I would like to waterproof an FR4 circuit board that has no external connectivity requirements other than permanently attached USB cable, but it does have a number of SMD LEDs that must show. Most significant other components are an TSSOP20 MSP430 microcontroller and an LM4970. Power is via a small rechargable 3.7 volt LiPo battery.
Also, the board is to be fitted in a shoe heel(!), so adding an additional waterproof enclosure is not feasible. The water exposure is essentially moisture build-up, not actual soaking (hopefully). The device needs to last just a few months to a year.
What are my options and and what problems would I face?
- If I use potting epoxy, will there be heat build-up?
- If I simply use a see-through latex balloon will that survive circuit board heat?
Is there any additional detail I could add to make this question clearer?
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