I am looking for a small timer that I will buy with a "built-in time" that will come from the factory with 3 minutes (for example, it can be changed at the factory) and every first press will activate it (beep that we know we will press) and it will beep after 3 minutes 2-3 beeps . I need something very cheap and most "stupid" without a monitor without how much time remains and so on.
If there is such a size of a coin - I'll be happy
*pic att.
Thanks!!

 

So all you want is the start button and an buzzer?

What exactly is your question? Do you want to make said device, or looking to buy one? If it is the latter, I think you may have a tough time. The former would be quite easy to do.

 

Thanks for the answer,
im looking to buy 1 (or 100,000+ to be more accurate but i need to find who can make them, but i dont even know where to start looking. i tried looking in Alibaba in "timers" section but its the wrong place to look for. any suggestions?

 

Thanks for the answer,
im looking to buy 1 (or 100,000+ to be more accurate but i need to find who can make them, but i dont even know where to start looking. i tried looking in Alibaba in "timers" section but its the wrong place to look for. any suggestions?

That's such a niche item, I'm not surprised you can't find it. I assume you will have to have it manufactured yourself. Since you are wanting to buy so many, that shouldn't be an issue

 

Tnx Kyleh,
I'm willing to find someone that can manufacture this, but i dont even know who is my address.....
What similar items I need to look to find that manufacturer? who can fit me in Alibaba?

 

To be clear:
All off
Press button > One beep
3 minutes later > 3 beeps
All off

Is that it?

1. After the first cycle is complete, does the unit go back to the off condition, or does it beep again every 3 minutes?
2. How loud does the beep have to be?
3. What happens if the button is pressed again in the middle of a timing cycle:
a) cycle restarts, delaying the 3 beeps.
b) button press is ignored > 3 beeps happen 3 minutes after the first button press.
c) cycle is canceled > no ending beeps

Whatever the answers, this can be done easily with logic chips. But for size and cost, nothing will beat a small, micro-power PIC or other microcontroller. For size and battery life, it would be similar to an automotive key fob.

ak

 

To be clear- you totally understood
1.going back to off condition, not beeping every 3 min
2.not loud at all (not like an alarm clock or smoke detector pretty quiet
3.(a)if it press while the 3 min is going it will start again, like a kid that press hid toothbrush by mistake and "NOW" he really want to brush
battery life should be very short, the cheapest/lowest battery /voltage there is.
Tnx for the help!

 

Low power PIC
Tact or dome or conductive rubber switch
piezo beeper element
small lithium coin cell

No resistors or capacitors.
The PIC is so close to the battery that no additional decoupling is needed.
The PIC has internal pull up for the switch.
Two PIC outputs provide differential drive to the piezo element.

Add firmware, shake well.

ak

 

OK google translate needed
tnx for the help, but surly i didnt understand....
any chance u could refer me to some place that selling 1 of this? for me its too complicated
but lots of thanks.
btw, what the key word i need to look on Alibaba for example?

 

This is a highly specialized little timer application. I almost guarantee that you will not be able t buy one pre-made.

Translations:
A PIC is the generic name for the worlds most popular line of small microcontrollers. While the product line has gotten into larger devices with amazing performance, they still have some very small (8 pins) parts specifically designed for low power, simple tasks. For example, many automotive key fobs, garage remote controls, security systems, etc. use them. The part has a reasonably accurate on-board clock oscillator, so you don't need an external crystal. It has pull up resistors on its inputs so you don't need an external one for the switch input. The switch can be any low cost technology; I mentioned three as examples. A small piezo element is what is inside many little beepers like in coffee makers, etc.

My point is that the application is so simple and so small that the entire bill of materials is one chip, one switch, one beeper, and one battery. The PIC costs less than $1 in low quantities. Someone has to write the program for the part to become a timer/beeper, but that one-time cost is way outdone by the parts savings compared to an all discrete design.

ak

 

The PIC die is 10 cents the piezo is 5 cents and the board with touch sw is 15 cents. The case is 20 cents and battery 8 cents. Assembly is 10 cents Packaging will be 10 cents Programming is 10 cents.
You can count on the total cost of about $1.00 USD when you incl printing and drape forming blister pack.
Min quantity would be 20,000 units.

Get your cheque ready. Elecrow will do it.

 

Going to work on it a bit,
lots of new stuff to learn,
thanks!!!