I am going to construct an ultra low power timer that will countdown for up to two years and still have enough power to drive a small relay at the end of the countdown. It needs to be portable, but battery space will be substantial. The project is a timed lock. The counter's primary function would be to count down a very extended amount of time up to two years and then be able to drive a secondary power source and low power locking mechanism.
If this purely electronic/mechanical approach isn't reasonable does anyone happen to know a good alternative combinational approach to long term ultra low power countdowns? I have even been trying to find chemical processes that could possibly slowly disentegrate a sample material and suddenly allow full current flow to open the locking mechanism when the sample is fully disentegrated. Any ideas regard these types of electronic/chemical processes or other long term electronic/mechanical processes are welcome.
Let me know if you guys have any insights or suggestions.
Thanks everyone
If this purely electronic/mechanical approach isn't reasonable does anyone happen to know a good alternative combinational approach to long term ultra low power countdowns? I have even been trying to find chemical processes that could possibly slowly disentegrate a sample material and suddenly allow full current flow to open the locking mechanism when the sample is fully disentegrated. Any ideas regard these types of electronic/chemical processes or other long term electronic/mechanical processes are welcome.
Let me know if you guys have any insights or suggestions.
Thanks everyone