user3540: The Arduino project has done an excellent job in providing a portable software interface to a number of different hardware systems.
Are there any Arduino-compatible systems which are especially applicable for very low power battery-based operation?  Specifically, in an application where a device wakes up periodically (e.g. for data collection) or activated by a user button press?

user39409: Technically you can use any arduino for that purpose with some modifications. I recommend to go with an arduino Pro Mini and remove the LED and the voltage regulator. 
But if you don't need so much I/O you can go with a digispark Attiny board.


3540: <p>The Arduino project has done an excellent job in providing a portable software interface to a number of different hardware systems.</p>

<p>Are there any Arduino-compatible systems which are especially applicable for very low power battery-based operation?  Specifically, in an application where a device wakes up periodically (e.g. for data collection) or activated by a user button press?</p>
 39409: <p>Technically you can use any arduino for that purpose with some modifications. I recommend to go with an arduino Pro Mini and remove the LED and the voltage regulator. <a href="https://i.stack.imgur.com/UV3W7.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/UV3W7.jpg" alt="enter image description here"></a>
But if you don't need so much I/O you can go with a digispark Attiny board.
<a href="https://i.stack.imgur.com/ZLLNb.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ZLLNb.jpg" alt="enter image description here"></a></p>
