odroid-c2:application_note:external_connector:power_switch [ODROID Wiki]

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====== Power On/Off Switch ======
{{:odroid-c2:examples:hardware:c2boardrevision2_j4.png|}}\\
You can control power supply to **ODROID-C2** while the DC adapter is connected with an external switch (Sliding or Toggle Switch, for example) if you connect such switch to **J4** on the board. **J4** is connected to **NCP372** (Protection IC). There is an ENABLE pin on the NCP372 and it is a low-active and has an internal pull-down resistor for default on.

|| Switch status | Output of NCP372 ||
|| ON(short) | OFF||
|| OFF(open) | ON (+5V)||

<WRAP round alert 70%>
With this hack, we strongly recommend shutting down the O/S completely before turn-off. Otherwise, the file system could be corrupted very easily. In Linux, for example, please make sure to execute **shutdown -r now** or **poweroff**.\\
</WRAP>