Support passive buzzer

config/schema.sql

@@ -86,6 +86,7 @@ INSERT OR IGNORE INTO config VALUES ('unit', 'C', 'select', 'Temperature Unit',
 INSERT OR IGNORE INTO config VALUES ('brewery_name', 'My Home Brewery', 'text', 'Your brewery name', NULL );
 INSERT OR IGNORE INTO config VALUES ('buzzer', 16, 'select', 'Buzzer GPIO', '[16,17,18,19,20]');
 INSERT OR IGNORE INTO config VALUES ('buzzer_beep_level', 'HIGH', 'select', 'Buzzer Logic Beep Level', '["HIGH", "LOW"]');
+INSERT OR IGNORE INTO config VALUES ('buzzer_type', 'ACTIVE', 'select', 'Buzzer type', '["ACTIVE", "PASSIVE"]');
 INSERT OR IGNORE INTO config VALUES ('setup', 'YES', 'select', 'Show the Setup dialog', '["YES","NO"]');
 INSERT OR IGNORE INTO config VALUES ('brew_name', '', 'text', 'Brew Name', NULL);
 INSERT OR IGNORE INTO config VALUES ('donation_notification', 'YES', 'select', 'Disable Donation Notification', '["YES","NO"]');

modules/buzzer/__init__.py

@@ -10,13 +10,16 @@ except Exception as e:
 class Buzzer(object):
 
     sound = ["H", 0.1, "L", 0.1, "H", 0.1, "L", 0.1, "H", 0.1, "L"]
-    def __init__(self, gpio, beep_level):
+    def __init__(self, gpio, buzzer_type, beep_level):
         try:
             cbpi.app.logger.info("INIT BUZZER NOW GPIO%s" % gpio)
             self.gpio = int(gpio)
             self.beep_level = beep_level
+            self.buzzer_type = buzzer_type
             GPIO.setmode(GPIO.BCM)
             GPIO.setup(self.gpio, GPIO.OUT)
+            if buzzer_type == "PASSIVE":
+                self.p = GPIO.PWM(int(gpio), 5000)
             self.state = True
             cbpi.app.logger.info("BUZZER SETUP OK")
         except Exception as e:
@@ -29,19 +32,29 @@ class Buzzer(object):
             return
 
         def play(sound):
+            def output(level):
+                if self.buzzer_type == "PASSIVE" and level == GPIO.LOW:
+                    self.p.stop()
+                elif self.buzzer_type == "PASSIVE":
+                    self.p.start(50)
+                else:
+                    GPIO.output(int(self.gpio), level)
+
             try:
                 for i in sound:
                     if (isinstance(i, str)):
                         if i == "H" and self.beep_level == "HIGH":
-                            GPIO.output(int(self.gpio), GPIO.HIGH)
+                            output(GPIO.HIGH)
                         elif i == "H" and self.beep_level != "HIGH":
-                            GPIO.output(int(self.gpio), GPIO.LOW)
+                            output(GPIO.LOW)
                         elif i == "L" and self.beep_level == "HIGH":
-                            GPIO.output(int(self.gpio), GPIO.LOW)
+                            output(GPIO.LOW)
                         else:
-                            GPIO.output(int(self.gpio), GPIO.HIGH)
+                            output(GPIO.HIGH)
                     else:
                         time.sleep(i)
+                if self.buzzer_type == "PASSIVE":
+                    self.p.stop()
             except Exception as e:
                 pass
 
@@ -51,7 +64,8 @@ class Buzzer(object):
 def init(cbpi):
     gpio = cbpi.get_config_parameter("buzzer", 16)
     beep_level = cbpi.get_config_parameter("buzzer_beep_level", "HIGH")
+    buzzer_type = cbpi.get_config_parameter("buzzer_type", "ACTIVE")
 
-    cbpi.buzzer = Buzzer(gpio, beep_level)
+    cbpi.buzzer = Buzzer(gpio, buzzer_type, beep_level)
     cbpi.beep()
     cbpi.app.logger.info("INIT OK")

update/4_passive_buzzer.sql

@@ -0,0 +1 @@
+INSERT OR IGNORE INTO config VALUES ('buzzer_type', 'ACTIVE', 'select', 'Buzzer type', '["ACTIVE", "PASSIVE"]');