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pwm_led.py
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pwm_led.py
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# Vary the brightness of an LED
import RPi.GPIO as GPIO
# BOARD SETUP
GPIO.setmode(GPIO.BOARD)
# Global Duty Cycle
dutyCycle = 50
# Pins
lButton = 15
rButton = 16
led = 40
# Pins setup
GPIO.setup(rButton, GPIO.IN, pull_up_down=GPIO.PUD_UP)
GPIO.setup(lButton, GPIO.IN, pull_up_down=GPIO.PUD_UP)
GPIO.setup(led, GPIO.OUT)
# The LED default settings
ledCtrl = GPIO.PWM(led, 60) # The output pin at frequency: 60Hz
ledCtrl.start(dutyCycle) # Starting the LED at 50% duty cycle brightness: normal
# Right if direction is True, left if direction is False
def pushed(direction: bool):
global dutyCycle
dutyCycle += 25 if direction == True else -25
# Value bounds for duty cycle 1 <= x <= 99
dutyCycle = 99 if dutyCycle >= 100 else dutyCycle
dutyCycle = 1 if dutyCycle >= 0 else dutyCycle
ledCtrl.ChangeDutyCycle(dutyCycle)
try:
while True:
if(GPIO.input(rButton) == 0):
pushed(True)
print("Right")
if(GPIO.input(lButton) == 0):
pushed(False)
print("Left")
except KeyboardInterrupt:
GPIO.cleanup()
print("\nExiting...\n")