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Last minute changes for 1.2

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Warnings about non-physical pins, and period specification for
sin/cosine waves in tools
This commit is contained in:
Dave Jones
2016-04-10 19:29:46 +01:00
parent e2b8171bbb
commit f82ddad1fc
10 changed files with 88 additions and 31 deletions
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34
gpiozero/tools.py
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@@ -16,7 +16,7 @@ try:
except ImportError:
pass
from itertools import cycle
from math import sin, cos, radians
from math import sin, cos, pi
try:
from statistics import mean
except ImportError:
@@ -285,12 +285,11 @@ def random_values():
yield random()
def sin_values():
def sin_values(period=360):
"""
Provides an infinite source of values representing a sine wave (from -1 to
+1), calculated as the result of applying sign to a simple degrees counter
that increments by one for each requested value. For example, to produce a
"siren" effect with a couple of LEDs::
+1) which repeats every *period* values. For example, to produce a "siren"
effect with a couple of LEDs that repeats once a second::
from gpiozero import PWMLED
from gpiozero.tools import sin_values, scaled, inverted
@@ -300,22 +299,22 @@ def sin_values():
blue = PWMLED(3)
red.source_delay = 0.01
blue.source_delay = 0.01
red.source = scaled(sin_values(), 0, 1, -1, 1)
red.source = scaled(sin_values(100), 0, 1, -1, 1)
blue.source = inverted(red.values)
pause()
If you require a wider range than 0 to 1, see :func:`scaled`.
If you require a different range than -1 to +1, see :func:`scaled`.
"""
for d in cycle(range(360)):
yield sin(radians(d))
angles = (2 * pi * i / period for i in range(period))
for a in cycle(angles):
yield sin(a)
def cos_values():
def cos_values(period=360):
"""
Provides an infinite source of values representing a cosine wave (from -1
to +1), calculated as the result of applying sign to a simple degrees
counter that increments by one for each requested value. For example, to
produce a "siren" effect with a couple of LEDs::
to +1) which repeats every *period* values. For example, to produce a
"siren" effect with a couple of LEDs that repeats once a second::
from gpiozero import PWMLED
from gpiozero.tools import cos_values, scaled, inverted
@@ -325,12 +324,13 @@ def cos_values():
blue = PWMLED(3)
red.source_delay = 0.01
blue.source_delay = 0.01
red.source = scaled(cos_values(), 0, 1, -1, 1)
red.source = scaled(cos_values(100), 0, 1, -1, 1)
blue.source = inverted(red.values)
pause()
If you require a wider range than 0 to 1, see :func:`scaled`.
If you require a different range than -1 to +1, see :func:`scaled`.
"""
for d in cycle(range(360)):
yield cos(radians(d))
angles = (2 * pi * i / period for i in range(period))
for a in cycle(angles):
yield cos(a)