first commit Screaming Painting code

Screaming_Painting/screaming_painting.py

@@ -0,0 +1,69 @@
+import time
+import math
+import array
+import audiobusio
+import audioio
+import board
+from adafruit_crickit import crickit
+
+# Number of samples to read at once.
+NUM_SAMPLES = 160
+
+# Remove DC bias before computing RMS.
+def normalized_rms(values):
+    minbuf = int(mean(values))
+    samples_sum = sum(
+        float(sample - minbuf) * (sample - minbuf)
+        for sample in values
+    )
+
+    return math.sqrt(samples_sum / len(values))
+
+def mean(values):
+    return sum(values) / len(values)
+
+mic = audiobusio.PDMIn(board.MICROPHONE_CLOCK, board.MICROPHONE_DATA,
+                       sample_rate=16000, bit_depth=16)
+
+# Record an initial sample to calibrate. Assume it's quiet when we start.
+samples = array.array('H', [0] * NUM_SAMPLES)
+mic.record(samples, len(samples))
+
+head_servo = crickit.servo_1
+head_servo.set_pulse_width_range(min_pulse=500, max_pulse=2500)
+head_servo.angle = 90  # center the head.
+
+# Set audio out on speaker.
+a = audioio.AudioOut(board.A0)
+
+# Start playing the file (in the background).
+def play_file(wavfile):
+    print("Playing scream!")
+    with open(wavfile, "rb") as f:
+        wav = audioio.WaveFile(f)
+        a.play(wav)
+        while a.playing:
+            head_servo.angle = 60
+            time.sleep(.01)
+            head_servo.angle = 120
+            time.sleep(.01)
+
+
+while True:
+    mic.record(samples, len(samples))
+    magnitude = normalized_rms(samples)
+    print(((magnitude),))  # formatting is for the Mu plotter.
+
+    if magnitude < 1000:  # it's quiet, do nothing.
+        pass
+    else:
+        print("LOUD")
+        head_servo.angle = 60
+        time.sleep(.05)
+        head_servo.angle = 120
+        time.sleep(.05)
+        head_servo.angle = 90
+        time.sleep(.02)
+        play_file("scream_low.wav")
+        head_servo.angle = 90
+        time.sleep(2)