initial

main.py

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+import machine
+import utime
+
+import array, time
+from machine import Pin
+import rp2
+
+# Configure the number of WS2812 LEDs.
+NUM_LEDS = 3
+PIN_NUM = 22
+brightness = 0.1
+
+
+@rp2.asm_pio(sideset_init=rp2.PIO.OUT_LOW, out_shiftdir=rp2.PIO.SHIFT_LEFT, autopull=True, pull_thresh=24)
+def ws2812():
+    T1 = 2
+    T2 = 5
+    T3 = 3
+    wrap_target()
+    label("bitloop")
+    out(x, 1)               .side(0)    [T3 - 1]
+    jmp(not_x, "do_zero")   .side(1)    [T1 - 1]
+    jmp("bitloop")          .side(1)    [T2 - 1]
+    label("do_zero")
+    nop()                   .side(0)    [T2 - 1]
+    wrap()
+
+
+# Create the StateMachine with the ws2812 program, outputting on pin
+sm = rp2.StateMachine(0, ws2812, freq=8_000_000, sideset_base=Pin(PIN_NUM))
+
+# Start the StateMachine, it will wait for data on its FIFO.
+sm.active(1)
+
+
+# Display a pattern on the LEDs via an array of LED RGB values.
+ar = array.array("I", [0 for _ in range(NUM_LEDS)])
+
+##########################################################################
+def pixels_show():
+    dimmer_ar = array.array("I", [0 for _ in range(NUM_LEDS)])
+    for i,c in enumerate(ar):
+        r = int(((c >> 8) & 0xFF) * brightness)
+        g = int(((c >> 16) & 0xFF) * brightness)
+        b = int((c & 0xFF) * brightness)
+        dimmer_ar[i] = (g<<16) + (r<<8) + b
+    sm.put(dimmer_ar, 8)
+    time.sleep_ms(10)
+
+def pixels_set(i, color):
+    ar[i] = (color[1]<<16) + (color[0]<<8) + color[2]
+
+def pixels_fill(color):
+    for i in range(len(ar)):
+        pixels_set(i, color)
+
+def color_chase(color, wait):
+    for i in range(NUM_LEDS):
+        pixels_set(i, color)
+        time.sleep(wait)
+        pixels_show()
+    time.sleep(0.2)
+
+def wheel(pos):
+    # Input a value 0 to 255 to get a color value.
+    # The colours are a transition r - g - b - back to r.
+    if pos < 0 or pos > 255:
+        return (0, 0, 0)
+    if pos < 85:
+        return (255 - pos * 3, pos * 3, 0)
+    if pos < 170:
+        pos -= 85
+        return (0, 255 - pos * 3, pos * 3)
+    pos -= 170
+    return (pos * 3, 0, 255 - pos * 3)
+
+def sensor2color(sens,color, wait,mini=12000,maxi=64000):
+    BLACK = (0, 0, 0)
+    RED = (255, 0, 0)
+    LEDS_on=NUM_LEDS*((sens-mini)/maxi)
+    print("LEDS: ",LEDS_on)
+    for i in range(NUM_LEDS):
+        if LEDS_on<i:
+            pixels_set(i, BLACK)
+        else:
+            pixels_set(i, RED)
+        time.sleep(.001)
+        pixels_show()
+    time.sleep(0.002)
+
+potentiometer = machine.ADC(26)
+
+BLACK = (0, 0, 0)
+RED = (255, 0, 0)
+
+while True:
+    sens=potentiometer.read_u16()
+    print(sens)
+    utime.sleep(1)
+    sensor2color(sens,RED, 0.8)