Anyone interested in building this for me?

[mirlyn]

Some time ago I bought some components with a view to trying to build a timer/warning device so that a boat driver can monitor session times on the water. To be honest I neither have the time or, as quickly became apparent, the expertise, to do it So I am posting on this forum in the hope that somebody may be interested in either taking on the project, or is able to put me in touch with someone who might. I would be happy pay a reasonable amount for somebody's time and expertise, and of course the components. Alternatively I am could trade some wakeboarding or waterski lessons for it . If just the circuit could be built, I can get it put into a suitable box. If it can be built successfully, I will actually need two. I have been told that it should not be difficult but it is certainly beyond my capabilities.

The device needs to have a countdown timer, with a display for the driver to see. It needs to trigger an audio and visual warning when getting close to a fifteen minute time limit and, when the time is up, to reset itself. It also needs to switch a fairly bright light which which will reflect these actions and can be seen from behind the boat . It was suggested that this could be based on an ARDUINO board. It would draw its power from the boat's 12v system.

The sequence would be as follows:

Timer is started by driver
The digital timer display starts to countdown from 15 mins in seconds
The boat driver will see from the display that timer is running. The light visible to the person behind the boat is illuminated so he/she also knows the timer is running.
At 12 minutes, the driver gets a warning, maybe the display flashes, perhaps once per second. The person behind boat also gets same warning on his light. i.e. flashing once per second.
At 13 minutes 30 secs, the display flashes more rapidly and a buzzer also sounds for 10 secs. indicating to the driver that the time is almost up. The person behind the boat also gets the same warning on his light (i.e. rapid flashing) (may want to incorporate an audible warning too, loud enough for them to hear).
At 15 minutes, the timer automatically resets itself to 15 minutes and automatically restarts. This would continue until the driver intervenes.
At this point the driver has the option to allow it to continue running without interruption for the next 15 minute period and so on, or stop the timer manually, when it will simply reset to 15 minutes and become idle until started again.

N.B. A facility which allows the timings to be customized would be very useful (presumably this could be done with some Arduino code?)

So thats it. Simples! (apparently)

If you think you can help me with this I will be delighted to hear from you.
Many thanks
Mike

[piratepaul]

It is easy but takes time. £500 plus parts...

All the lights and buzzers you want.

Tar&stuff.

[piratepaul]

Here is something like what I have in mind...

2, large water proof 7 seg displays in a box on the back, they could be home made or off the shelf may be expensive?,... they count from 99 mins down to 02 min, then (do not go to 01 min) 60 sec and count down to 00 in secs.
There are 2 smallish 7 seg displays on the dash, there is a button for each display, count 01234567890 to set time.
There is a button for horn set (car horn)3 led lights for 3 horn times press 1, 2 or 3 times.there is a button for roll or stop at 0 and a button for time set.

You can set the time to any time from 1 min to 99 mins, roll or stop. Horn or buzzer to go off at 1,2 or 3 points in the sequence... something like thatish to your spec.

I dont mind helping for free on the forum if you want to build it yourself, but that is a good £500 worth to me to build it on my bench.

Best of luck with it ...

Tar&stuff.

[enCoder]

I have designed and built just such a timing device which drives a relay to switch 240v. It is based on a PIC microcontroller and has a range of 99 mins - 59 secs. It is the heart of a home made PCB UV exposure unit, it has a flashing LED and a buzzer but could be modified with additional relays to drive lamps if required. The PIC code could be easily modified to suit your application.

Unfortunately I am unable to build the system for you at the moment, but I will gladly help via the forum if you want to build it yourself.