rgb.py

code/test/rgb.py

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+import RPi.GPIO as GPIO
+import time
+
+GPIO.setmode(GPIO.BCM)
+
+RUNNING = True
+
+# PINs
+green = 20
+red = 21
+blue = 22
+
+# frequency for PWM
+freq = 100
+
+GPIO.setup(red, GPIO.OUT)
+GPIO.setup(green, GPIO.OUT)
+GPIO.setup(blue, GPIO.OUT)
+
+#defining the pins that are going to be used with PWM
+RED = GPIO.PWM(red, freq)
+GREEN = GPIO.PWM(green, freq)
+BLUE = GPIO.PWM(blue, freq)
+
+colors = [RED,GREEN,BLUE]
+
+try:
+	while RUNNING:
+		RED.start(100)
+		GREEN.start(1)
+		BLUE.start(1)
+		
+		for x in range(3):
+			full = colors[x]
+			up = colors[(x+1)%3]
+			zero = colors[(x+2)%3]
+
+			full.ChangeDutyCycle(100)
+			zero.ChangeDutyCycle(1)
+			
+			# Keep one color at 100%, let another raise from 1% to 100% and leave the third at 1%
+			for y in range(1,101):
+				up.ChangeDutyCycle(y)
+				time.sleep(0.01)
+
+			# Now keep the raised color at 100% and dim the original full color down to 1%
+			for y in range(1,101):
+				full.ChangeDutyCycle(100-y)
+				time.sleep(0.01)
+
+except KeyboardInterrupt:
+	RUNNING = False
+	GPIO.cleanup()