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Python 3 code Question

ellip

Hi.  I am new to the Raspberry Pi.  I have a Raspberry Pi 3 and a PiFace 2.  I am trying to update a Christmas decoration made over 40 years ago by my father. It was run by a rotisserie motor and a wooden cylinder with copper strips and screws to make contact and light the stars up in sequences.

 

I have 5 stars in the following formation:

 

     1          2

 

          5

 

     4          3

 

I am trying to have the stars light up in a certain sequence with a small delay in between each function

 

1

2

3

4

5

1,2,3

2,3,4

3,4,1

4,1,2

1,2,5

2,3,5

3,4,5

4,5,1

1,2,3,4,5

then begin the sequence again.

I have tried following as many of the posts as I can and receive errors on everything from syntax to int and tuples.

I am sure that it is something that is simple to the rest of you but just eludes me.  Any help in any way will be greatly appreciated.

Elli

  • 0 in reply to clem57

    Is there a way to "dumb" this down....I am a new "newbie" and haven't a lot of experience with Python....sorry if this is too ridiculous.

  • 0

    Hi Ellen,

     

    Suggestion: With any problem I think it's helpful try and break things into pieces. Share more info with us on what you've tried, what isn't working, what code you are using.

    I.E. Have you tested a basic python script to get PiFace to turn on a single light yet? Confirm that this is working before you proceed. Test it on a random light like an LED. Then test it on your ornament.

     

    Hardware - PiFace

    I've never worked with PiFace so I don't know what your hookup options are to your ornament. I assume you have already made your electrical connections? Completed to the point where you can turn on a light if you run some basic blink script? There seems to

     

     

    Code - The Loop

    What code have you tried so far? Share it and we can help you more easily.

    Here is an example code that will look through your lighting combinations. This will go through each lighting combination and wait 1 second in between. Try running it and see how it works. You can modify the wait time as well.

     

    Hope this helps!

     

    J

     

    import time
# Example of a script to cycle through and change light sequence


# Every lighting combination can be summarized as a '1' for an on light and an '0' for an off light.
# Those combinations are shown below.
lights = ['10000','01000','00100','00010','00001','11100','01110','10110','11010','11001','01101','00111','10011','11111']


# Define wait time for our function
waittime = 1 # Number of seconds between light sequences, measured in seconds.


# We want this script to run perpetually so we create a while True loop
while True:
  # We iterate through each item in our list of light combinations, which is called 'lights'
  for index,item in enumerate(lights):
  # Putting a bunch of text print outs so you can see how the loop iterates
  print('We are now printing combination number',index+1,'in our light sequence')
  print('Light combination is',item)

  # Here is where you would send the data to the PiFace to control its lighting.
  print('If we send these commands to a lighting system \nlight 1 is',item[0],'light 2 is',item[1],'light 3 is',item[2],'light 4 is',item[3],'light 5 is',item[4],'\n')
  # Insert some lighting command here. Use the on/off data stored in the item variable to turn your lights on or off.




  # Now we use time command to put a delay in between lighting instruction
  time.sleep(waittime)
  print('Completed all sequences. repeating')

  • 0

    Ok...thank you for your reply

     

    i have the 5 stars (1-5) wired to the pi/piface.  They light up in sequence 5,4,3,2,1 then shut off in the same sequence 5,4,3,2,1,.

    This is the code i used

     

    from time import sleep

    import pifacedigitalio

     

    DELAY = 0.5  # seconds

     

    if __name__  ==  "__main__":

         pifacedigital = pifacedigitalio.PiFaceDigital()

         while True:

              pifacedigital.leds[5].toggle

              sleep(DELAY)

              pifacedigital.leds[4].toggle()

              sleep(DELAY)

              pifacedigital.leds[3].toggle()

              sleep(DELAY)

              pifacedigital.leds[2].toggle()

              sleep(DELAY)

              pifacedigital.leds[1].toggle

              sleep(DELAY)

     

    the lights will sequence until i stop them. 

