MAX98357 code and fritzings

Author: kattni

Adafruit_MAX98357/CircuitPython_I2S_Tone.py

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+import time
+import array
+import math
+import audioio
+import board
+import audiobusio
+
+tone_volume = 0.1  # Increase this to increase the volume of the tone.
+frequency = 440  # Set this to the Hz of the tone you want to generate.
+length = 8000 // frequency
+sine_wave = array.array("H", [0] * length)
+for i in range(length):
+    sine_wave[i] = int((1 + math.sin(math.pi * 2 * i / 18)) * tone_volume * (2 ** 15))
+
+# For Feather M0 Express, ItsyBitsy M0 Express, Metro M0 Express
+audio = audiobusio.I2SOut(board.D1, board.D0, board.D9)
+# For Feather M4 Express
+# audio = audiobusio.I2SOut(board.D1, board.D10, board.D11)
+# For Metro M4 Express
+# audio = audiobusio.I2SOut(board.D3, board.D9, board.D8)
+sine_wave_sample = audioio.RawSample(sine_wave)
+
+while True:
+    audio.play(sine_wave_sample, loop=True)
+    time.sleep(1)
+    audio.stop()
+    time.sleep(1)

Adafruit_MAX98357/CircuitPython_I2S_Wave.py

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+import audioio
+import board
+import audiobusio
+
+wave_file = open("StreetChicken.wav", "rb")
+wave = audioio.WaveFile(wave_file)
+
+# For Feather M0 Express, ItsyBitsy M0 Express, Metro M0 Express
+audio = audiobusio.I2SOut(board.D1, board.D0, board.D9)
+# For Feather M4 Express
+# audio = audiobusio.I2SOut(board.D1, board.D10, board.D11)
+# For Metro M4 Express
+# audio = audiobusio.I2SOut(board.D3, board.D9, board.D8)
+
+while True:
+    audio.play(wave)
+    while audio.playing:
+        pass

Adafruit_MAX98357/FeatherM0MAX98357.fzz

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+import board
+import audiobusio
+from microcontroller import Pin
+
+
+def is_hardware_i2s(bit_clock, word_select, data):
+    try:
+        p = audiobusio.I2SOut(bit_clock, word_select, data)
+        p.deinit()
+        return True
+    except ValueError:
+        return False
+
+
+def get_unique_pins():
+    exclude = ['NEOPIXEL', 'APA102_MOSI', 'APA102_SCK']
+    pins = [pin for pin in [
+        getattr(board, p) for p in dir(board) if p not in exclude]
+            if isinstance(pin, Pin)]
+    unique = []
+    for p in pins:
+        if p not in unique:
+            unique.append(p)
+    return unique
+
+
+for bit_clock_pin in get_unique_pins():
+    for word_select_pin in get_unique_pins():
+        for data_pin in get_unique_pins():
+            if bit_clock_pin is word_select_pin or bit_clock_pin is data_pin or word_select_pin\
+                    is data_pin:
+                continue
+            else:
+                if is_hardware_i2s(bit_clock_pin, word_select_pin, data_pin):
+                    print("Bit clock pin:", bit_clock_pin, "\t Word select pin:", word_select_pin,
+                          "\t Data pin:", data_pin)
+                else:
+                    pass