first re-commit.

pigpio-master/EXAMPLES/Python/HALL_EFFECT_SENSOR/README

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+Program to show status changes for a Hall effect sensor.
+

pigpio-master/EXAMPLES/Python/HALL_EFFECT_SENSOR/hall.py

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+#!/usr/bin/env python
+
+import time
+
+import pigpio
+
+#
+# OH3144E or equivalent Hall effect sensor
+#
+# Pin 1 - 5V
+# Pin 2 - Ground
+# Pin 3 - gpio (here P1-8, gpio 14, TXD is used)
+#
+# The internal gpio pull-up is enabled so that the sensor
+# normally reads high.  It reads low when a magnet is close.
+#
+
+HALL=14
+
+pi = pigpio.pi() # connect to local Pi
+
+pi.set_mode(HALL, pigpio.INPUT)
+pi.set_pull_up_down(HALL, pigpio.PUD_UP)
+
+start = time.time()
+
+while (time.time() - start) < 60:
+   print("Hall = {}".format(pi.read(HALL)))
+   time.sleep(0.2)
+
+pi.stop()
+