XIAO nRF52840 bluetooth antenna

I understand that the XIAO nRF52840 has a bluetooth antenna, but I am still looking for ways to improve its range. either ArduinoBLE (library tweaks) or hardware based.

can someone stir me to the right direction, please and thank you…

Also, is 5.5V its max voltage in?

Hi, I don’t think there are additional places for additional bluetooth antenna for wider range, nor the software way. Sorry.
Also, the 5V and 3.3V will be the best input voltage. Otherwise the board might be damaged.
Hope this can help you!

You can improve the range by 10db by adding a small wire to the antenna post.

Make sure you only solder to one side of the unpopulated PDM pins. Or you can solder (carefully) directly to one of the two pins next two each other on the antenna chip.

Thank you. Thank you. Thank you.

It greatly improved and that its RSSI now is pretty much okay.

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Glad your setup worked! Even a small bare wire properly sized would yield good results. I got -75 vs -83 10 meters away.

How long should this bare wire antenna be? It‘s 2g4 right, so Lambda/4?

And can I also do this on the Xiao Sense, after desoldering the microphone (?) at these pins?

Had to do it like this because the PDM has a mic on the Sense-version. Works great so far, despite that I have bridged two pins on the antenna-chip by accident, doesn’t seem to make a difference. I used 0.5mm enameled copper wire ca. 30mm long.

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