Pulse Width Modulation
How it works Link to Sparkfun tutorial Code... import RPi.GPIO as GPIO import time #BCM refers to how the pins are refered to. #See here for reference #https://raspberrypi.stackexchange.com/ #questions/12966/ #what-is-the-difference-between-board-and-bcm-for-gpio-pin-numbering GPIO.setmode(GPIO.BCM) led_pin = 18 GPIO.setup(led_pin, GPIO.OUT) #This is setting the pulse frequency to 500Hz #Actually this is kind of true but the accuracy falls off #as the frequency rises. pwm_led = GPIO.PWM(led_pin, 500) #This means that the led gets started at 100% of the cycle pwm_led.start(100) try: while (True): #change to raw_input if using python 2 duty_s = input("Enter Brightness (0 to 100 or x to exit):") if duty_s == 'x': break #The following checks the input is a number #and the number is between 0 - 100 #if the user inputs an x exit try: duty = int (duty_s) isNumber = True ...