uni_hall: Add example

Signed-off-by: Francois Berder <francois.berder@imgtec.com>

Author: francois-berder

examples/uni_hall_example.py

@@ -0,0 +1,20 @@
+#!/usr/bin/env python3
+"""This example shows how to use the UNI Hall Click binding of LetMeCreate.
+"""
+
+from letmecreate.click import uni_hall
+from letmecreate.core.common import MIKROBUS_1
+from letmecreate.core.gpio_monitor import GPIO_FALLING, GPIO_RAISING
+from time import sleep
+
+
+def print_hello(arg):
+    if arg == GPIO_FALLING:
+        print("Hello, starts dectecting north pole.")
+    elif arg == GPIO_RAISING:
+        print("Hello, stops dectecting north pole.")
+
+uni_hall.attach_callback(MIKROBUS_1, print_hello)
+print("Callback is now active for 15 seconds.")
+print("Move the north pole of a magnet over the sensor to print \"hello\".")
+sleep(15)