sunfounder_1_dual_color.py

import RPi.GPIO as GPIO
import time

colors = [0xFF00, 0x00FF, 0x0FF0, 0xF00F]
pins = {'pin_R':11, 'pin_G':12} # pins is a dict

GPIO.setmode(GPIO.BOARD) # Numbers GPIOs by physical location
for i in pins:
  GPIO.setup(pins[i], GPIO.OUT) # Set pins' mode is output
  GPIO.output(pins[i], GPIO.HIGH) # Set pins to high(+3.3V) to off led

p_R = GPIO.PWM(pins['pin_R'], 2000) # set Frequece to 2KHz
p_G = GPIO.PWM(pins['pin_G'], 2000)

p_R.start(0) # Initial duty Cycle = 0(leds off)
p_G.start(0)

def map(x, in_min, in_max, out_min, out_max):
  return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min

def setColor(col): # For example : col = 0x112233
  R_val = (col & 0x1100) >> 8
  G_val = (col & 0x0011) >> 0
  
  R_val = map(R_val, 0, 255, 0, 100)
  G_val = map(G_val, 0, 255, 0, 100)
  
  p_R.ChangeDutyCycle(R_val) # Change duty cycle
  p_G.ChangeDutyCycle(G_val)

def loop():
  while True:
    for col in colors:
      setColor(col)
      time.sleep(0.5)

def destroy():
  p_R.stop()
  p_G.stop()
  for i in pins:
    GPIO.output(pins[i], GPIO.HIGH) # Turn off all leds
  GPIO.cleanup()

if __name__ == "__main__":
  try:
    loop()
  except KeyboardInterrupt:
    destroy()