Delete led.py
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python/led.py
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python/led.py
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from __future__ import print_function
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from __future__ import division
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import platform
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import numpy as np
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import config
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# ESP8266 uses WiFi communication
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if config.DEVICE == 'esp8266':
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import socket
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_sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
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# Raspberry Pi controls the LED strip directly
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elif config.DEVICE == 'pi':
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import neopixel
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strip = neopixel.Adafruit_NeoPixel(config.N_PIXELS, config.LED_PIN,
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config.LED_FREQ_HZ, config.LED_DMA,
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config.LED_INVERT, config.BRIGHTNESS)
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strip.begin()
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elif config.DEVICE == 'blinkstick':
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from blinkstick import blinkstick
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import signal
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import sys
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#Will turn all leds off when invoked.
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def signal_handler(signal, frame):
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all_off = [0]*(config.N_PIXELS*3)
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stick.set_led_data(0, all_off)
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sys.exit(0)
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stick = blinkstick.find_first()
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# Create a listener that turns the leds off when the program terminates
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signal.signal(signal.SIGTERM, signal_handler)
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signal.signal(signal.SIGINT, signal_handler)
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_gamma = np.load(config.GAMMA_TABLE_PATH)
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"""Gamma lookup table used for nonlinear brightness correction"""
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_prev_pixels = np.tile(253, (3, config.N_PIXELS))
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"""Pixel values that were most recently displayed on the LED strip"""
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pixels = np.tile(1, (3, config.N_PIXELS))
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"""Pixel values for the LED strip"""
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_is_python_2 = int(platform.python_version_tuple()[0]) == 2
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def _update_esp8266():
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"""Sends UDP packets to ESP8266 to update LED strip values
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The ESP8266 will receive and decode the packets to determine what values
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to display on the LED strip. The communication protocol supports LED strips
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with a maximum of 256 LEDs.
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The packet encoding scheme is:
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|i|r|g|b|
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where
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i (0 to 255): Index of LED to change (zero-based)
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r (0 to 255): Red value of LED
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g (0 to 255): Green value of LED
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b (0 to 255): Blue value of LED
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"""
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global pixels, _prev_pixels
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# Truncate values and cast to integer
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pixels = np.clip(pixels, 0, 255).astype(int)
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# Optionally apply gamma correc tio
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p = _gamma[pixels] if config.SOFTWARE_GAMMA_CORRECTION else np.copy(pixels)
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MAX_PIXELS_PER_PACKET = 126
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# Pixel indices
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idx = range(pixels.shape[1])
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idx = [i for i in idx if not np.array_equal(p[:, i], _prev_pixels[:, i])]
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n_packets = len(idx) // MAX_PIXELS_PER_PACKET + 1
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idx = np.array_split(idx, n_packets)
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for packet_indices in idx:
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m = '' if _is_python_2 else []
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for i in packet_indices:
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if _is_python_2:
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m += chr(i) + chr(p[0][i]) + chr(p[1][i]) + chr(p[2][i])
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else:
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m.append(i) # Index of pixel to change
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m.append(p[0][i]) # Pixel red value
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m.append(p[1][i]) # Pixel green value
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m.append(p[2][i]) # Pixel blue value
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m = m if _is_python_2 else bytes(m)
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_sock.sendto(m, (config.UDP_IP, config.UDP_PORT))
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_prev_pixels = np.copy(p)
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def _update_pi():
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"""Writes new LED values to the Raspberry Pi's LED strip
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Raspberry Pi uses the rpi_ws281x to control the LED strip directly.
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This function updates the LED strip with new values.
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"""
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global pixels, _prev_pixels
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# Truncate values and cast to integer
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pixels = np.clip(pixels, 0, 255).astype(int)
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# Optional gamma correction
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p = _gamma[pixels] if config.SOFTWARE_GAMMA_CORRECTION else np.copy(pixels)
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# Encode 24-bit LED values in 32 bit integers
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r = np.left_shift(p[0][:].astype(int), 8)
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g = np.left_shift(p[1][:].astype(int), 16)
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b = p[2][:].astype(int)
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rgb = np.bitwise_or(np.bitwise_or(r, g), b)
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# Update the pixels
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for i in range(config.N_PIXELS):
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# Ignore pixels if they haven't changed (saves bandwidth)
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if np.array_equal(p[:, i], _prev_pixels[:, i]):
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continue
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strip._led_data[i] = rgb[i]
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_prev_pixels = np.copy(p)
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strip.show()
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def _update_blinkstick():
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"""Writes new LED values to the Blinkstick.
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This function updates the LED strip with new values.
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"""
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global pixels
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# Truncate values and cast to integer
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pixels = np.clip(pixels, 0, 255).astype(int)
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# Optional gamma correction
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p = _gamma[pixels] if config.SOFTWARE_GAMMA_CORRECTION else np.copy(pixels)
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# Read the rgb values
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r = p[0][:].astype(int)
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g = p[1][:].astype(int)
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b = p[2][:].astype(int)
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#create array in which we will store the led states
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newstrip = [None]*(config.N_PIXELS*3)
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for i in range(config.N_PIXELS):
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# blinkstick uses GRB format
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newstrip[i*3] = g[i]
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newstrip[i*3+1] = r[i]
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newstrip[i*3+2] = b[i]
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#send the data to the blinkstick
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stick.set_led_data(0, newstrip)
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def update():
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"""Updates the LED strip values"""
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if config.DEVICE == 'esp8266':
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_update_esp8266()
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elif config.DEVICE == 'pi':
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_update_pi()
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elif config.DEVICE == 'blinkstick':
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_update_blinkstick()
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else:
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raise ValueError('Invalid device selected')
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# Execute this file to run a LED strand test
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# If everything is working, you should see a red, green, and blue pixel scroll
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# across the LED strip continously
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if __name__ == '__main__':
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import time
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# Turn all pixels off
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pixels *= 0
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pixels[0, 0] = 255 # Set 1st pixel red
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pixels[1, 1] = 255 # Set 2nd pixel green
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pixels[2, 2] = 255 # Set 3rd pixel blue
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print('Starting LED strand test')
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while True:
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pixels = np.roll(pixels, 1, axis=1)
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update()
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time.sleep(.1)
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