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  • Also for the link, read the parent topic. One of many things to learn: The slower the CPU speed, the lower the power consumption.

    To do what you're doing at minimum power, there is no need for most of the circuitry on the Nano, including the oscillator (yes you will run at only 8MHz, plenty fast for detecting the interrupt and most other operations).1) Get a bare ATMEG328p chip. 2) Load the Arduino ISP sketch onto your nano. Or, better yet, buy an ISP programmer. eBay has lots of arduino/AVR compatible ones for sale at a decent price.3) Wire up a breadboard to program the chip. (Alternately Since OSH Park has some public designs for AVR ISP with a ZIF, build one of those.)4) Wire up a breadboard to implement your circuit (very similar to the one with the nano)5) Use the LowPower library to manage the power consumption, as recommended by other commenters. --------Another thing to try, if you're up for the challenge, …

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    To do what you're doing at minimum power, there is no need for most of the circuitry on the Nano, including the oscillator (yes you will run at only 8MHz, plenty fast for detecting the interrupt and most other operations).1) Get a bare ATMEG328p chip. 2) Load the Arduino ISP sketch onto your nano. Or, better yet, buy an ISP programmer. eBay has lots of arduino/AVR compatible ones for sale at a decent price.3) Wire up a breadboard to program the chip. (Alternately Since OSH Park has some public designs for AVR ISP with a ZIF, build one of those.)4) Wire up a breadboard to implement your circuit (very similar to the one with the nano)5) Use the LowPower library to manage the power consumption, as recommended by other commenters. --------Another thing to try, if you're up for the challenge, is to see if using the "watchdog" features of the chip can further reduce power consumption by ensuring it's completely off 99% of the time. Below is the link to the official documentation on how to do it. http://www.atmel.com/webdoc/GUID-EAD481FD-28E6-4CD...

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