linux: add reset button for hearing aid adjustments

Author: kavishdevar

linux/README.md

@@ -75,4 +75,26 @@ To use hearing aid features, you need to have an audiogram. To enable/disable he
 python3 hearing_aid.py
 ```
 
-The script will load the current settings from the AirPods and allow you to adjust them. You can set the audiogram by providing the values for 8 frequencies (250Hz, 500Hz, 1kHz, 2kHz, 3kHz, 4kHz, 6kHz, 8kHz) for both left and right ears. There are also options to adjust amplification, balance, tone, ambient noise reduction, own voice amplification, and conversation boost.
+The script will load the current settings from the AirPods and allow you to adjust them. You can set the audiogram by providing the values for 8 frequencies (250Hz, 500Hz, 1kHz, 2kHz, 3kHz, 4kHz, 6kHz, 8kHz) for both left and right ears. There are also options to adjust amplification, balance, tone, ambient noise reduction, own voice amplification, and conversation boost.
+
+AirPods check for the DeviceID characteristic to see if the connected device is an Apple device and only then allow hearing aid features. To set the DeviceID characteristic, you need to add this line to your bluetooth configuration file (usually located at `/etc/bluetooth/main.conf`):
+
+```
+DeviceID = bluetooth:004C:0000:0000
+```
+
+Then, restart the bluetooth service:
+
+```bash
+sudo systemctl restart bluetooth
+```
+
+Here, you might need to re-pair your AirPods because they seem to cache this info.
+
+### Troubleshooting
+
+It is possible that the AirPods disconnect after a short period of time and play the disconnect sound. This is likely due to the AirPods expecting some information from an Apple device. Since I have not implemented everything that an Apple device does, the AirPods may disconnect. You don't need to reconnect them manually; the script will handle reconnection automatically for hearing aid features. So, once you are done setting the hearing aid features, change back the `DeviceID` to whatever it was before.
+
+### Why a separate script?
+
+Because I discovered that QBluetooth doesn't support connecting to a socket with its PSM, only a UUID can be used. I could add a dependency on BlueZ, but then having two bluetooth interfaces seems unnecessary. So, I decided to use a separate script for hearing aid features. In the future, QBluetooth will be replaced with BlueZ native calls, and then everything will be in one application.

linux/hearing-aid-adjustments.py

@@ -354,9 +354,12 @@ def init_ui(self):
         self.own_voice_slider = QSlider(Qt.Horizontal)
         self.own_voice_slider.setRange(0, 100)
         self.own_voice_slider.setValue(50)
-        layout.addWidget(QLabel("Own Voice Amplification"))
+        # layout.addWidget(QLabel("Own Voice Amplification"))
         # layout.addWidget(self.own_voice_slider) # seems to have no effect
 
+        # Reset button
+        self.reset_button = QPushButton("Reset")
+        layout.addWidget(self.reset_button)
 
         # Connect signals
         for input_box in self.left_eq_inputs + self.right_eq_inputs:
@@ -367,6 +370,7 @@ def init_ui(self):
         self.anr_slider.valueChanged.connect(self.on_value_changed)
         self.conv_checkbox.stateChanged.connect(self.on_value_changed)
         self.own_voice_slider.valueChanged.connect(self.on_value_changed)
+        self.reset_button.clicked.connect(self.reset_settings)
 
         self.setLayout(layout)
         logging.debug("UI initialized")
@@ -435,6 +439,16 @@ def send_settings(self):
         )
         threading.Thread(target=send_hearing_aid_settings, args=(self.att_manager, settings)).start()
 
+    def reset_settings(self):
+        logging.debug("Resetting settings to defaults")
+        self.amp_slider.setValue(0)
+        self.balance_slider.setValue(0)
+        self.tone_slider.setValue(0)
+        self.anr_slider.setValue(50)
+        self.conv_checkbox.setChecked(False)
+        self.own_voice_slider.setValue(50)
+        self.on_value_changed()
+
     def closeEvent(self, event):
         logging.info("Closing app")
         self.att_manager.disconnect()