CODEWITHSUNDEEP
pythonif-statement
Andre Brown
Andre Brown

Reputation: 31

python if wait then statement

I am working on a raspberry pi python script and I am struggling to get the if statement to do what I want.

I can count fingers on a hand in a video stream and this is working fine.

Next I want to initiate a first event (beep) when 5 fingers (defects) are counted, and then proceed into a sub loop where if the 5 fingers subsequently change to zero fingers within a given time (2s) then another second event (click) happens.

This is what I have so far (not quite working):

if count_defects==5:
    os.system('mpg321 beep.mp3 -q')
    time.sleep(2)
    if count_defects<5:
        os.system('mpg321 click.mp3 -q')
else:
    cv2.putText(img, "Waiting", (50,50), font, 1, (255,255,255), 1)

Hope someone can help thanks

Upvotes: 3

Views: 588

Answers (1)

roganjosh
roganjosh

Reputation: 13175

The issue is that count_defects takes an initial value == 5 to pass the if clause. However, it can never then assume another value unless you give it an opportunity to recalculate. I don't know the function you use to get this value, but your code should look something like the following.

def check_number_of_fingers():
    return number_of_fingers


count_defects = check_number_of_fingers()

if count_defects == 5:
    os.system('mpg321 beep.mp3 -q')
    time.sleep(2)
    count_defects = check_number_of_fingers() # Recalculate the value after elapsed time
    if count_defects < 5:
        os.system('mpg321 click.mp3 -q')
else:
    cv2.putText(img, "Waiting", (50,50), font, 1, (255,255,255), 1)

Upvotes: 3

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