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$\begingroup$ I have a multimeter - but I'm not sure how to make FC to output a steady high on RX and TX. If it sends data at high baud rate the multimeter will hardly produce proper measure, as I understand. $\endgroup$
– mvmn
Commented Nov 28, 2023 at 21:10
$\begingroup$ If the multimeter doesn't go higher than the 3.3 you are looking for you should be fine. If you want control over the pad, pinio (in betaflights manual) can help, and if you want accuracy you'll need an oscilloscope where you can see min and max values. $\endgroup$
– ppetermann
Commented Nov 30, 2023 at 6:21

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