  • 0 in reply to ellip

    This code appears to give the specified results:

     

    #!/usr/bin/env python3

    import pifacedigitalio, time

     

    pfd = pifacedigitalio.PiFaceDigital()

     

    while True:

         pfd.output_port.value = 0x02

         time.sleep(0.5)

         pfd.output_port.value = 0x04

         time.sleep(0.5)

         pfd.output_port.value = 0x08

         time.sleep(0.5)

         pfd.output_port.value = 0x10

         time.sleep(0.5)

         pfd.output_port.value = 0x20

         time.sleep(0.5)

         pfd.output_port.value = 0x0E

         time.sleep(0.5)

         pfd.output_port.value = 0x1C

         time.sleep(0.5)

         pfd.output_port.value = 0x1A

         time.sleep(0.5)

         pfd.output_port.value = 0x16

         time.sleep(0.5)

         pfd.output_port.value = 0x26

         time.sleep(0.5)

         pfd.output_port.value = 0x2C

         time.sleep(0.5)

         pfd.output_port.value = 0x38

         time.sleep(0.5)

         pfd.output_port.value = 0x32

         time.sleep(0.5)

         pfd.output_port.value = 0x3E

         time.sleep(0.5)

  • 0 in reply to ellip

    It sounds like you have everything working, just a bit of code modification to get the right sequence.

    The main thing in your sequence is to toggle the devices you want on and then after a delay toggle the same devices off before toggling the next set on:

     

         while True:

              pifacedigital.leds[1].toggle

              sleep(DELAY)

              pifacedigital.leds[1].toggle

              pifacedigital.leds[2].toggle()

              sleep(DELAY)

              pifacedigital.leds[2].toggle()

              pifacedigital.leds[3].toggle()

                sleep(DELAY)

              pifacedigital.leds[3].toggle()

              pifacedigital.leds[4].toggle()

                sleep(DELAY)

              pifacedigital.leds[4].toggle()

              pifacedigital.leds[5].toggle()

                sleep(DELAY)

              pifacedigital.leds[5].toggle()

              pifacedigital.leds[1].toggle

              pifacedigital.leds[2].toggle()

              pifacedigital.leds[3].toggle()

                sleep(DELAY)

              pifacedigital.leds[1].toggle

              pifacedigital.leds[2].toggle()

              pifacedigital.leds[3].toggle()

              pifacedigital.leds[2].toggle

              pifacedigital.leds[3].toggle()

              pifacedigital.leds[4].toggle()

                sleep(DELAY)

              pifacedigital.leds[2].toggle

              pifacedigital.leds[3].toggle()

              pifacedigital.leds[4].toggle()

              pifacedigital.leds[3].toggle

              pifacedigital.leds[4].toggle()

              pifacedigital.leds[1].toggle()

                sleep(DELAY)

              pifacedigital.leds[3].toggle

              pifacedigital.leds[4].toggle()

              pifacedigital.leds[1].toggle()

              pifacedigital.leds[4].toggle()

              pifacedigital.leds[1].toggle()

              pifacedigital.leds[2].toggle()

              sleep(DELAY)

              pifacedigital.leds[4].toggle()

              pifacedigital.leds[1].toggle()

              pifacedigital.leds[2].toggle()

              pifacedigital.leds[1].toggle()

              pifacedigital.leds[2].toggle()

              pifacedigital.leds[5].toggle()

              sleep(DELAY)

              pifacedigital.leds[1].toggle()

              pifacedigital.leds[2].toggle()

              pifacedigital.leds[5].toggle()

              pifacedigital.leds[2].toggle()

              pifacedigital.leds[3].toggle()

              pifacedigital.leds[5].toggle()

              sleep(DELAY)

              pifacedigital.leds[2].toggle()

              pifacedigital.leds[3].toggle()

              pifacedigital.leds[5].toggle()

              pifacedigital.leds[3].toggle()

