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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?

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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. enter image description here But if you don't need so much I/O you can go with a digispark Attiny board. enter image description here

  • To program a pro-mini you need a separate usb-to-serial adapter for programming (or a spare Arduino UNO) – Gerben Sep 4 '18 at 13:02

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