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stopwatch.py

+import machine
+import utime
+
+start = machine.Pin(20, machine.Pin.IN, machine.Pin.PULL_UP)
+stop = machine.Pin(21, machine.Pin.IN, machine.Pin.PULL_UP)
+buzzer_pin = machine.Pin(18, machine.Pin.OUT)
+
+
+while True:
+    
+    while start.value() == 1:
+        utime.sleep_ms(10)
+    startTime = utime.ticks_ms()
+    
+    print("Start timer")
+
+
+    while stop.value() == 1:
+        utime.sleep_ms(10)
+    stopTime = utime.ticks_ms()
+    buzzer_pin.value(1)
+    utime.sleep(0.5)
+    buzzer_pin.value(0)
+    
+    print("Timer stopped")
+
+    
+    time = stopTime - startTime
+    timeInSecs = time / 1000
+    print("Stopwatch time:", timeInSecs, "s")