Added examples for map_range and shift_in/shift_out

examples/map_range_demo.py

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+"""
+'map_range_demo.py'.
+
+=================================================
+maps a number from one range to another
+"""
+import time
+import simpleio
+
+while True:
+    sensor_value = 150
+
+    # Map the sensor's range from 0<=sensor_value<=255 to 0<=sensor_value<=1023
+    print('original sensor value: ', sensor_value)
+    mapped_value = simpleio.map_range(sensor_value, 0, 255, 0, 1023)
+    print('mapped sensor value: ', mapped_value)
+    time.sleep(2)
+
+    # Map the new sensor value back to the old range
+    sensor_value = simpleio.map_range(mapped_value, 0, 1023, 0, 255)
+    print('original value returned: ', sensor_value)
+    time.sleep(2)

examples/shift_in_out_demo.py

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+"""
+'shift_in_out_demo.py'.
+
+=================================================
+shifts data into and out of a data pin
+"""
+
+import time
+import board
+import digitalio
+import simpleio
+
+# set up clock, data, and latch pins
+clk = digitalio.DigitalInOut(board.D12)
+data = digitalio.DigitalInOut(board.D11)
+latch = digitalio.DigitalInOut(board.D10)
+clk.direction = digitalio.Direction.OUTPUT
+latch.direction = digitalio.Direction.OUTPUT
+
+while True:
+    data_to_send = 256
+    # shifting 256 bits out of data pin
+    latch.value = False
+    data.direction = digitalio.Direction.OUTPUT
+    print('shifting out...')
+    simpleio.shift_out(data, clk, data_to_send, msb_first=False)
+    latch.value = True
+    time.sleep(3)
+
+    # shifting 256 bits into the data pin
+    latch.value = False
+    data.direction = digitalio.Direction.INPUT
+    print('shifting in...')
+    simpleio.shift_in(data, clk)
+    time.sleep(3)