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  1. 14
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      README.md
  2. 68
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      code.py
  3. 86
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      lib/teaandtechtime_fft.py

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README.md Bestand weergeven

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+### Spectroshaker
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+
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+This code for [Adafruit Circuit Playgroud Bluefruit](https://learn.adafruit.com/adafruit-circuit-playground-bluefruit)
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+makes the RGB LEDs around it behave in one of two modes (determined by the state of the slider switch):
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+
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+* Spectrogram mode: LEDs are affected by low/mid/high levels of mic input (i.e. respond to music)
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+* Shaker mode: LEDs are affected by x/y/z acceleration (i.e. respond to dancing)
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+
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+[video](https://www.zzzen.com/kraftz/2021-11-19-spectroshaker.webm)
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+
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+#### Note
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+
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+`lib/teaandtechtime_fft.py` comes from the [no-itertools fork](https://github.com/thedod/CircuitPython_FFT/tree/no-itertools) of Thomas Schucker's `CircuitPython_FFT`.
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+It needs to be under the bluefruit's `lib/` folder.

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code.py Bestand weergeven

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+"""
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+Spectroshaker by The Dod:
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+Adafruit CircuitPlayground Bluefruit dual-mode "bling"
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+(selectable via the slider switch).
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+The RGB levels of neopixels around the circuit indicate:
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+- Low/Mid/High sound levels (spectrogram mode)
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+- X/Y/Z acceleration (shaker mode)
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+TO BE CONTINUED ...
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+"""
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+import math
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+import time
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+from adafruit_circuitplayground import cp
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+from teaandtechtime_fft import spectrogram
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+
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+NUM_PIXELS = 10
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+# Like a clock, with connectors at 12 (USB) and 6 (power)
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+LED_ANGLES = [
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+    i*math.pi/6.0
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+    for i in [11, 10, 9, 8, 7, 5, 4, 3, 2, 1]]
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+
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+minx = miny = minz = -5.0
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+maxx = maxy = maxz = 5.0
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+
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+fft_size = 8 # power of 2
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+samples = [0.0+0.0j]*fft_size
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+MAX_2FREQ = 10.0 # After testing this a bit in the wild
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+
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+cp.pixels.brightness = 0.1
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+
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+def angles2level(led, val):
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+    led_angle = LED_ANGLES[led]
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+    val_angle = val * 2.0 * math.pi
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+    angle = led_angle - val_angle
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+    while angle>2*math.pi:
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+        angle -= 2*math.pi
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+    # the pow() makes sin() values sharper
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+    return int(255*pow(math.sin(angle/2), 4))
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+
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+while True:
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+    if cp.button_a:
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+        cp.pixels.brightness = max(0.05, cp.pixels.brightness*0.9)
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+    elif cp.button_b:
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+        cp.pixels.brightness = min(0.95, 1.0-(1.0-cp.pixels.brightness)*0.9)
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+
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+    samples.pop(0)
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+    samples.append(cp.sound_level+0.0j)
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+    x, y, z = cp.acceleration
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+    if x<minx: minx = x
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+    if y<miny: miny = y
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+    if z<minz: minz = z
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+    if x>maxx: maxx = x
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+    if y>maxy: maxy = y
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+    if z>maxx: maxz = z
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+    if cp.switch: # accelerometer mode
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+        vals = (
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+            (x-minx)/(maxx-minx),
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+            (y-miny)/(maxy-miny),
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+            (z-minz)/(maxz-minz))
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+    else: # spectrogram mode
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+        raw_freqs = spectrogram(samples)
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+        pairs = [raw_freqs[i]+raw_freqs[i+1] for i in range(fft_size//2)]
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+        vals = [min(1.0, abs(x/MAX_2FREQ)) for x in pairs[:3]]
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+    for i in range(NUM_PIXELS):
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+        cp.pixels[i] = (
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+            angles2level(i, vals[0]),
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+            angles2level(i, vals[1]),
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+            angles2level(i, vals[2]))
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+    time.sleep(0.01)

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lib/teaandtechtime_fft.py Bestand weergeven

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+# The MIT License (MIT)
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+#
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+# Copyright (c) 2019 Tom Schucker for Tea and Tech Time
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+#
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+# Permission is hereby granted, free of charge, to any person obtaining a copy
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+# of this software and associated documentation files (the "Software"), to deal
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+# in the Software without restriction, including without limitation the rights
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+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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+# copies of the Software, and to permit persons to whom the Software is
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+# furnished to do so, subject to the following conditions:
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+#
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+# The above copyright notice and this permission notice shall be included in
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+# all copies or substantial portions of the Software.
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+#
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+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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+# THE SOFTWARE.
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+"""
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+`teaandtechtime_fft`
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+================================================================================
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+
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+CircuitPython FFT Library
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+
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+* Author(s): Tom Schucker
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+
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+Implementation Notes
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+---------------------
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+This variant comes from @thedod's `no-itertools` fork:
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+https://github.com/thedod/CircuitPython_FFT/tree/no-itertools
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+
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+**Hardware:**
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+
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+**Software and Dependencies:**
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+
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+* Adafruit CircuitPython firmware for the supported boards:
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+  https://github.com/adafruit/circuitpython/releases
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+
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+"""
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+
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+# imports
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+from math import pi, sin, cos, sqrt, pow, log
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+import array
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+
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+__version__ = "0.0.0-auto.0"
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+__repo__ = "https://github.com/tschucker/Teaandtechtime_CircuitPython_FFT.git"
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+
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+#Computes the complex fft of the input array needs to be power of 2 length to work.
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+def fft(x):
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+    N = len(x)
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+    if N <= 1: return x
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+    even = fft([x[i] for i in range(0, N, 2)])
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+    odd =  fft([x[i] for i in range(1, N, 2)])
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+    T = [cos(2*pi*k/N)*odd[k].real+sin(2*pi*k/N)*odd[k].imag + (cos(2*pi*k/N)*odd[k].imag-sin(2*pi*k/N)*odd[k].real)*1j for k in range(N//2)]
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+    return [even[k].real + T[k].real + (even[k].imag + T[k].imag)*1j for k in range(N//2)] + \
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+           [even[k].real - T[k].real + (even[k].imag - T[k].imag)*1j for k in range(N//2)]
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+
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+#Computes the complex inverse fft of the input array needs to be power of 2 length to work
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+#not the most efficiant but uses the same fft code.
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+def ifft(x):
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+    fft_len = float(len(x))
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+    x_swap = []
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+    for s in x:
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+        x_swap.append(s.imag + s.real*1j)
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+    temp = fft(x_swap)
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+    temp_swap = []
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+    for s in temp:
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+        temp_swap.append((s.imag/fft_len) + (s.real/fft_len)*1j)
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+    return temp_swap
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+
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+#Computes the double sided spectrogram of the input array needs to be a power of 2 to work
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+def spectrogram(x):
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+    freq = fft(x)
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+    temp_list = []
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+    for f in freq:
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+        abs_val = abs(f)
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+        if  abs_val != 0.0:
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+            temp_list.append(int(log(abs_val)))
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+        else:
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+            temp_list.append(0)
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+    return temp_list
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+
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+

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