Add source/values docs page, close gpiozero#448

Author: bennuttall

docs/examples/combining_sources.py

@@ -0,0 +1,11 @@
+from gpiozero import Button, LED
+from gpiozero.tools import all_values
+from signal import pause
+
+button_a = Button(2)
+button_b = Button(3)
+led = LED(17)
+
+led.source = all_values(button_a.values, button_b.values)
+
+pause()

docs/examples/custom_generator.py

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+from gpiozero import LED
+from random import randint
+from signal import pause
+
+def rand():
+    while True:
+        yield randint(0, 1)
+
+led = LED(17)
+led.source = rand()
+
+pause()

docs/examples/custom_generator_finite.py

@@ -0,0 +1,7 @@
+from gpiozero import LED
+from signal import pause
+
+led = LED(17)
+led.source = [1, 0, 1, 1, 1, 0, 0, 1, 0, 1]
+
+pause()

docs/examples/led_button.py

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+from gpiozero import LED, Button
+from signal import pause
+
+led = LED(17)
+button = Button(2)
+
+led.source = button.values
+
+pause()

docs/examples/led_button_loop.py

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+from gpiozero import LED, Button
+
+led = LED(17)
+button = Button(2)
+
+while True:
+    led.value = button.value

docs/examples/matching_leds.py

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+from gpiozero import LED, Button
+from signal import pause
+
+red = LED(14)
+green = LED(15)
+button = Button(17)
+
+red.source = button.values
+green.source = red.values
+
+pause()

docs/examples/negated.py

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+from gpiozero import Button, LED
+from gpiozero.tools import negated
+from signal import pause
+
+led = LED(4)
+btn = Button(17)
+led.source = negated(btn.values)
+
+pause()

docs/examples/pwmled_pot.py

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+from gpiozero import PWMLED, MCP3008
+from signal import pause
+
+led = PWMLED(17)
+pot = MCP3008()
+
+led.source = pot.values
+
+pause()

docs/examples/random_values.py

@@ -0,0 +1,8 @@
+from gpiozero import PWMLED
+from gpiozero.tools import random_values
+from signal import pause
+
+led = PWMLED(4)
+led.source = random_values()
+
+pause()