regarding the sleep mode

[ps_anu]

hi..........

 i want to put my peripheral device in sleep mode ? how to do that?

i tried this one , its shows error 

err_code= sd_power_system_off();

APP_ERROR_CHECK(err_code);

[awneil]

ps_anu said:

its shows error

So what error, exactly, does it show?

[ps_anu]

err_code undeclared (first use in this function)

[awneil]

The 'C' programming language requires that everything must be declared before it is used.

This is basic 'C' - nothing specific to Nordic.

So, when the error says that something is un-declared - the solution is to declare it.

In the code you posted, there clearly is no declaration of the variable 'error_code'.

How to properly post source code:

[ps_anu]

yes i know that meaning , what to declare ? 

[ps_anu]

for system off what i want to declare ?

sleep_mode_enter(); this one ??

[awneil]

ps_anu said:

what to declare ? 

It tells you what to declare!

You need to declare the thing which it told you was  un-declared!