From f1d4ca0c05b13acb1afd148533de3fe2c2359db0 Mon Sep 17 00:00:00 2001
From: Ben Nuttall <ben@bennuttall.com>
Date: Mon, 23 Nov 2015 08:36:14 +0000
Subject: [PATCH] Add LineSensor

---
 gpiozero/__init__.py      |  1 +
 gpiozero/input_devices.py | 14 ++++++++++++++
 2 files changed, 15 insertions(+)

diff --git a/gpiozero/__init__.py b/gpiozero/__init__.py
index ae35522..0682763 100644
--- a/gpiozero/__init__.py
+++ b/gpiozero/__init__.py
@@ -14,6 +14,7 @@ from .input_devices import (
     InputDeviceError,
     InputDevice,
     Button,
+    LineSensor,
     MotionSensor,
     LightSensor,
     AnalogInputDevice,
diff --git a/gpiozero/input_devices.py b/gpiozero/input_devices.py
index 18a50b4..7e60ad5 100644
--- a/gpiozero/input_devices.py
+++ b/gpiozero/input_devices.py
@@ -411,6 +411,20 @@ Button.wait_for_press = Button.wait_for_active
 Button.wait_for_release = Button.wait_for_inactive
 
 
+class LineSensor(DigitalInputDevice):
+    """
+    A single sensor line detector.
+    """
+    def __init__(self, pin=None, pull_up=True, bounce_time=None):
+        super(LineSensor, self).__init__(pin, pull_up, bounce_time)
+
+LineSensor.line_detected = LineSensor.is_active
+LineSensor.when_line = LineSensor.when_activated
+LineSensor.when_no_line = LineSensor.when_deactivated
+LineSensor.wait_for_line = LineSensor.wait_for_active
+LineSensor.wait_for_no_line = LineSensor.wait_for_inactive
+
+
 class MotionSensor(SmoothedInputDevice):
     """
     A PIR (Passive Infra-Red) motion sensor.