blink1 0.3.1

About this library

Features of this library:

• Test coverage on all library components

• Python 3.x and Python 2.7.x compatible

• Automatic installation via Python Package Index

• High level control over the blink(1)

• Single implementation with cython-hidapi USB HID API (PyUSB cannot access HID devices on all OSes)

This library lives at https://github.com/todbot/blink1-python

Originally written by @salimfadhley, at https://github.com/salimfadhley/blink1/tree/master/python/pypi. Moved to this repository and rewritten for cython-hidapi by @todbot.

Installation

Use the pip utility to fetch the latest release of this package and any additional components required in a single step:

pip install blink1

Example Code and Installed scripts

Two command-line scripts blink1-shine and blink1-flash are installed when this library is installed. * blink1-shine – Tell the blink(1) to be specifc steady color * blink1-flash – Flash the blink(1) two different colors at a specific rate

For examples, see the `blink1_demo <./blink1_demo/>`__ directory for several examples on how to use this library.

OS-specific notes

The blink1-python library relies on cython-hidapi for USB HID access. This package may require a C compiler and attendant utilities to be installed before installing this library.

sudo apt-get install python-dev libusb-1.0-0-dev libudev-dev

echo 'SUBSYSTEM=="usb", ATTRS{idVendor}=="27b8", ATTRS{idProduct}=="01ed", MODE:="666", GROUP="plugdev"' | sudo tee /etc/udev/rules.d/51-blink1.rules
sudo udevadm control --reload
sudo udevadm trigger

Use

The simplest way to use this library is via a context manager.

import time
from blink1.blink1 import blink1

with blink1() as b1:
  b1.fade_to_color(100, 'navy')
  time.sleep(10)

When the blink1() block exits the light is automatically switched off. It is also possible to access the exact same set of functions without the context manager:

import time
from blink1.blink1 import Blink1

b1 = Blink1()
b1.fade_to_rgb(1000, 64, 64, 64)
time.sleep(3)
b1.fade_to_rgb(1000, 255, 255, 255)

Unlike the context manager, this demo will leave the blink(1) open at the end of execution. To close it, use the b1.close() method.

To list all connected blink(1) devices:

from blink1.blink1 import Blink1
blink1_serials = Blink1.list()
print("blink(1) devices found: " + ','.join(blink1_serials))

To open a particular blink(1) device by serial number, pass in its serial number as a Unicode string:

from blink1.blink1 import blink1
blink1 = Blink1(serial_number=u'20002345')
blink1.fade_to_rgb(1000, 255,0,255)
blink1.close()

blink1.fade_to_color(1000, '#ffffff') # Hexdecimal RGB as a string
blink1.fade_to_color(1000, 'green') # Named color - any color name understood by css3
blink1.fade_to_color(1000, (22,33,44) # RGB as a tuple. Luminance values are 0 <= lum <= 255

blink1.play()  # play entire color pattern, infinitely looped
blink1.stop()  # stop a color pattern playing (if playing)

blink1.play(2,3, count=7)  # play color pattern lines 2,3 in a loop 7 times

# write 100msec fades to green then yellow then black at lines 3,4,5
blink1.write_pattern_line( 100, 'green',  3)
blink1.write_pattern_line( 100, 'yellow', 4)
blink1.write_pattern_line( 100, 'black',  5)

blink1.play( 3,5, 4)  # play that sub-loop 4 times

blink1.savePattern()

# play purple on LED1 in 300ms, green on LED2 in 100ms, then swap, for 10 times
pattern_str = '10, #ff00ff,0.3,1, #00ff00,0.1,2,  #ff00ff,0.3,2, #00ff00,0.1,1'
blink1.play_pattern(pattern_str)
# wait 5 seconds while the pattern plays on the blink1
# (or go do something more useful)
time.sleep(5.0)
# flash red-off 5 times fast on all LEDs
blink1.play_pattern('5, #FF0000,0.2,0,#000000,0.2,0')

blink1.server_tickle(enable=True, timeout_millis=2000)

from blink1.blink1 import blink1

with blink1(gamma=(2, 2, 2)) as b1:
  b1.fade_to_color(100, 'pink')
  time.sleep(10)

with blink1(white_point='candle', switch_off) as b1:
  b1.fade_to_color(100, 'white')

