Merge pull request #545 from adafruit/Basic_Resistor_Sensor_Reading_on_Raspberry_Pi

Basic resistor sensor reading on raspberry pi

Author: ladyada

Basic_Resistor_Sensor_Reading_on_Raspberry_Pi/Basic_Resistor_Sensor_Reading_on_Raspberry_Pi.py

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+# Example for RC timing reading for Raspberry Pi
+# using CircuitPython Libraries
+
+import time
+import board
+from digitalio import DigitalInOut, Direction
+
+RCpin = board.D18
+
+while True:
+    with DigitalInOut(RCpin) as rc:
+        reading = 0
+
+        # setup pin as output and direction low value
+        rc.direction = Direction.OUTPUT
+        rc.value = False
+
+        time.sleep(0.1)
+
+        # setup pin as input and wait for low value
+        rc.direction = Direction.INPUT
+
+        # This takes about 1 millisecond per loop cycle
+        while rc.value is False:
+            reading += 1
+        print(reading)

Basic_Resistor_Sensor_Reading_on_Raspberry_Pi/README.md

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+# Basic_Resistor_Sensor_Reading_on_Raspberry_Pi
+
+Code to accompany this tutorial:
+https://learn.adafruit.com/basic-resistor-sensor-reading-on-raspberry-pi