Countdown Timer 5min

[Beatrix Gerke]

Imbuilding a 5 minute countdown timer for starting sailing races. I have been able to get the timer working perfectly however i would like to have a warning buzzer buzz once a second for the last 10 seconds of minute 4,1 and 0.

currentMillis and previousMillis are crappy names. Some event happened that you want to record when for. The name of the variable should reflect the event, NOT the fact that millis() was used to get the value to record.

However then the buzzer is sounding out is currently staying on for 1 whole second then remaining off for one second.

I need it to sound for 200ms then remain off for the remaining 800ms. Changing the following part of code doesn't change the duration of the buzz?

If that time exceeds the on threshold, and the buzzer is on, turn it off, and record the current event's time. If that time exceeds the off threshold, and the buzzer is off, turn it one and record the current event's time.

Use a second millis() timer to run the "decrement the second and display the new time" once every second. Run the "do the beeping if it's beep time" every time through loop() so the beep timer can do its work.

johnwasser:

Use a second millis() timer to run the "decrement the second and display the new time" once every second. Run the "do the beeping if it's beep time" every time through loop() so the beep timer can do its work.

You need to keep track of whole seconds for the timer, and you need to keep track of 0.8 second for the buzzer. This suggests to me the idea of keeping track of time to the nearest tenth of a second rather than to the nearest second.

William-Findlay:

Im building a 5 minute countdown timer for starting sailing races. I have been able to get the timer working perfectly however i would like to have a warning buzzer buzz once a second for the last 10 seconds of minute 4,1 and 0.

Do you want the warning buzzer to start buzzing its final buzz at 4 minutes and 59 seconds after the timer starts? Or at 4 minutes and 59.2 seconds after the timer starts (so as to end exactly 5 minutes after the timer starts)? Or should this final buzz start exactly 5 minutes after the timer starts (so that it is not a warning buzz but rather a "time's up!" buzz)?

Curious to know how you got on with this project, I to am wanting to do the same in timing race starts with visual digits across 2 seven segment displays. Also need to do countdowns of up to 60 minutes.

5 minute timer to set alarm for 5 minute minute from now.Online countdown timer alarms you in five minute. To run stopwatch press "Start Timer" button. You can pause and resume the timer anytime you want by clicking the timer controls. When the timer is up, the timer will start to blink.

This timer switch comes with 6 preset time buttons and 1 manual ON button with 6 selectable times: 5 min, 10 min, 30 min, 60 min, 2 hours, and 4 hours. Includes a button on the bottom for manual control of connected devices, allowing you to reset or stop the preset time. All loads connected to the timer will automatically turn off when the preset time expires. Not only is the switch user-friendly for all ages, but it can also be easily replaced with a standard single-pole light or ventilation fan switch.

Replaces any standard wall switch, fits any standard decorator wall plate. This countdown timer switch is an ideal energy-saving solution for the bedroom, exhaust fans, sprinkler systems, garages, and laundry room applications.

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Adobe After Effects is a powerful video editing & effects application. It includes a code expression engine, allowing you to write scripts to automate mundane and complex tasks. Discover how to use After Effects Expressions to quickly & easily create a countdown timer video.

When creating a countdown, you may notice the numbers jumping around. You can try and avoid this by adjusting your text alignment. However, the best way to keep the numbers is a consistent position is to use a monospace font.

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This can help ensure that everyone completes the quiz in a timely manner. Overall, setting a time limit for a Google Form quiz is a useful way for educators, business owners, and anyone else who wants to create and administer quizzes online.

ExtendedForms is by far a great add-on to try timer Google form quiz. It is a one-stop solution for both a countdown timer and proctoring for your quiz/exam. Many features are under pro-version, however, you get the timer feature for free. So go visit the website and install the app now!

I know there are a lot of answers, but I just want to post something very close to OP's question, that personally I would accept as indeed "oneliner countdown in terminal". My goals were:

If one wants a signal when it hits zero, one could e.g. build it with a command that returned a non-zero exit status at zero and combine it with watch -b, or something, but if one wants to build a more elaborate script, this is probably not the way to go; it is more of a "quick and dirty one-liner" type solution.

I have combined terdon's very good answer, into a function which at the same time displays the time since the start, and the time till the end. There are also three variants, so it's easier to call (you don't have to do Bash math), and it's also abstracted.

I'm surprised that nobody used the sleepenh tool in their scripts. Instead, the proposed solutions either use a sleep 1 between subsequent timer outputs or a busy loop that outputs as fast as possible. The former is inadequate because due to the small time spent doing the printing, the output will not actually happen once per second but a bit less than that which is suboptimal. After enough time passed, the counter will skip a second. The latter is inadequate because it keeps the CPU busy for no good reason.

The script can either be used as a stop watch (counting up until interrupted) or as a timer that runs for the specified amount of time. Since the sleep command is used, this script allows to specify the duration for which to count in the same precision as your sleep allows. On Debian and derivatives, this includes sub-second sleeps and a nice human-readable way to specify the time. So for example you can say:

The advantage of sleepenh is, that it is able to take into account the small delay that accumulates over time from the processing of other things than the sleep during a loop. Even if one would just sleep 1 in a loop 10 times, the overall execution would take a bit more than 10 seconds because of the small overhead that comes from executing sleep and iterating the loop. This error slowly accumulates and would over time make our stopwatch timer more and more imprecise. To fix this problem, one must each loop iteration compute the precise time to sleep which is usually slightly less than a second (for one second interval timers). The sleepenh tool does this for you.

cat /dev/zero produces an infinite amount of ASCII zero (\0) characters. pv displays progress, rate limits the data flowing through it and terminates after 60 characters (details below). Finally, the redirection to /dev/null makes sure that the \0 characters are not sent to the terminal.

Found this question earlier today, when looking for a term application to display a large countdown timer for a workshop. None of the suggestions was exactly what I needed, so I quickly put another one together in Go:

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