For really-low-power computing, you may want to consider operating intermittently - unless you have a lot of potatoes, there's not much current available. Some

For really-low-power computing, you may want to consider operating intermittently - unless you have a lot of potatoes, there's not much current available. Something like this may be useful: https://www.sparkfun.com/products/9946 https://www.sparkfun.com/products/9946 Though I believe that chip is more focused on collecting sporadically-available energy (from solar panels or piezos) to run a higher-current device in bursts of activity.