Examples: adding button_control.py

micropython/examples/plasma_2350/button_control.py

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+'''
+An example that uses the buttons to control the colour and brightness of the attached LED strip.
+
+Button A - Change the hue
+BOOT/User button - Cycle through brightness. 10 levels of brightness available.
+
+'''
+import time
+
+import machine
+import plasma
+from plasma import plasma2040
+
+# Set how many LEDs you have
+NUM_LEDS = 66
+
+# Setup for the button pins
+user_button = machine.Pin(22, machine.Pin.IN)
+a_button = machine.Pin(12, machine.Pin.IN, machine.Pin.PULL_UP)
+
+# WS2812 / NeoPixel™ LEDs
+led_strip = plasma.WS2812(NUM_LEDS, 0, 0, plasma2040.DAT, color_order=plasma.COLOR_ORDER_BGR)
+
+# Start updating the LED strip
+led_strip.start()
+
+hue = 0.0
+brightness = 1.0
+
+while True:
+
+    if a_button.value() == 0:
+        hue += float(10) / 2000.0
+        time.sleep(0.02)
+
+    if user_button.value() == 0:
+        if brightness >= 0.0 and brightness < 1.0:
+            brightness += 0.1
+        else:
+            brightness = 0.0
+
+        # Wait until the user releases the button
+        while user_button.value() == 0:
+            pass
+
+    # Set each LED in the strip to the colour we want
+    for i in range(NUM_LEDS):
+        led_strip.set_hsv(i, hue, 1.0, brightness)