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micropython/db_meter.py

+'''
+Example program for use in a workshop.
+Should work on a WS2812 strip with a lenght of 10 pixels.
+The length of the strip is entered in "number_pixels".
+Works with a MAX4466 microphone amplifier module.
+Version: 0.1 from 02.08.2024
+License: CC-BY	Weja/HoFaLab
+'''
+number_pixels	= 10
+brightness		= 0.4 	# value between 0 and 1
+Sensitivity		= 1.0		#	
+
+import WS2812onRP2040
+import time
+from machine import ADC, Pin, Timer
+import math
+import sys
+
+try:
+    micvcc = Pin(11, Pin.OUT)
+    micgnd = Pin(10, Pin.OUT)
+    micgnd.value(0)
+    micvcc.value(1)
+    mic = ADC(Pin(26))     # create ADC object on ADC pin
+
+    pixels = WS2812onRP2040.strip(number_pixels,29,0.3)
+
+    time.sleep(5) # wait 5 sec. before start
+
+    def vu_meter(): 
+        vu=0
+        for r in range(50):
+            vu+=abs(mic.read_u16() - 32767)
+        return (vu/100000) * Sensitivity
+
+    def peak():
+        peak = 0
+        for r in range(2000):
+            peak = max(peak, vu_meter())
+        return peak*peak
+
+    for t in range(200):
+        pixels.fill((0,0,0))
+        val = peak()
+        anz = min(val+0.5,10)
+        col = WS2812onRP2040.hue2col(120-(anz*12))
+        #print(val)
+        for p in range(anz):
+            pixels.pset(p,col)
+        pixels.show()
+    #time.sleep(0.1)
+except:
+    pixels.fill((0,0,0),1)
+    time.sleep(0.1)
+    sys.exit()
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