RE: Custom PCB: no BLE

Dieter — Mon, 27 Aug 2018 14:31:43 GMT

Hi Nguyen,

just to follow up: The 32MHz crystal was ok, the configuration too. The PCB layout is unusable. I've sent a board for RF-analysis (I don't have the tools here) and got some instructions how to disable the on board chip antenna.

I soldered a 29mm wire to the pad and it works! (a coax cable and wifi antenna from an old router works too)

...but not on my Huawei P20 lite. Should someone else have this phone, I can't recommend it as for some reason it does not see my board. The old Samsung S III mini works just fine, even with the wire as antenna. I'll use that :-)

Meanwhile I've got all my boards running with bluetooth.

Thanks!

RE: Custom PCB: no BLE

Nguyen Hoan Hoang — Fri, 29 Jun 2018 00:36:51 GMT

First thing I would check in this case your 32MHz crystal. Make sure that it work. To check that, just enable it in the code, if it hangs then your oscillator is not working hence no RF signal. Second thing was it solder in the correct position and reversed ? Even if the RF section was not fully tuned, you should see something with very weak RSSI.