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Spearfishing Walkie Talkie

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--- Quote from: waymond91 on October 17, 2021, 10:40:41 am ---Ok this is so foreign to me! If somebody outside the field told me this was the case with potting electronics I would have told them they’re crazy. Its not just a matter of picking a different porting compound then?

My RF design is pretty horrible, which is a problem given the project is all radios. I was considering using ESP NOW to remove the LoRa transceiver…

Clearance around sensitive parts makes a lot of sense. I don’t suppose you have experience potting audio components?

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If the question was directed at me, sorry, no experience potting audio

Haha yes sorry struggling to use the forum on my phone.

RF is almost black magic, dielectric materials indeed have a huge effect on things. This is why you typically can't use ordinary FR4 PCB material at microwave frequencies and fancy exotic substrates exist. The losses when using fiberglass PCBs would be far too high for most applications.


--- Quote from: waymond91 on October 17, 2021, 10:34:50 am ---
--- Quote from: mikeselectricstuff on October 17, 2021, 09:19:27 am ---You only need to detect a sudden change in pressure, so pressure from water shouldn't be an issue as long as you have enough sensing range. You might also want to look at using an accellerometer to detect a tap or shake in specific directions.

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Ok that makes good sense.The accelerometer seems like a winner since all the changes can be made on the PCB without fiddling with the enclosure. Plus it should be easier to take theU from a deep sleep since it can probably generate an interrupt…

I swear I considered the accelerometer but I talked myself out of it because I seemed to think it would produce too many false positives when worn.

I know that a lot of them you can set some detection thresholds…

Just wondering, is there a part off hand you have worked with or can think of?

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they are all very similar, though pinouts and register maps vary a lot. At the moment the biggest issue is finding any that are in stock :-(


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