timer

问题 Briefly: I would like to turn on a relay for 30 seconds, after I toggle a switch on. I'm trying to do a blinds automation at home. I have a simple ON-OFF-ON switch, attached to an Arduino connected to Relays. I want to turn on Relay#1 for a maximum of 30 seconds if I toggle the switch down from center. In other words, relay turns on when I switch, and when timer reaches 30 seconds relay turns off. similarly I want to turn on Relay#2 for exactly 30 seconds if I toggle the switch up from center

问题 The following piece of code gives 0 as runtime of the function. Can anybody point out the error? struct timeval start,end; long seconds,useconds; gettimeofday(&start, NULL); int optimalpfs=optimal(n,ref,count); gettimeofday(&end, NULL); seconds = end.tv_sec - start.tv_sec; useconds = end.tv_usec - start.tv_usec; long opt_runtime = ((seconds) * 1000 + useconds/1000.0) + 0.5; cout<<"\nOptimal Runtime is "<<opt_runtime<<"\n"; I get both start and end time as the same.I get the following output

问题 At aodv When the node receive route request it will check if it has valid route to the destination, if it has no valid route it will rebroadcast the route request. I want to add timer before the node rebroadcast the route request.During the timer time if the node receive RREQ with the same ID (that means the node receive the RREQ twice ) then discard the RREQ otherwise rebroadcast the RREQ. I don’t know how to write the code of this part. The code of timer 1. The timer was defined in aodv.h

问题 I am working on the app that runs in background and need to call api for every 1 minute(60*1000 millisecond) without any fluctuations. I have tried Scheduler,timer and things but it is not working proper. For example, my scenario is to call the api on 09:11:36 am(first api call),09:12:36 am(second api call) and so on and at the end the final api call will be at 11:20:36 pm. I used below code : Handler minuteHandler = new Handler(); minuteHandler.postDelayed(runnable, 60000); final Runnable

问题 How would a JTable update automatically based off of time? So every time the current time changes, the table updates automatically. Could some provide a snippet of code of how this may work in Java? To have the Table update after the time changes. Please and thank you in advance. package times; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.text.DateFormat; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Date; import

问题 How would a JTable update automatically based off of time? So every time the current time changes, the table updates automatically. Could some provide a snippet of code of how this may work in Java? To have the Table update after the time changes. Please and thank you in advance. package times; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.text.DateFormat; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Date; import

问题 I'm working on a very basic program where I want a ball to follow a parabolic curve. My idea is to set a timer to tick with a certain interval and set the time as an variable which I use in my equation which will also be my x-value. I've created an event timer_Tick. How can I increase the value of X each time the timer ticks? 回答1: private int myVar= 0;//private field which will be incremented void timer_Tick(object sender, EventArgs e)//event on timer.Tick { myVar += 1;//1 or anything you

问题 I have been searching an answer for this question and I came across the functions timerfd_create and epoll in Linux. In a tutorial it was said that epoll_ctl() has an epoll_data_t union member of the epoll_event structure which can be used to execute a callback function on a timerfd event firing. But I am not sure on how to do it. Can anyone please help. 回答1: You can't put a callback function pointer into epoll_event because it can't fit in any of these slots: typedef union epoll_data { void

问题 Code: while ( int_Timer > 0 ) { int int_Ticks = 0; if ( int_Ticks < 100) { int_Ticks++; } if (int_Ticks == 100) { int_Timer--; lbl_Timer.Text = int_Timer.ToString(); } } So I basically tried to make a timer however, since I implemented this code the form doesn't appear in the taskbar. In fact the only indication is the Visual Studio Debug running. 回答1: Go into the Windows Forms toolbox. Under "Component", find "Timer". Drag/drop one onto your form. It won't show up where you dropped it (it's

问题 I have this code: import threading def printit(): print ("Hello, World!") threading.Timer(1.0, printit).start() threading.Timer(1.0, printit).start() I am trying to have "Hello, World!" printed every second, however when I run the code nothing happens, the process is just kept alive. I have read posts where exactly this code worked for people. I am very confused by how hard it is to set a proper interval in python, since I'm used to JavaScript. I feel like I'm missing something. Help is