Sealed, waterproof BLE device...how to wake up?https://devzone.nordicsemi.com/f/nordic-q-a/2402/sealed-waterproof-ble-device-how-to-wake-upI&#39;m working on a device which may spend months, or even years as deep as 1000 ft underwater...a harsh environment. Accordingly, the PCB will be completely encased in plastic (potted or overmolded). We&#39;d like to use the nRF51822 SoC since it would allowen-USTelligent Community 13Thu, 01 May 2014 11:01:06 GMTRE: Sealed, waterproof BLE device...how to wake up?https://devzone.nordicsemi.com/thread/9783?ContentTypeID=1Thu, 01 May 2014 11:01:06 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1363fca8-783a-416d-94e4-07b22b487e33Ken A. Rederg&#229;rd<p>Perhaps the internal temperature sensor can be used to trigger BLE advertising ?</p> <p>If the delta temperature for a time interval is above a threshold it triggers the BLE advertising ? Or perhaps a temperature threshold is enough ?</p> <p>BR, -Ken.</p><div style="clear:both;"></div>RE: Sealed, waterproof BLE device...how to wake up?https://devzone.nordicsemi.com/thread/9784?ContentTypeID=1Thu, 01 May 2014 00:41:06 GMT137ad170-7792-4731-bb38-c0d22fbe4515:43031b66-f53f-46a2-b138-f9323d95d649mtsunstrum<p>Consider a photo diode light type detector, connected to nRF51822 GPIO input pin.</p> <p>Have a translucent window port to the photodiode detector. Have this window port covered normally. Remove, shine light in it, and let it wake up that way ...</p><div style="clear:both;"></div>RE: Sealed, waterproof BLE device...how to wake up?https://devzone.nordicsemi.com/thread/9782?ContentTypeID=1Wed, 30 Apr 2014 21:21:19 GMT137ad170-7792-4731-bb38-c0d22fbe4515:db9ccea6-21ba-4db9-b4d4-2f031f477b4cSteve Muebreg<p>My only reservation about the reed switch is that the end user will have another piece of hardware (the magnet) to keep track of.</p> <p>Would be interested to hear more about the piezo option, and how you implemented it...</p><div style="clear:both;"></div>RE: Sealed, waterproof BLE device...how to wake up?https://devzone.nordicsemi.com/thread/9781?ContentTypeID=1Wed, 30 Apr 2014 21:13:14 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c47fc72b-8821-43cf-ae81-526ae0aae506syntroniks<p>I have successfully used a piezo as an io transducer with these devices. A reed switch should work nicely</p><div style="clear:both;"></div>