interpolate between the two colors and return a gamma-corrected
in-between color as a packed 24-bit RGB integer. No bounds clamping
is performed on blend value, be nice."""
inv = 1.0 - blend # Weighting of second color
return gammify([color1[x] * blend + color2[x] * inv for x in range(3)])
# HARDWARE SETUP -----------------------
# Manually declare I2C (not board.I2C() directly) to access 1 MHz speed...
i2c = I2C(board.SCL, board.SDA, frequency=1000000)
# Initialize the IS31 LED driver, buffered for smoother animation
glasses = LED_Glasses(i2c, allocate=adafruit_is31fl3741.MUST_BUFFER)
glasses.show() # Clear any residue on startup
glasses.global_current = 20 # Just middlin' bright, please
# INITIALIZE TABLES & OTHER GLOBALS ----
# This table is for mapping 3x3 averaged bitmap values (0-9) to
# RGB colors. Avoids a lot of shift-and-or on every pixel.
colormap = []
for n in range(10):
colormap.append(gammify([n / 9 * eye_color[x] for x in range(3)]))
# Pre-compute the Y position of 1/2 of the LEDs in a ring, relative
# to the 3X bitmap resolution, so ring & matrix animation can be aligned.
y_pos = []
for n in range(13):
angle = n / 24 * math.pi * 2
# SPDX-FileCopyrightText: 2021 Rose Hooper
# SPDX-License-Identifier: MIT
import board
from adafruit_led_animation.animation.sparkle import Sparkle
from adafruit_led_animation.color import PURPLE
from adafruit_led_animation.sequence import AnimationSequence
from adafruit_is31fl3741.adafruit_ledglasses import MUST_BUFFER, LED_Glasses
from adafruit_is31fl3741.led_glasses_animation import LED_Glasses_Animation
glasses = LED_Glasses(board.I2C(), allocate=MUST_BUFFER)
glasses.set_led_scaling(255)
glasses.global_current = 0xFE
glasses.enable = True
pixels = LED_Glasses_Animation(glasses)
anim2 = Sparkle(pixels, 0.05, PURPLE)
group = AnimationSequence(anim2,
advance_interval=5,
auto_reset=True,
auto_clear=True)
while True:
group.animate()
fft_size = 256 # Sample size for Fourier transform, MUST be power of two
spectrum_size = fft_size // 2 # Output spectrum is 1/2 of FFT result
# Bottom of spectrum tends to be noisy, while top often exceeds musical
# range and is just harmonics, so clip both ends off:
low_bin = 10 # Lowest bin of spectrum that contributes to graph
high_bin = 75 # Highest bin "
# HARDWARE SETUP ---------
# Manually declare I2C (not board.I2C() directly) to access 1 MHz speed...
i2c = I2C(board.SCL, board.SDA, frequency=1000000)
# Initialize the IS31 LED driver, buffered for smoother animation
glasses = LED_Glasses(i2c, allocate=adafruit_is31fl3741.MUST_BUFFER)
glasses.show() # Clear any residue on startup
glasses.global_current = 5 # Not too bright please
# Initialize mic and allocate recording buffer (default rate is 16 MHz)
mic = PDMIn(board.MICROPHONE_CLOCK, board.MICROPHONE_DATA, bit_depth=16)
rec_buf = array("H", [0] * fft_size) # 16-bit audio samples
# FFT/SPECTRUM SETUP -----
# To keep the display lively, tables are precomputed where each column of
# the matrix (of which there are few) is the sum value and weighting of
# several bins from the FFT spectrum output (of which there are many).
# The tables also help visually linearize the output so octaves are evenly
# spaced, as on a piano keyboard, whereas the source spectrum data is
# spaced by frequency in Hz.
column_table = []