adding code for white noise rocket

Adding code and mp3 audio file for the white noise rocket project

White_Noise_Rocket/code.py

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+# SPDX-FileCopyrightText: 2023 Liz Clark for Adafruit Industries
+# SPDX-License-Identifier: MIT
+
+import time
+import board
+import digitalio
+import audiomixer
+import audiomp3
+from audiopwmio import PWMAudioOut as AudioOut
+from adafruit_seesaw import seesaw, rotaryio, digitalio as seesaw_io, neopixel as seesaw_neopixel
+from adafruit_led_animation.animation.pulse import Pulse
+import neopixel
+
+# wait a little bit so USB can stabilize and not glitch audio
+time.sleep(3)
+
+# enable propmaker speaker output
+enable = digitalio.DigitalInOut(board.D10)
+enable.direction = digitalio.Direction.OUTPUT
+enable.value = True
+
+# speaker pin on the propmaker
+audio = AudioOut(board.A0)
+# create mixer instance
+mixer = audiomixer.Mixer(voice_count=1, sample_rate=22050, channel_count=1,
+                         bits_per_sample=16, samples_signed=True)
+# attach mixer to audio playback
+audio.play(mixer)
+
+# open mp3 audio file
+audio_file = audiomp3.MP3Decoder(open("Enceladus_Hiss_NASA.mp3","rb"))
+# play audio file in first channel of mixer
+mixer.voice[0].play(audio_file, loop=True)
+# set mixer channel level
+mixer.voice[0].level = 0
+
+# propmaker neopixel pin
+pixel_pin = board.D5
+num_pixels = 35
+
+pixels = neopixel.NeoPixel(pixel_pin, num_pixels, brightness=0.3, auto_write=False)
+
+# define neopixel colors
+RED = (255, 0, 0)
+BLUE = (0, 0, 255)
+
+# pulse animation
+pulse = Pulse(pixels, speed=0.1, color=RED, period=3)
+
+# i2c setup for rp2040 feather stemma port
+i2c = board.STEMMA_I2C()
+
+# rotary encoder
+enc0 = seesaw.Seesaw(i2c, addr=0x36)
+encoder0 = rotaryio.IncrementalEncoder(enc0)
+last_position0 = None
+
+# encoder button
+enc0.pin_mode(24, enc0.INPUT_PULLUP)
+enc_button = seesaw_io.DigitalIO(enc0, 24)
+enc_button_state = False
+
+# encoder neopixel
+pixel0 = seesaw_neopixel.NeoPixel(enc0, 6, 1)
+pixel0.brightness = 0.2
+pixel0.fill(BLUE)
+
+# variables
+volume = 0 # volume
+pixel_level = 25 # pixel brightness for rings
+last_pos0 = 0 # position of the encoder
+ctrl_mode = 0 # control mode set with encoder
+
+while True:
+    # run neopixel animation
+    pulse.animate()
+    # get encoder position
+    pos0 = -encoder0.position
+
+    # if the encoder button is pressed..
+    if not enc_button.value and not enc_button_state:
+        enc_button_state = True
+        # switch between control modes
+        if ctrl_mode == 0:
+            ctrl_mode = 1
+        else:
+            ctrl_mode = 0
+        print("ctrl_mode is %d" % ctrl_mode)
+    # button debounce
+    if enc_button.value and enc_button_state:
+        enc_button_state = False
+    # if control mode is 0..
+    # control the volume of the white noise
+    if ctrl_mode == 0:
+        # encoder neopixel is blue
+        pixel0.fill(BLUE)
+        # if the encoder moves..
+        if pos0 != last_pos0:
+            # if you increase the encoder
+            # increase value by 0.1
+            # maxed out at 1
+            if pos0 > last_pos0:
+                volume = volume + 0.1
+                if volume > 1:
+                    volume = 1
+            # if you decrease
+            # decrease value by 0.1
+            # minimum value of 0
+            if pos0 < last_pos0:
+                volume = volume - 0.1
+                if volume < 0:
+                    volume = 0
+            print(volume)
+            # reset the position
+            last_pos0 = pos0
+    # if control mode is 1..
+    # control the brightness of the neopixel rings
+    # actually controlling the % of red, not brightness directly
+    if ctrl_mode == 1:
+        # set the encoder neopixel to red
+        pixel0.fill(RED)
+        # if you increase the encoder
+        # increase value by 10
+        # max out at 255
+        if pos0 != last_pos0:
+            if pos0 > last_pos0:
+                pixel_level = pixel_level + 10
+                if pixel_level > 255:
+                    pixel_level = 255
+            # if you decrease the encoder
+            # decrease value by 10
+            # minimum level of 25
+            if pos0 < last_pos0:
+                pixel_level = pixel_level - 10
+                if pixel_level < 25:
+                    pixel_level = 25
+            print(pixel_level)
+            # reset the position
+            last_pos0 = pos0
+    # set the neopixel ring color
+    pulse.color = (pixel_level, 0, 0)
+    # set the audio volume
+    mixer.voice[0].level = volume