I am extremely new at this so forgive me for any rules I may break…I have a problem I need resolved…
I need to build an odometer it has to have a few things
1.Long life battery need to count for at least a year
2.Has to stay on for the full year- can go into sleep mode and start up once the magnetic switch activates on the first turn but must maintain the count.
- Just need to count revolutions
4.Can use a small screen to view number of revolutions or use beeps/led flash’s to identify number of turns… say <25= one beep/flash etc…
any idea how to do this relatively inexpensive -I really thought spark fun would have a kit for this item…
Cheers
You might be able to hack a pocket step counter (pedometer), like this: https://www.youtube.com/watch?v=jlxXpa_uBw8
If you want to build your own, the long battery life is a problem, especially if you are new at this, and a “small screen” is out of the question unless you use a custom, extremely low power LCD display.
Most microprocessor starter kits, like Arduino, are not optimized for low power modes, but it is reasonably straightforward to build a simple circuit that will run for a couple of years on two AA batteries. Here is a tutorial for the ATmega328 processor: http://www.gammon.com.au/power (Gammon’s site is full of useful information).