Raspberry Pi LEDs | CCC

This page contains code to control the Paspberry Pi 5 LEDs
Code to select and Blink One LED


            

            import gpiod
            

            from time import sleep
            

            

            #Assign the varable 'chip' to the Raspberry Pi 5's board chip.
            

            chip = gpiod.Chip('gpiochip4')
            

            

            #Each LED needs to have these three lines of code.
            

            #1) A varaible specifying which Pin will be used.
            

            PIN_18 = 18
            

            #2) A variable specifying which PIN will be used for the LED. I named the variable the color of the LED.
            

            red = chip.get_line(PIN_18)
            

            #3) Define how the PIN will be used: It will be an LED and the type will send current out when active using "red.set_value([0,1])" 0=off and 1=on.
            

            red.request(consumer='LED',type=gpiod.LINE_REQ_DIR_OUT)
            

            

            #This function will turn off all LEDs using [varable].set_value(0)
            

            def all_off():
            

                #Suspend the program to make sure the LED has time to light up.
            

                sleep(.1)
            

                #Turn off the LEDs. Each LED needs to be set to 0 "off".
            

                red.set_value(0)
            

            

            
            print("Press Ctrl + c to stop.")
            

            pattern = input(f"Select a pattern: \n 1=Red Blink \n\n")
            

            

            
            try:
            

                while True:
            

                    #Red Blink
            

                    if pattern == '1':
            

                        print('Red Blink')
            

                        red.set_value(1)
            

                        sleep(1)
            

                        all_off()
            

                        sleep(1)
            


            except KeyboardInterrupt:
             

                 #Turn off any LEDs that may be lit.
             

                 all_off()
             

                 #Let the Raspberry Pi know the PINs are no longer being used. Each pin needs to be listed.
             

                 red.release()
             

                 #Free up the memory being used by the 'chip' variable.
             

                 chip.close()