How to minimize power consumption with Semi-Continous Advertising?

[Dani]

Good morning,

In the application I'm developping with nRF51822 anb S110 SoftDevice, the final peripheral product will be installed in a physical non-accessible place. So, the intention is to set the peripheral advertising at a certain interval in order to find a central and be sleeping between advertising periods. The central will be there occasionally, and I think about this way of working, because any button will be accessble in order to switch on peripheral for advertising. Power consumption is very important for our application.

Would you reccommend any timing for the above scenario in order to reduce power consumption?

Do you have any power consumption stimation according to that scenario? (please, for stimation, consider crystal and main components similar to eval board).

(The way of working I'm proposing seems similar as the way bluetooth works in a smartphone when switching on a car: when bluetooth in the car is switched on, it takes just few seconds for the smartphone to connect. So, I guess the mobile is doing advertising every X seconds, right?)

Regards.

Edit: Format, one sentence question, added tags

[Petter Myhre]

You need to find a balance between accepted power consumption and accepted time to find the device. How fast you find the device also depends on what scanning window and interval the central uses. This depends highly on your application.

Ways to reduce power consumption during advertising:

• reduce the advertising interval
• reduce the length of the advertising packets

You can set the advertising interval between 7.5 ms and 10.24 s, if you want to advertise more rare than 10.24 s, you could put the device to sleep, and then restart the advertising.

Please see this question for power consumption estimation for advertising.

This question might be useful as well, focusing on minimizing power consumption in general.

Please vote on the linked questions if you find them helpful.