https://devzone.nordicsemi.com/f/nordic-q-a/19243/nrf51822-mbed-low-power-how-to-achieveHi, I hope you are doing well. I am working on nrf51822 project. I want the nrf51822 to advertise for 5 secs and then sleep for say 30 mins or an hour and then wake up and advertise for 5 sec. I also want to use BLE UART services as well when iten-USTelligent Community 13Thu, 26 Jan 2017 13:58:30 GMThttps://devzone.nordicsemi.com/thread/74549?ContentTypeID=1Thu, 26 Jan 2017 13:58:30 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8e90af20-2546-43f1-aa55-640ec3c82a6bJ&#248;rgen Holmefjord<p>Hi,</p> <p>I&#39;m not sure how much control you have of the power consumption when using mbed, but according to <a href="https://developer.mbed.org/questions/4693/Lower-power-Mode-Nordic-nRF51822/">this thread</a> the BLE_Beacon example consumes 35µA, so 1.2mA is quite a lot. It is possible that your board is running in debug mode. Try power cycling the board and power it from battery or external source before doing power measurement to get correct readings.</p> <p>What are you running in your code? How are you entering sleep mode? I think ble.shutdown(); will only disable the softdevice, and you will have to put your device in sleep mode afterwards.</p> <p>Best regards,</p> <p>Jørgen</p><div style="clear:both;"></div>