hi dev
I have a question about energy harvest over BLE beacon.
As you can see from previous tickets, I'm working on making beacons using energy harvesting.
And now I made a voltage source using energy harvesting. This voltage supply is 3.0V and supplies voltage to the custom ble module for approximately 24ms.
And this voltage source consists of the structure of the tact switch. When I press the switch, 3.0v voltage is supplied to the ble module for about 24ms and ble module programed the beacon code(ble peripheral/ble_app_beacon)is powered on.
I think this 24ms time is enough for the ble beacon to send advertising data to the central device.
but sometimes it doesn't work even though I press the button to supply the voltage .
When checked with the oscilloscope, it was confirmed that power was supplied every time the switch was pressed.
Unfortunately, I don't have a ppk2, so I can't check the exact current consumption, but when I checked through the multimeter, I was able to check that the current of 0.5mA goes in on average.(minimum 0.2mA, maximum 0.6mA)
I will attach the bl code here. But the code I attached will be almost the same as the example of beacon.
#include <stdbool.h>
#include <stdint.h>
#include "nordic_common.h"
#include "nrf_soc.h"
#include "nrf_sdh.h"
#include "nrf_sdh_ble.h"
#include "ble_advdata.h"
#include "nrf_pwr_mgmt.h"
#include "nrf_log.h"
#include "nrf_log_ctrl.h"
#include "nrf_log_default_backends.h"
#include "ble_nus.h"
#include "ble_gap.h"
#include "boards.h"
#define APP_BLE_CONN_CFG_TAG 1 /**< A tag identifying the SoftDevice BLE configuration. */
#define NON_CONNECTABLE_ADV_INTERVAL MSEC_TO_UNITS(160, UNIT_0_625_MS) /**< The advertising interval for non-connectable advertisement (100 ms). This value can vary between 100ms to 10.24s). */
#define APP_BEACON_INFO_LENGTH 0x17 /**< Total length of information advertised by the Beacon. */
#define APP_ADV_DATA_LENGTH 0x09 /**< Length of manufacturer specific data in the advertisement. */
#define APP_DEVICE_TYPE 0x02 /**< 0x02 refers to Beacon. */
#define APP_MEASURED_RSSI 0xC3 /**< The Beacon's measured RSSI at 1 meter distance in dBm. */
#define APP_COMPANY_IDENTIFIER 0x0059 /**< Company identifier for Nordic Semiconductor ASA. as per www.bluetooth.org. */
#define APP_MAJOR_VALUE 0x01, 0x02 /**< Major value used to identify Beacons. */
#define APP_MINOR_VALUE 0x03, 0x04 /**< Minor value used to identify Beacons. */
#define APP_BEACON_UUID 0x01, 0x12, 0x23, 0x34
/**< Proprietary UUID for Beacon. */
static ble_gap_adv_params_t m_adv_params; /**< Parameters to be passed to the stack when starting advertising. */
static uint8_t m_adv_handle = BLE_GAP_ADV_SET_HANDLE_NOT_SET; /**< Advertising handle used to identify an advertising set. */
static uint8_t m_enc_advdata[BLE_GAP_ADV_SET_DATA_SIZE_MAX]; /**< Buffer for storing an encoded advertising set. */
static ble_gap_adv_data_t m_adv_data =
{
.adv_data =
{
.p_data = m_enc_advdata,
.len = BLE_GAP_ADV_SET_DATA_SIZE_MAX
},
.scan_rsp_data =
{
.p_data = NULL,
.len = 0
}
};
static uint8_t m_beacon_info[APP_BEACON_INFO_LENGTH] = /**< Information advertised by the Beacon. */
{
APP_DEVICE_TYPE, // Manufacturer specific information. Specifies the device type in this
// implementation.
APP_ADV_DATA_LENGTH, // Manufacturer specific information. Specifies the length of the
// manufacturer specific data in this implementation.
APP_BEACON_UUID, // 128 bit UUID value.
APP_MAJOR_VALUE, // Major arbitrary value that can be used to distinguish between Beacons.
APP_MINOR_VALUE, // Minor arbitrary value that can be used to distinguish between Beacons.
APP_MEASURED_RSSI // Manufacturer specific information. The Beacon's measured TX power in
// this implementation.
};
static void advertising_init(void)
{
uint32_t err_code;
ble_advdata_t advdata;
uint8_t flags = BLE_GAP_ADV_FLAG_BR_EDR_NOT_SUPPORTED;
ble_advdata_manuf_data_t manuf_specific_data;
manuf_specific_data.company_identifier = APP_COMPANY_IDENTIFIER;
manuf_specific_data.data.p_data = (uint8_t *) m_beacon_info;
manuf_specific_data.data.size = APP_BEACON_INFO_LENGTH;
// Build and set advertising data.
memset(&advdata, 0, sizeof(advdata));
advdata.name_type = BLE_ADVDATA_NO_NAME;
advdata.flags = flags;
advdata.p_manuf_specific_data = &manuf_specific_data;
// Initialize advertising parameters (used when starting advertising).
memset(&m_adv_params, 0, sizeof(m_adv_params));
m_adv_params.properties.type = BLE_GAP_ADV_TYPE_NONCONNECTABLE_NONSCANNABLE_UNDIRECTED;
m_adv_params.p_peer_addr = NULL; // Undirected advertisement.
m_adv_params.filter_policy = BLE_GAP_ADV_FP_ANY;
m_adv_params.interval = NON_CONNECTABLE_ADV_INTERVAL;
m_adv_params.duration = 0; // Never time out.
ble_advdata_encode(&advdata, m_adv_data.adv_data.p_data, &m_adv_data.adv_data.len);
sd_ble_gap_adv_set_configure(&m_adv_handle, &m_adv_data, &m_adv_params);
}
static void advertising_start(void)
{
sd_ble_gap_adv_start(m_adv_handle, APP_BLE_CONN_CFG_TAG);
}
static void ble_stack_init(void)
{
uint32_t ram_start = 0;
nrf_sdh_enable_request();
nrf_sdh_ble_default_cfg_set(APP_BLE_CONN_CFG_TAG, &ram_start);
nrf_sdh_ble_enable(&ram_start);
}
static void log_init(void)
{
NRF_LOG_INIT(NULL);
NRF_LOG_DEFAULT_BACKENDS_INIT();
}
static void idle_state_handle(void)
{
if (NRF_LOG_PROCESS() == false)
{
nrf_pwr_mgmt_run();
}
}
int main(void)
{
//nrf_gpio_cfg_input(6, NRF_GPIO_PIN_PULLDOWN);
//nrf_gpio_cfg_input(14, NRF_GPIO_PIN_PULLDOWN);
log_init();
nrf_pwr_mgmt_init();
ble_stack_init();
advertising_init();
advertising_start();
while(1)
{
idle_state_handle();
}
}
and I use sdk v17.1 and segger embedded stdio.
I want you to look at my ticket and code and give me some advice.
thank you.
