# Appendix 1

## The Wake Up Pin

The Logger's Wake-up pin is held high, and the logger can be woken up by switching the pin to the ground in one of the three ways shown below, if the pin is switched to the ground for longer than 20ms, it will wake from sleep mode.

<figure><img src="/files/jJBvqyGVkT1tdEHNpz2k" alt=""><figcaption></figcaption></figure>


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