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GPIO Driver and Library

GPIO Driver and Library

This Page about Raspberry Pi GPIO Script from Useful site. All library and driver has been installed on SANKI.

CPU usage on 6 LED by GPIO


This program is to show CPU usage % on 6 LED.

 

GPIO Dimming LED by PWM

This program is to change digital Pin in to PWM
  1. #!/usr/bin/python3
    
    import RPi.GPIO as GPIO # Remember to run as superuser (sudo)
    import time
    
    print("LED DIMMER USING PULSE WIDTH MODULATION")
    
    GPIO.setmode(GPIO.BCM)   # This example uses the BCM pin numbering
    GPIO.setup(25, GPIO.OUT) # GPIO 25 is set to be an output.
    
    pwm = GPIO.PWM(25, 10)   # pwm is an object. This gives a neat way to control the pin.
                             # 25 is the BCM pin number.
                             # 10 is the frequency in Hz.
    
    print("50%")             # Display 50 on the screen
    pwm.start(50)            # This 50 is the mark/space ratio or duty cycle of 50%
                             # Values from 0 to 100 are allowed including numbers like 33.33
    time.sleep(3)            # Three seconds till the next change
    
    pwm.ChangeFrequency(50)  # Frequency is now 50 Hz - LED stops flickering
    
    print("5%")
    pwm.ChangeDutyCycle(5)   # Duty cycle is now 5%
    time.sleep(0.5)          # 0.5 seconds till the next change
    
    print("10%")
    pwm.ChangeDutyCycle(10)  # Duty cycle is now 10%
    time.sleep(0.5)          # 0.5 seconds till the next change
    
    print("15%")
    pwm.ChangeDutyCycle(15)  # Duty cycle is now 15%
    time.sleep(0.5)          # 0.5 seconds till the next change
    
    print("20%")
    pwm.ChangeDutyCycle(20)  # Duty cycle is now 20%
    time.sleep(0.5)          # 0.5 seconds till the next change
    
    print("30%")
    pwm.ChangeDutyCycle(30)  # Duty cycle is now 30%
    time.sleep(0.5)          # 0.5 seconds till the next change
    
    print("50%")
    pwm.ChangeDutyCycle(50)  # Duty cycle is now 50%
    time.sleep(0.5)          # 0.5 seconds till the next change
    
    print("80%")
    pwm.ChangeDutyCycle(80)  # Duty cycle is now 80%
    time.sleep(0.5)          # 0.5 seconds till the next change
    
    print("100%")
    pwm.ChangeDutyCycle(100) # Duty cycle is now 100%
    time.sleep(0.5)          # 0.5 seconds till the next change
    
    print("50 at 5.5Hz for 3 seconds")
    pwm.ChangeFrequency(5.5) # Frequency is now 5.5 Hz
    pwm.ChangeDutyCycle(50)  # Duty cycle is now 50%
    time.sleep(3)            # Three seconds till the next change
    
    pwm.stop()               # Turn PWM off
    
    GPIO.cleanup()           # Always clean up at the end of programs.

Reference