# Good low power strategy when operation is "closed" overnight

**URL:** <https://discuss.blues.com/t/good-low-power-strategy-when-operation-is-closed-overnight/2150>\
**Category:** Notecard API\
**Created:** [June 4, 2024, 4:32pm UTC](https://discuss.blues.com/t/good-low-power-strategy-when-operation-is-closed-overnight/2150 "2024-06-04T16:32:07Z")\
**Posts on this page:** 1\
**Showing post:** 6

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**Author:** ![Karl\_iWell](https://avatars.discourse-cdn.com/v4/letter/k/7feea3/32.png) [@Karl\_iWell](https://discuss.blues.com/u/Karl_iWell)\
**Post date:** [June 6, 2024, 6:30pm UTC](https://discuss.blues.com/t/good-low-power-strategy-when-operation-is-closed-overnight/2150/6 "2024-06-06T18:30:17Z")

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We’ve been using a solar powered solution with an ESP32-S3 for tank level monitoring. We wake up every hour and take a reading, transmit it, and go back to sleep. The Notecard is in minimum mode and we haven’t had issues.

As mentioned above, Notecard ATTN line is connected to an ESP32-S3 input programmed to wake up the ESp32-S3.

In this thread [Low-power "mode":"minimum" example?](https://discuss.blues.com/t/low-power-mode-minimum-example/2135) I included some of our code to demonstrate how it works.

Karl

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