              pifacedigital.leds[4].toggle()

              pifacedigital.leds[5].toggle()

              sleep(DELAY)

              pifacedigital.leds[2].toggle()

              pifacedigital.leds[3].toggle()

              pifacedigital.leds[5].toggle()

              pifacedigital.leds[4].toggle()

              pifacedigital.leds[5].toggle()

              pifacedigital.leds[1].toggle()

              sleep(DELAY)

              pifacedigital.leds[4].toggle()

              pifacedigital.leds[5].toggle()

              pifacedigital.leds[1].toggle()

              pifacedigital.leds[1].toggle()

              pifacedigital.leds[2].toggle()

              pifacedigital.leds[3].toggle()

              pifacedigital.leds[4].toggle()

              pifacedigital.leds[5].toggle()

              sleep(DELAY)

              pifacedigital.leds[1].toggle()

              pifacedigital.leds[2].toggle()

              pifacedigital.leds[3].toggle()

              pifacedigital.leds[4].toggle()

              pifacedigital.leds[5].toggle()

  • 0

    To Douglas Wong:

     

    Strange, the code resulted in the exact sequence specified. If you had bothered to test the code that i published you would have seen that it did actually produce the specified sequence - and with much less code than the gobeltygoop you posted to "correct" me!

  • 0 in reply to urkraft

    To Douglas Wong:

    Sorry, i see now that your post was not directed to me. Was not very focused when i read it. I did notice that there was a very important bug in my code in that it did not handle interrupts and could easily enter an undesirable state when stopped. A better solution to my submission follows:

     

    #!/usr/bin/env python3

    import pifacedigitalio, time, sys

     

    pfd = pifacedigitalio.PiFaceDigital()

     

    try:

         while True:

              pfd.output_port.value = 0x02

              time.sleep(0.5)

              pfd.output_port.value = 0x04

              time.sleep(0.5)

              pfd.output_port.value = 0x08

              time.sleep(0.5)

              pfd.output_port.value = 0x10

              time.sleep(0.5)

              pfd.output_port.value = 0x20

              time.sleep(0.5)

              pfd.output_port.value = 0x0E

              time.sleep(0.5)

              pfd.output_port.value = 0x1C

              time.sleep(0.5)

              pfd.output_port.value = 0x1A

              time.sleep(0.5)

              pfd.output_port.value = 0x16

              time.sleep(0.5)

              pfd.output_port.value = 0x26

              time.sleep(0.5)

              pfd.output_port.value = 0x2C

              time.sleep(0.5)

              pfd.output_port.value = 0x38

              time.sleep(0.5)

              pfd.output_port.value = 0x32

              time.sleep(0.5)

              pfd.output_port.value = 0x3E

              time.sleep(0.5)

    except:

         pfd.output_port.all_off()

         pfd.deinit_board()

         print('\nExiting due to unexpected interrupt.')

         sys.exit(0)

     

  • 0 in reply to urkraft

    Since there is a lot of unnecessary repetition and generally bad programming practices in my previous posts on this topic, i have cleaned up my code a bit. This is my alternative solution:

     

    #!/usr/bin/env python3

    import pifacedigitalio, time, sys

     

    pause_time = 0.5

    the_sequence = [0x02, 0x04, 0x08, 0x10, 0x20, 0x0E, 0x1C, 0x1A, 0x16, 0x26, 0x2C, 0x38, 0x32, 0x3E]

     

    pfd = pifacedigitalio.PiFaceDigital()

     

    try:

         while True:

              for seq in the_sequence:

                   pfd.output_port.value = seq

                   time.sleep(pause_time)

    except:

         pfd.output_port.all_off()

         pfd.deinit_board()

         print('\nExiting due to unexpected interrupt.')

         sys.exit(0)

     

  • 0 in reply to urkraft

    sorry - I didn't see your code before posting. My code was not trying to be efficient, just an easy extrapolation of the working code.