API reference

Help on class Blink1 in blink1.blink1:

blink1.blink1.Blink1 = class Blink1
 |  Light controller class, sends messages to the blink(1) via USB HID.
 |
 |  Methods defined here:
 |
 |  __init__(self, serial_number=None, gamma=None, white_point=None)
 |      :param serial_number: serial number of blink(1) to open, otherwise first found
 |      :param gamma: Triple of gammas for each channel e.g. (2, 2, 2)
 |
 |  clear_pattern(self)
 |      Clear entire color pattern in blink(1)
 |      :raises: Blink1ConnectionFailed: if blink(1) is disconnected
 |
 |  close(self)
 |
 |  fade_to_color(self, fade_milliseconds, color, ledn=0)
 |      Fade the light to a known colour
 |      :param fade_milliseconds: Duration of the fade in milliseconds
 |      :param color: Named color to fade to (e.g. "#FF00FF", "red")
 |      :param ledn: which led to control
 |      :raises: Blink1ConnectionFailed: if blink(1) is disconnected
 |
 |  fade_to_rgb(self, fade_milliseconds, red, green, blue, ledn=0)
 |      Command blink(1) to fade to RGB color
 |      :param fade_milliseconds: millisecs duration of fade
 |      :param red: 0-255
 |      :param green: 0-255
 |      :param blue: 0-255
 |      :param ledn: which LED to control (0=all, 1=LED A, 2=LED B)
 |      :raises: Blink1ConnectionFailed: if blink(1) is disconnected
 |
 |  fade_to_rgb_uncorrected(self, fade_milliseconds, red, green, blue, ledn=0)
 |      Command blink(1) to fade to RGB color, no color correction applied.
 |      :raises: Blink1ConnectionFailed if blink(1) is disconnected
 |
 |  get_serial_number(self)
 |      Get blink(1) serial number
 |      :return blink(1) serial number as string
 |      :raises: Blink1ConnectionFailed: if blink(1) is disconnected
 |
 |  get_version(self)
 |      Get blink(1) firmware version
 |      :raises: Blink1ConnectionFailed: if blink(1) is disconnected
 |
 |  notfound(self)
 |
 |  off(self)
 |      Switch the blink(1) off instantly
 |      :raises: Blink1ConnectionFailed: if blink(1) is disconnected
 |
 |  play(self, start_pos=0, end_pos=0, count=0)
 |      Play internal color pattern
 |      :param start_pos: pattern line to start from
 |      :param end_pos: pattern line to end at
 |      :param count: number of times to play, 0=play forever
 |      :raises: Blink1ConnectionFailed: if blink(1) is disconnected
 |
 |  play_pattern(self, pattern_str, onDevice=True)
 |      Play a Blink1Control-style pattern string
 |      :param pattern_str: The Blink1Control-style pattern string to play
 |      :param onDevice: True (default) to run pattern on blink(1),
 |                       otherwise plays in Python process
 |      :raises: Blink1ConnectionFailed: if blink(1) is disconnected
 |
 |  play_pattern_local(self, pattern_str)
 |      Play a Blink1Control pattern string in Python process
 |          (plays in blink1-python, so blocks)
 |      :param pattern_str: The Blink1Control-style pattern string to play
 |      :raises: Blink1ConnectionFailed: if blink(1) is disconnected
 |
 |  read(self)
 |      Read command result from blink(1), low-level internal use
 |      Receive USB Feature Report 0x01 from blink(1) with 8-byte payload
 |      Note: buf must be 8 bytes or bad things happen
 |
 |  read_pattern(self)
 |      Read the entire color pattern
 |      :return List of pattern line tuples
 |      :raises: Blink1ConnectionFailed: if blink(1) is disconnected
 |
 |  read_pattern_line(self, pos)
 |      Read a color pattern line at position
