diff --git a/RaspberryPi&JetsonNano/python/examples/keys.py b/RaspberryPi&JetsonNano/python/examples/keys.py
new file mode 100644
index 0000000..bb9a8b3
--- /dev/null
+++ b/RaspberryPi&JetsonNano/python/examples/keys.py
@@ -0,0 +1,34 @@
+import RPi.GPIO as GPIO
+import time
+
+GPIO.setmode(GPIO.BCM)
+
+key1 = 5
+key2 = 6
+key3 = 13
+key4 = 19
+
+GPIO.setup(key1, GPIO.IN, pull_up_down=GPIO.PUD_UP)
+GPIO.setup(key2, GPIO.IN, pull_up_down=GPIO.PUD_UP)
+GPIO.setup(key3, GPIO.IN, pull_up_down=GPIO.PUD_UP)
+GPIO.setup(key4, GPIO.IN, pull_up_down=GPIO.PUD_UP)
+
+
+def interrupt(channel):
+    print("interrupt", channel)
+
+
+GPIO.add_event_detect(key1, GPIO.FALLING, callback=interrupt, bouncetime=200)
+GPIO.add_event_detect(key2, GPIO.FALLING, callback=interrupt, bouncetime=200)
+GPIO.add_event_detect(key3, GPIO.FALLING, callback=interrupt, bouncetime=200)
+GPIO.add_event_detect(key4, GPIO.FALLING, callback=interrupt, bouncetime=200)
+
+tic = 0
+try:
+    while True:
+        tic = tic + 1
+        print("Tic %d" % tic)
+        time.sleep(1)
+except KeyboardInterrupt:
+    GPIO.cleanup()
+    print("\nBye")