Add mic to beeper script

mic.py

@@ -0,0 +1,40 @@
+import numpy as np
+import pyaudio
+from requests import get
+
+audio = pyaudio.PyAudio()
+stream = audio.open(
+    format = pyaudio.paInt16,
+    channels = 1,
+    rate=44100,
+    input=True
+)
+
+# https://stackoverflow.com/questions/45908268/how-to-know-the-frequency-of-audio-from-microphone
+# https://stackoverflow.com/questions/3694918/how-to-extract-frequency-associated-with-fft-values-in-pytho
+curfreq = 0
+stop = False
+
+while True:
+    chunk = stream.read(2048)
+    w = np.fft.fft(list(chunk))[10:100]
+    f = np.fft.fftfreq(4196)
+    i = 10+np.argmax(np.abs(w))
+    mag = abs(w[i-10])
+    freq = abs(2 * f[i] * 44100)
+
+    if mag > 50000 and curfreq == 0:
+        # Detected mic input
+        # Start new freq
+        stop = False
+        curfreq = freq
+        print('Starting', curfreq)
+        get('http://10.242.6.228:5000/startfreq/' + str(curfreq))
+    elif mag <= 50000 or abs(curfreq-freq) > 20:
+        if stop and curfreq != 0:
+            print('Stopping', curfreq)
+            get('http://10.242.6.228:5000/stopfreq/' + str(curfreq))
+            curfreq = 0
+        else:
+            # Stop next round
+            stop = True