 |      :param pos: pattern line to read
 |      :return pattern line data as tuple (r,g,b, step_millis) or False on err
 |      :raises: Blink1ConnectionFailed: if blink(1) is disconnected
 |
 |  save_pattern(self)
 |      Save internal RAM pattern to flash
 |      :raises: Blink1ConnectionFailed: if blink(1) is disconnected
 |
 |  server_tickle(self, enable, timeout_millis=0, stay_lit=False, start_pos=0, end_pos=16)
 |      Enable/disable servertickle / serverdown watchdog
 |      :param: enable: Set True to enable serverTickle
 |      :param: timeout_millis: millisecs until servertickle is triggered
 |      :param: stay_lit: Set True to keep current color of blink(1), False to turn off
 |      :param: start_pos: Sub-pattern start position in whole color pattern
 |      :param: end_pos: Sub-pattern end position in whole color pattern
 |      :raises: Blink1ConnectionFailed: if blink(1) is disconnected
 |
 |  set_ledn(self, ledn=0)
 |      Set the 'current LED' value for writePatternLine
 |      :param ledn: LED to adjust, 0=all, 1=LEDA, 2=LEDB
 |      :raises: Blink1ConnectionFailed: if blink(1) is disconnected
 |
 |  stop(self)
 |      Stop internal color pattern playing
 |      :raises: Blink1ConnectionFailed: if blink(1) is disconnected
 |
 |  write(self, buf)
 |      Write command to blink(1), low-level internal use
 |      Send USB Feature Report 0x01 to blink(1) with 8-byte payload
 |      Note: arg 'buf' must be 8 bytes or bad things happen
 |      :raises: Blink1ConnectionFailed if blink(1) is disconnected
 |
 |  write_pattern_line(self, step_milliseconds, color, pos, ledn=0)
 |      Write a color & step time color pattern line to RAM
 |      :param step_milliseconds: how long for this pattern line to take
 |      :param color: LED color
 |      :param pos: color pattern line number (0-15)
 |      :param ledn: LED number to adjust, 0=all, 1=LEDA, 2=LEDB
 |      :raises: Blink1ConnectionFailed: if blink(1) is disconnected
 |
 |  ----------------------------------------------------------------------
 |  Static methods defined here:
 |
 |  color_to_rgb(color)
 |      Convert color name or hexcode to (r,g,b) tuple
 |      :param color: a color string, e.g. "#FF00FF" or "red"
 |      :raises: InvalidColor: if color string is bad
 |
 |  find(serial_number=None)
 |      Find a praticular blink(1) device, or the first one
 |      :param serial_number: serial number of blink(1) device (from Blink1.list())
 |      :raises: Blink1ConnectionFailed: if blink(1) is not present
 |
 |  list()
 |      List blink(1) devices connected, by serial number
 |      :return: List of blink(1) device serial numbers
 |
 |  parse_pattern(pattern_str)
 |      Parse a Blink1Control pattern string to a list of pattern lines
 |          e.g. of the form '10,#ff00ff,0.1,0,#00ff00,0.1,0'
 |      :param pattern_str: The Blink1Control-style pattern string to parse
 |      :returns: an list of dicts of the parsed out pieces

Developer installation

Having checked out the blink1-python library, cd to its directory and run the setup script:

git clone https://github.com/todbot/blink1-python
cd blink1-python
python3 setup.py develop
python3 ./blink1_demo/demo1.py

or

pip3 install --editable .

You can now use the blink1 package on your system and edit it.

To get internal blink1 library debug, messages set the environment variable DEBUGBLINK1:

DEBUGBLINK1=1 python3 ./blink1_demo/demo1.py

To uninstall the development version:

python3 setup.py develop --uninstall