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micropython/main.py

+'''
+Example program for use in the soldering workshop.
+Should work on a WS2812 strip of any length.
+The variable "softgain" controls the sensitivity in selfcalibrating mode and
+the length of the strip is entered in "number_pixels".
+Works with a MAX4466 microphone amplifier module.
+Version: 0.2 from 26.05.2024
+License: CC-BY	Weja/HoFaLab
+'''
+number_pixels = 10
+brightness    = 0.4 # value between 0 and 1
+
+import WS2812onRP2040
+import time
+from machine import ADC, Pin, Timer
+
+softgain,mode,average = 0,0,0 #init values
+mic = ADC(Pin(28))     # create ADC object on ADC pin
+pixels = WS2812onRP2040.strip(number_pixels,29,brightness)
+timer1 = Timer(period=10000, mode=Timer.PERIODIC, callback=lambda t:changemode())
+
+def changemode(): #0-left,1-right,2-center lights
+    global mode
+    mode = (mode+1)%3
+
+def vu_meter(): 
+    vu=0
+    for r in range(500):
+        vu+=abs(mic.read_u16() - 32767)
+    return (vu/500)/32767
+
+time.sleep(5) # wait 5 sec. before start
+
+while True:
+    sound = vu_meter()
+    average = average/50*49 + sound/50
+    softgain = 4/average # selfcalibrating
+    if sound < 0.03: #mute - depending on the microphone and ambient noise
+        softgain=1
+    hue = min(int(sound*softgain*50),359)
+    #print(sound,softgain,hue) #debug info
+    col = WS2812onRP2040.hue2col(hue)
+    anz = min(int(sound*softgain),number_pixels)
+    pixels.fill((0,0,0))
+    for p in range(anz):
+        if mode == 0: #left to right
+            pixels.pset(number_pixels-1-p,(col))
+        if mode == 1: #right to left
+            pixels.pset(p,(col))
+        if mode == 2: # left/right to center
+            pixels.pset(p,(col))
+            pixels.pset(number_pixels-1-p,(col))
+    pixels.show()
+    time.sleep(0.125) # refresh time for the lights. 
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