NRF52840-DK current consumption measurement

[AP040]

Hello, I just started to understand the NRF52840-DK. I want to measure the power consumption of NRF52 with broadcasting some data to air. How I will do it? Is there any example in SDK to put the device in sleep mode and I can broadcast the data.

I want to calculate how many days/months or years my device will work with cell operated.

I am new to this concept to measure the current consumption of the device. So, give some proper steps to do it.

[AP040]

Hi Amanda...!!!

Can you give some example to put nrf52840 into sleep with some configurable time. For example, at every 1 min the board goes into the sleep mode and wake-up when the 1 mins time is over and do some task and going back to sleep for 1min.

[Amanda Hsieh]

Hi, 

It is answered in this thread. 

-Amanda H.

[AP040]

Is this API (sd_app_evt_wait()) is valid for sleep mode?

I have created one app timer for sending advertising packet when the timer event is triggered.

I want system will on at that stage when it is before going to sleep mode. Do not want to restart it.

Is it valid? Advertising packet not working as I accepted. 

static void nrf_data_mgmt_timeout_handler(void * p_context)
{
      NRF_LOG_INFO("#");
}
ret_code_t data_mgmt_timer_create(void)
{
    ret_code_t ret_code = app_timer_create(&m_data_mgmt_timer,
                                           APP_TIMER_MODE_REPEATED,
                                           nrf_data_mgmt_timeout_handler);
    if (ret_code != NRF_SUCCESS)
    {
        return ret_code;
    }

    return app_timer_start(m_data_mgmt_timer, APP_TIMER_TICKS(5000), NULL);
}

/**@brief Function for application main entry.
 */
int main(void)
{
    // Initialize.
    log_init();
    leds_init();
    timers_init();
    buttons_init();
    power_management_init();
    ble_stack_init();
    gap_params_init();
    gatt_init();
    services_init();
    advertising_init();
    conn_params_init();

    // Start execution.
    NRF_LOG_INFO("Blinky example started.");
    advertising_start();
    data_mgmt_timer_create();
    // Enter main loop.
    for (;;)
    {
        idle_state_handle();
        sd_app_evt_wait();
    }
}

[Amanda Hsieh]

Hi, 

The purpose of sd_app_evt_wait() is to do some extra housekeeping for the Softdevice before going to sleep. The function also makes sure that the code does not exit sd_app_evt_wait() unless an application event occurs, such as e.g. UART or ADC interrupt. All the Softdevice examples that use sd_app_evt_wait() in our SDKs should be able to enter sleep mode.

According to your code, it will execute the nrf_data_mgmt_timeout_handler function when the timer event is triggered.

Please take a look at this tutorial.

-Amanda H.