Sounds the piezo alarm when the vibration switch is disturbed

initial commit

GemmaM0_Vibration_Switch_Motion_Alarm/main.py

@@ -0,0 +1,29 @@
+# Motion Sensor Alarm
+# uses Gemma M0, vibration sensor on A0/GND, & piezo on D0/GND
+import pulseio
+from digitalio import DigitalInOut, Direction, Pull
+from analogio import AnalogIn
+import board
+import time
+
+piezo = pulseio.PWMOut(board.D0, duty_cycle=0, frequency=440,
+                       variable_frequency=True)
+
+vibrationPin = AnalogIn(board.A0)
+
+def get_voltage(pin):
+    return (pin.value * 3.3) / 65536
+
+while True:
+    print((get_voltage(vibrationPin),))
+    vibration = get_voltage(vibrationPin)
+
+    if vibration < 1:  # the sensor has been tripped, you can adjust this value
+                       # for sensitivity
+        for f in (2620, 4400, 2620, 4400, 2620, 4400, 2620, 4400):
+            piezo.frequency = f
+            piezo.duty_cycle = 65536//2  # on 50%
+            time.sleep(0.2)  # on 1/5 second
+            piezo.duty_cycle = 0  # off
+            time.sleep(0.02)  # pause
+    time.sleep(0.01)  # debounce delay