I have started work on pulse detector. The idea is very simple.
I need to detect pulse (whenever it occurs) from hall effect sensor and count it.
Then transmit the pulse count along with time(hr:min:sec) & date(mm:dd:yy) information. This data transmission will happen once in a month.
I would like to operate this system on battery (3.6v).
I have to use spi protocol for wireless module interface & may be TWI for RTC interfacing.
The battery should last at least for 5 years.
my doubts are:
1) Will Pico Power Avr serve my purpose ? Which one I should use out of the available list?
3)Should I use external crystal or Internal Rc Osc?
4)Which sleep mode will suit my application?
5) Any other suggestions to make system low power & more reliable.
Thanks in advance !!