After scanning is turned on, the LED on the PCB board will blink

[Ryon_pan]

hello, I have a question need you help.

SDK:nRF5_SDK_14.2.0

MCU:nRF52810

My product is used as a central.

When the voltage of the battery supplying the product is too low, if the scan slave is not turned on, the LED on the PCB board is normally lit,

but if the scan function is turned on, the LED will flash, as shown in the attached video.

Why does the LED flash when calling the scan function?

The scan function code is as shown below

Nothing special, just call the scan start function（sd_ble_gap_scan_start(&m_scan_param);）

[Karl Ylvisaker]

Hello,

When the voltage of the battery supplying the product is too low

What do you mean when you say that the supply voltage is 'too low'?

if the scan slave is not turned on, the LED on the PCB board is normally lit,

but if the scan function is turned on, the LED will flash, as shown in the attached video.

Scanning requires that the radio is actively listening in RX, which has increased power consumption. Could it be that this increased power draw is limiting the current for the diode, briefly decreasing its intensity?
Keep in mind that I do not know what you mean when you said 'too low' earlier.
You can estimate the current consumption of this using the Online Power Profiler for BLE.

Best regards,
Karl