About Timer Usage on Arduino

[regama19]

Hello Everybody,

I have a question and I need your helps. In summarize;

In my project, I will use a power supply.

It need to work as off mode 47 hours and after that need to work as on mode 1 hours. (47h -> 0V ; 1h 5.5V)

And this cycle will be repeated 34 times.

I can't control this power supply with internal device programming. Because test duration is very long (1593 hours)

Due to this situation I decided to continue with an Arduino device and relay.

If I succeed to programming the Arduino, It will work.

What is the maximum delay time on Arduino ?

I need your help and mentions. Could you help me ?

[paulpaulson]

Hello regama19

Use a Time switch simply.

e.g.

[regama19]

Hi,

It can be difficult I think. Because the cycle (47h+1h) will be repeated 34 times. How can I manage it ?

And also with arduino and relay, it's very cheap. Just I need to learn how much time I can add delay time ?

For example;

Is it possible ?

[paulpaulson]

@regama19

It can be difficult I think. Because the cycle (47h+1h) will be repeated 34 times. How can I manage it ?

And also with arduino and relay, it's very cheap. Just I need to learn how much time I can add delay time ?

You should have to make a market analysis, reading manuals to get answers to these questions.

[Idahowalker]

I'd use millis() for timing.

You want when power is applied to the MCU for the MCU to sit there for 47 hours, then enable for 1 hour. then wait another 47 hours and repeat 34 times and then what? Stop, or repeat.

Your thing is very possible.

Look at File|Examples|02.Digital|BlinkWithoutDelay to use millis() for timing instead of delay().

Info about multi-things

Demonstration code for several things at the same time

NOTE for newcomers. The demo is entirely contained in this Post and Reply #1. There is no need to read further unless you are interested. ...added 25Sep2014 There have been a few occasions recently where newcomers seemed to have difficulty applying the "blink without delay" and "state" concepts to a sketch that is intended to manage a number of concurrent actions. Its very time consuming to respond with suitable code examples - particularly as every case is a little different. I have prepared…

Finite State Machine

https://majenko.co.uk/blog/our-blog-1/the-finite-state-machine-26

[Idahowalker]

@regama19

For example;

Is it possible ?

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Which Micro Controller are you using?

Is this simulator code?

Please describe the problem better then you just did.

[johnwasser]

@regama19

What is the maximum delay time on Arduino ?

For the delay() function:
4294967296 milliseconds
4294967.296 seconds
71582.7882666... minutes
1193.04647111... hours
49.71026962962962... days

[cedarlakeinstruments]

How accurate does the 47 hours need to be? Odd are that you will end up with so much drift from the arduino clock over a 2-day period that you're better off using an RTC module for timing.