Simple But Complicated Alarm Clock - Submit your quote

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I need to have this product made, but I honestly have very little time to develop it. So I will award the work to anybody that will be interested. Please PM me with what you think this will cost to get done. I pay via paypal or the cash app.

Here is the project:

I need a system that has a button that I can press to start a counter, the chip has to go in stand by mode and wake up after one year and trigger a voltage on a pin to tun on an LED, the LED to flash 5 times and turn off. Once I press the button again for 10 seconds the timer will start again for one year flash the second led as confirmation. You should be able to press the button once and second led will turn on just to show that there is still battery in the system at any point in time.

  1. The unit has to last for a minimum of one year. two would be preferred or more.
  2. The unit cant be charged, only the battery that was installed.
  3. I have to fit this into a 3mm-4mm thick laminated badge. (so the smallest chip and possibly no other parts. other than a small resistor for the led)

Parts I was looking at but any others are welcomed: The size of the system is 2.5in wide x 1.4in tall x 3/4mm thick. The reason I give these is because the battery capacity. It can be a bit bigger or smaller.
Battery: Something like this shorturl.at/dAFIX
IC: ATtiny85 or smaller anything that can fir on a flex PCB remember there is only 3mm left after the battery if not less.

I can worry about the PCB and dome button and everything else. I mostly need the code to work and to last for as long as I need it with the correct parts.

Any thoughts are appreciated it.

Edit: The count does not have to be exact to the minute or hour. Anywhere in 72 hours will be good. So no need for a calendar day light savings or what ever. I mean it would be nice but I was not able to find a clock on a chip. But any ideas are welcome even if they dont involve arduino. That is just what I knew so that is why i started here.

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For battery I'd be thinking of a CR2032 instead. Or maybe one of the thinner version.

An ATtiny85 with the watch dog timer enabled uses 10 µA at 3V, waking every 8 seconds. Not bad for a chip that old, but it means in one year that'd be some 88 mAh. CR2025 qualifies; CR2016 not.

Much better is the more moden ATtiny202 or 402, which can go down to 0.71ୖµA, for a year consumption of a mere 6.2 mAh. That can be easily done by a CR2016, making that battery you picked look really bulky. These chips come only in SOIC8 package, way smaller than the CR2016. Add two LEDs (0805 or even 0604 size) and resistors (same size) and the whole contraption fits on the back of that battery easily.

Overall size: 30 mm (1.2") diameter - the size of the battery; height: 1.6 mm for the battery + 1.75 mm for the SOIC package + PCB = ~4 mm (0.16"). A small button would not have to add to the size as it can sit next to the ATtiny.

Now just hope the observer doesn't miss those five flashes :slight_smile:

So what do you need?

  • software?
  • circuit diagram?
  • PCB design?
  • assembled PCB?

What time span?

What quantity?