86 lines
1.8 KiB
Python
86 lines
1.8 KiB
Python
'''
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Audio Sensor Example
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'''
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from picographics import PicoGraphics, DISPLAY_ENVIRO_PLUS
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from pimoroni import RGBLED
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from machine import Pin, ADC
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import time
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print("""mic.py - displays a waveform on the attached screen
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""")
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display = PicoGraphics(display=DISPLAY_ENVIRO_PLUS)
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display.set_backlight(1.0)
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# Setup RGB Led
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led = RGBLED(6, 7, 10, invert=True)
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led.set_rgb(0, 0, 0)
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# Setup background
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BG = display.create_pen(0, 0, 0)
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TEXT = display.create_pen(255, 255, 255)
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MIC = display.create_pen(255, 0, 0)
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display.set_pen(BG)
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display.clear()
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# Setup analogue Channel for Mic
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MIC_PIN = 26
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mic = ADC(Pin(26))
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# array for storing
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results = []
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# Settings for bandwith and side
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BANDWIDTH = 2000
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SAMPLE_N = 240
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# Drawing routines
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def draw_background():
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display.set_pen(BG)
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display.clear()
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display.set_pen(TEXT)
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display.text("Sound Sensor", 5, 10, scale=3)
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def draw_txt_overlay(sensor_data):
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display.set_pen(MIC)
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display.text("Peak: {0}".format(sensor_data), 5, 60, scale=3)
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def draw_wave(results_array):
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result_index = 0
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for result in results_array:
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display.set_pen(MIC)
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display.pixel(result_index, int(120 + result))
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result_index += 1
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def read_mic():
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return mic.read_u16()
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def take_sample(frequency, length=240):
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buffer = []
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for index in range(length):
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buffer.append(read_mic())
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time.sleep(1 / frequency)
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return buffer
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while True:
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results = take_sample(BANDWIDTH, SAMPLE_N)
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# Rescale for display
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for result_index in range(len(results)):
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results[result_index] = (results[result_index] - 33100) / 30
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# Display Upates
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draw_background()
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draw_wave(results)
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draw_txt_overlay(max(results))
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display.update()
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time.sleep(0.2)
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