justinzane

I've got a cheap, but functional Bluetooth LE cadence/speed sensor -- Jarv CS1505 -- that is quite allergic to water. I ride year-round and was trying to figure out how to protect this sensor when it is in place on the drive-side chainstay. The goal is to wrap the sensor and chainstay sturdily enough to survive the occasional heel-rub and yet not be permanent or so bulky as to risk entangling my foot or the spokes.

[And, I know that there are better-quality, waterproof sensors for sale. I'm trying to use the one I was given, not buy something else. Thanks.]

1 Miyata Biker

Would it be possible to work some silicone grease into the strategic areas on the cadence sensor? It can be cleaned and repeated as necessary, and a small container could be carried on the bike as needed. As long as water "under pressure" didn't get on the sensor, I would think the silicone grease should do the job and be easily removed if necessary. At least it would be a quick and inexpensive experiment.

chaadster

It's taking on water? If so, it's gonna be dead in a minute anyway, so you should just replace.

I suppose you could poke around and see how the water is getting in; I can only imagine an O ring was omitted or has failed on the battery cover, in which case you could probably find an O ring at a hardware store. Maybe just taping over the cover would be enough.

It's hard for me to imagine this being worth your time and effort, however.

Team Sarcasm

two small plastic bags around it

justinzane

Nope... That was my initial attempt. And, unfortunately, the thing still died. Fortunately Jarv Customer Service was kind enough to replace the thing since it is supposed to be water resistant and all I did was road ride on a slightly damp road.

I'm guessing that temp induced pressure changes caused it to aspirate grease and then water when it cooled going from sun to shade.

chaadster

Very unlikely. I'd look to more likely failure modes. Or not; you got a new one.

justinzane

I dug out my self-fusing cable wrap from past RF installation projects. We'll see if that does the trick... If not, oh, well...

justinzane

Sounds like you need a GF with a trust fund...


GF: $$$$$$$$$$$$$$$$$$$$$
Bike: $$$$$$$$$$$
---------------------------
GF - Bike: $$$$$$$$$$

Team Sarcasm

what if I told you....my gf is my bike?

corrado33

Pump it full of silicone/dielectric grease. Non conductive and you can pretty much fill the entire inside with it. Alternatively, take it apart and coat the PCB with a mixture of paraffin and beeswax. See the paragraph on "coating" on this thread.

Homemade PCBS: Potting, Conformal Coatings, Tinning