Wireless, or power line modems. Bare minimum electronics in humid area.=20 I have to assume the water would not be distilled quality, but contain=20 all sorts of ions, make it conductive, corrosive, and make deposits when=20 evaporation occurs. None of these are good for electronics, or even high=20 voltage power lines. Cleveland has a length of high voltage (11kv ??)=20 feeder lines near an interstate highway at a higher level. The road salt=20 spray has shorted these lines, taking them out of service with some=20 major important (airport) customers. It is now routine, several times a=20 year to have linemen wipe the insulators with damp rags. On 7/24/2010 8:48 AM, V G wrote: > On Sat, Jul 24, 2010 at 8:39 AM, Olin Lathrop = wrote: > =20 >> V G wrote: >> =20 >>> I am concerned that water from the air may condense on the PCBs and >>> cause problems (such as undesirably conducting electricity, and so >>> on). Should I be worried about this? >>> =20 >> Yes. >> >> =20 >>> If so, what can I do about it? >>> =20 >> Put only the sensors in the chamber with the electronics in the normal r= oom >> environment. That's what wires are for. >> =20 > That would not be practical. The chambers themselves are quite large, > and the room that the chambers are stored in is itself quite humid. It > would not be practical to run long wires into the chambers (especially > those for SPI, I2C, and 1-wire communications intended for short > distances). > > Would coating the PCB and electronics with some sort of spray help to > prevent problems caused by water? Any other ideas? > > =20 --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .