+
+    def __init__(self, name: str, robot_brain: RobotBrain) -> None:
+        self.name = name
+        self.robot_brain = robot_brain
+        _pin_numbers: list[int] = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
+                                   10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
+                                   21, 22, 23, 25, 26, 27,
+                                   32, 33, 34, 35, 36, 37, 38, 39]
+        self._pins: dict[int, GpioPin] = {pin: GpioPin(gpio=pin) for pin in _pin_numbers}
+
+    async def update_pin(self, pin: GpioPin) -> None:
+        ack = f'GPIO_Status[{pin.gpio}]|' if self.name == 'core' else f'{self.name}:'
+        line = await self.robot_brain.send_and_await(f'{self.name}.get_pin_status({pin.gpio})', ack, timeout=1.0)
+        if line is None:
+            raise TimeoutError(f'No response from {self.name} for pin {pin.gpio}')
+
+        # GPIO_Status[3]| Level: 1| InputEn: 1| OutputEn: 0| OpenDrain: 0| Pullup: 1| Pulldown: 0| DriveStrength: 2| SleepSel: 0
+        # p0: GPIO_Status[0]| Level: 1| InputEn: 1| OutputEn: 0| OpenDrain: 0| Pullup: 1| Pulldown: 0| DriveStrength: 2| SleepSel: 0
+        status_dict = {}
+        for part in line.split('|')[1:]:
+            key, value = part.strip().split(': ')
+            status_dict[key.strip()] = int(value.strip())
+
+        pin.level = bool(status_dict.get('Level', 0))
+        pin.is_input = bool(status_dict.get('InputEn', 0))
+        pin.is_output = bool(status_dict.get('OutputEn', 0))
+        pin.open_drain = bool(status_dict.get('OpenDrain', 0))
+        pin.is_pullup = bool(status_dict.get('Pullup', 0))
+        pin.is_pulldown = bool(status_dict.get('Pulldown', 0))
+        pin.drive_strength = int(status_dict.get('DriveStrength', 0))
+        pin.sleep_sel = int(status_dict.get('SleepSel', 0))
+
+    async def update_all(self) -> None:
+        for pin in self._pins.values():
+            await self.update_pin(pin)
+
+    async def set_pin_level(self, pin: GpioPin, level: bool) -> None:
+        await self.robot_brain.send(f'{self.name}.set_pin_level({pin.gpio}, {1 if level else 0})')
+
+    def developer_ui(self) -> None:
+        with ui.column():
+            with ui.row().classes('w-full'):
+                ui.markdown(f'**ESP: {self.name}**')
+                ui.space()
+                ui.button(icon='refresh', on_click=self.update_all).props('flat round dense').tooltip('Update once')
+            ui.separator()
+            with ui.grid(columns=5):
+                for pin in self._pins.values():
+                    with ui.row():
+                        ui.label(f'GPIO {str(pin.gpio).zfill(2)}')
+                        with StatusBulb().bind_value_from(pin, 'level'):
+                            self._pin_context_menu(pin)
+
+    def _pin_context_menu(self, pin: GpioPin) -> None:
+        with ui.context_menu().props('auto-close=false') as context_menu:
+            with ui.card():
+                with ui.row().classes('w-full'):
+                    ui.label(f'GPIO {pin.gpio}')
+                    ui.space()
+                    ui.button(icon='refresh', on_click=lambda pin=pin: self.update_pin(pin)) \
+                        .props('size=sm flat dense').tooltip('Update gpio state')
+                    ui.button(icon='check_circle', on_click=lambda pin=pin: self.set_pin_level(pin, True)) \
+                        .props('size=sm flat dense').tooltip('Set output to HIGH')
+                    ui.button(icon='unpublished', on_click=lambda pin=pin: self.set_pin_level(pin, False)) \
+                        .props('size=sm flat dense').tooltip('Set output to LOW')
+                    ui.space()
+                    ui.button(icon='close', on_click=context_menu.close) \
+                        .props('color=black size=sm flat dense')
+                ui.separator()
+                with ui.grid(columns=2):
+                    ui.label().bind_text_from(pin, 'level', lambda level: f'Level: {"High" if level else "Low"}')
+                    ui.label().bind_text_from(pin, 'is_input', lambda is_input: f'Input: {is_input}')
+                    ui.label().bind_text_from(pin, 'is_output', lambda is_output: f'Output: {is_output}')
+                    ui.label().bind_text_from(pin, 'open_drain', lambda open_drain: f'OpenDrain: {open_drain}')
+                    ui.label().bind_text_from(pin, 'is_pullup', lambda is_pullup: f'PullUp: {is_pullup}')
+                    ui.label().bind_text_from(pin, 'is_pulldown', lambda is_pulldown: f'PullDown: {is_pulldown}')
+                    ui.label().bind_text_from(pin, 'drive_strength', lambda strength: f'Drive Strength: {strength}')
+                    ui.label().bind_text_from(pin, 'sleep_sel', lambda sleep_sel: f'Sleep Sel: {sleep_sel}')