sound_sensor_node: add threshold configuration option

doc/sound_sensor_node.md

@@ -0,0 +1,10 @@
+## Configuration
+
+`/etc/sound_sensor_node.toml`:
+```toml
+[node]
+name = "diana"
+pin = "PC0"
+server_addr = "192.168.1.2:8311"
+threshold = 10
+```

src/home/soundsensor/node.py

@@ -16,6 +16,7 @@ class SoundSensorNode:
                  name: str,
                  pinname: str,
                  server_addr: Optional[Addr],
+                 threshold: int = 1,
                  delay=0.005):
 
         if not hasattr(gpioport, pinname):
@@ -24,6 +25,7 @@ class SoundSensorNode:
         self.pin = getattr(gpioport, pinname)
         self.name = name
         self.delay = delay
+        self.threshold = threshold
 
         self.server_addr = server_addr
 
@@ -43,7 +45,7 @@ class SoundSensorNode:
                     hits = self.hits
                     self.hits = 0
 
-                if hits > 0:
+                if hits >= self.threshold:
                     try:
                         if self.server_addr is not None:
                             send_datagram(stringify([self.name, hits]), self.server_addr)

src/sound_sensor_node.py

@@ -27,6 +27,7 @@ if __name__ == '__main__':
 
     node = SoundSensorNode(name=config['node']['name'],
                            pinname=config['node']['pin'],
+                           threshold=config['node']['threshold'] if 'threshold' in config['node'] else 1,
                            server_addr=server_addr,
                            **kwargs)
     node.run()