raspberry pi led does not blink

Question

I'm trying to make a led blink every second. This is my code:

import RPi.GPIO as gpio
try:
    while True:
        gpio.output(20, 1)
        time.sleep(1)
        gpio.output(20, 0)
except KeyboardInterrupt:
        gpio.cleanup()

The problem is that my LED just turns on and it does not blink.

TerryA · Accepted Answer · 2017-08-05 06:04:16Z

4

You don't sleep after you do gpio.output(20, 0). Thus, it instantly turns back on when it repeats the while loop. Do this:

while True:
    gpio.output(20, 1)
    time.sleep(1)
    gpio.output(20, 0)
    time.sleep(1)

answered Aug 5, 2017 at 6:04

TerryA

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