how to connect NRF52840 with android application (NRF Toolbox) via bleutooth

[nikola]

Hi ,

I am trying to connect my NRF52840 with the application NRF Toolbox using bleuutooth technology 
when I use this DK 

it works very well and the application detect the device automatically .

but when I am trying with externel debug (connecting with anrduino uno 33 ble) with this device 

It doesn't  work 

Is there  any deference between this two devices and how can I connect this device with the application ?

[nikola]

no I did not use this debug
I connect the external debugging pins of the NRF52840 card which corresponds to the P20 pins with the pins of the arduino nano 33 ble card

[Amanda Hsieh]

Please provide power to nano 33 and confirm by the J-Link Commander as this figure (https://wiki.segger.com/File:nano33_BLE_Connect.png). 

-Amanda H.

[nikola]

I don't have 3.3V power in my DK 
does it work with 5V power ?

[Amanda Hsieh]

See Power supply.

-Amanda H.

[nikola]

this external supply given 3.6 and I need 3.3 
Is that work correctly?