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+--- Thread: time.sleep (/thread-26448.html)
time.sleep - mtnwinds - May-02-2020
Brand new to Python. If I want to pause the execution of my program for an hour, is sleep() the appropriate function to call? Do I have to express the value passed to sleep()in secs or can I use mins? I'm using a RPi 3B+ with a relay HAT. Thanks for helping.
import RPi.GPIO as GPIO
import time
GPIO.setmode(GPIO.BOARD)
GPIO.setup(32,GPIO.OUT) #Pin 32 = Relay #1 (Pump) 20 Min 1200 Sec
GPIO.output(32,GPIO.HIGH) #HIGH = OFF
GPIO.setup(36,GPIO.OUT) #Pin 36 = Relay #2(Solenoid A) 45 Min, 2700 Sec
GPIO.output(36,GPIO.HIGH)
GPIO.setup(38,GPIO.OUT) #Pin 38 = Relay #3(Solenoid B) 45 Min
GPIO.output(38,GPIO.HIGH)
GPIO.setup(40,GPIO.OUT) #Pin 40 = Relay #4(unused)
GPIO.output(40,GPIO.HIGH)
while True:
try:
GPIO.output(36,GPIO.LOW) #Open Sol A
GPIO.output(32,GPIO.LOW) #Pump ON
time.sleep(1200) #Flood bed A for 20 min
GPIO.output(38,GPIO.LOW) #Open Sol B
GPIO.output(36,GPIO.HIGH) #Close Sol A
time.sleep(1200) #Flood bed B for 20 min
GPIO.output(32,GPIO.HIGH) #Pump OFF
GPIO.output(38,GPIO.HIGH) #Close Sol B
time.sleep(1800) #Allow for complete drainage of beds
except KeyboardInterrupt:
RE: time.sleep - Larz60+ - May-02-2020
sleep will pause for an hour, day or whatever if given the proper value.
It does not allow other processes take place (in same script) however.
A better way is to use an event which will create an event on timeout.
I have an example of this type of timer on this forum here: https://python-forum.io/Thread-Multi-threaded-Timer-Class?highlight=timer
RE: time.sleep - mtnwinds - May-02-2020
Thank you for your kind reply. I will study your example.
RE: time.sleep - mtnwinds - May-21-2020
Multi-threaded-Timer-Class
In your example you define 4 functions, each running in their own thread. Can I use a call to 'sleep' in 1 thread without halting the execution of the other threads?
RE: time.sleep - Larz60+ - May-21-2020
Quote:Can I use a call to 'sleep' in 1 thread without halting the execution of the other threads?yes