However, when I added a small time delay in the while loop, the output would either get stuck on a single value or take multiple seconds to reflect a change to the potentiometer. When I ran the following python script, it worked properly and the sensor values were printing out in my terminal. Val = analogRead(potPin) // read the value from the sensor In Python, sleep è una funzione che consente di mettere in pausa un programma per un momento e poi farlo proseguire senza variazioni. Int val = 0 // variable to store the value coming from the sensor The arduino is running the following code: int potPin = 3 // select the input pin for the potentiometer Can’t tell for sure without knowing which MQTT library you are using.I am attempting to control the position of my computer's cursor using a potentiometer hooked up to my arduino nano. But when you call await asyncio.sleep (5), it will ask the event loop to run something else while your. When time.sleep (5) is called, it will block the entire execution of the script and it will be put on hold, just frozen, doing nothing. import time time.sleep (seconds/1000000.0) time.sleep () takes seconds as a parameter. However, the main difference is that time.sleep (5) is blocking, and asyncio.sleep (5) is non-blocking.
#Python sleep code
If your MQTT client library is dependent on the current thread being able to continue running, then it may be that your first mqttc.publish call queues the message, but the code that actually sends it to the wire does not run for five seconds which may be more than an internal time out so that message gets tossed, undelivered. 8 Answers Sorted by: 56 Since usleep generally means you want to delay execution for x microseconds, you must divide the seconds value by 1000000. However, the way time.sleep works is that it slams the brakes on the current thread for the amount of time you requested. Chances are that time.sleep is in fact “working properly”, in the sense that it most likely is doing exactly what you asked it to do. The one thing that I see as problematic in your code is time.sleep. As a Python programmer, you might have come across. Without more details, it is hard to pinpoint an issue with any specificity. In this tutorial, we will explore the sleep() function in Python, its usage, and some related concepts. What is mqttc? Probably an MQTT client but where does it come from? How is it initialized? Which MQTT library you are using for it? Also it might help to know the values of MQTT_QOS and MQTT_RETAIN, as they make a difference in how messages are delivered.Īnd how do you observe what’s been published? Mqttc.publish(MQTT_TOPIC_DEFOUT, payload='Defrost inactive', qos=MQTT_QOS, retain=MQTT_RETAIN) #time.sleep set to 5 seconds for testing purpose Mqttc.publish(MQTT_TOPIC_DEFOUT, payload='Dripoff in progress', qos=MQTT_QOS, retain=MQTT_RETAIN) Mqttc.publish(MQTT_TOPIC_DEFOUT, payload='Defrosting in progress', qos=MQTT_QOS, retain=MQTT_RETAIN)Įlif message.topic = MQTT_TOPIC_DEFROST and message.payload = '0': This is my code: if message.topic = MONITOR_REFRESH:Įlif message.topic = MQTT_TOPIC_DEFROST and message.payload = '1': Im trying to get this to work using time.sleep, however the first message isn’t being sent, and after the set time in time.sleep it sends the second message.Ĭould someone tell me why this is happening? I don’t have very much experience writing Python.
The sleep () method suspends execution of the current thread for a given number of seconds. One of the most popular methods among them is sleep ().
The time. Python has a module named time which provides several useful methods to handle time-related tasks. Essentially, as the name implies, it pauses your Python program. I want to send a MQTT message on a input state change, and some time after the input state change send another message to the same topic as the first message. Pythons time module has a handy function called sleep (). I’m currently developing a cold storage monitoring system using a PiFace which communicates over MQTT.
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