Add sound reader

rpi/hardware/sound/sound.py

@@ -0,0 +1,68 @@
+import time
+import threading
+from typing import Callable
+
+import RPi.GPIO as GPIO
+
+class SoundReader:
+
+    _pin :int
+    _running :bool
+    _thread :threading.Thread | None
+    _subscriber :Callable[[int], None]
+
+    def __init__(self, pin):
+        self._pin = pin
+        self._sound_level = 0
+        self._running = False
+        self._thread = None
+
+        GPIO.setmode(GPIO.BCM)
+        GPIO.setup(self._pin, GPIO.IN)
+
+    def start(self):
+        if not self._running:
+            self._running = True
+            self._thread = threading.Thread(target=self._read, daemon=True)
+            self._thread.start()
+
+    def stop(self):
+        self._running = False
+        if self._thread:
+            self._thread.join()
+        GPIO.cleanup()
+
+    def subscribe(self, handler:Callable[[int], None]):
+        self._subscriber = handler
+
+    def get_level(self):
+        return self._sound_level
+
+    def _notify(self):
+        if self._subscriber:
+            self._subscriber(self._sound_level)
+
+    def _read(self):
+        measure_duration = 0.2
+        interval = 2
+        while self._running:
+            level = 0
+            start = time.time()
+            while time.time() - start < measure_duration:
+                if GPIO.input(self._pin):
+                    level += 1
+            self._sound_level = level
+            time.sleep(interval - measure_duration)
+
+if __name__ == "__main__":
+    sensor = SoundReader(pin=17)
+    sensor.start()
+
+    try:
+        while True:
+            print(f"Approx. Sound Level: {sensor.get_level()}")
+            time.sleep(0.2)
+    except KeyboardInterrupt:
+        print("Exiting...")
+    finally:
+        sensor.stop()