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February 1, 2010
about 2 weeks ago
I think you forgot to mention under the requirements that you need an amateur radio license to use this. People who are only familiar with devices operating in the unlicensed bands may not realize this, so it might be good to mention in the description.
I was just going to ask if it was a drop-in replacement for the HTU21, but I guess the answer is no. :-(
about 2 years ago
I assume the polyurethane coating holds up to UV exposure better than the epoxy coating on the old models, but has anyone had one of these outside for 6 months or so and can comment on how they look?
about 3 years ago
In case anyone else has this problem, you get to the bearing by pulling the rotating part off. It takes quite a bit of force, so be careful. The bearing is a 5mm ID, 10mm OD, 4mm width sealed ball bearing. I’m going to get another one on ebay and see how that works out.
My anemometer has given up after 2 years, the bearing is locking up every few revolutions. Is this the expected lifetime?
Mine’s been in the Hawaii sun for 2 years. The plastic is a bit bleached and rough, but nothing’s broken yet. (Except something in the anemometer bearings, but I wouldn’t expect that to have anything to do with the sun.)
It’s not obvious to me that the wind speed and cup speeds are the same. There’s some resistance from the cups going upwind, so there needs to be some slip between the airspeed and the cup speed to provide torque. I’d assume the stated value comes from some sort of calibration.
Mine has seen some hard rains, but not 6-12"/h. Maybe 2-3"/h max. It still reports reasonable values, but I have no way of determining how accurate it is.
about 3 years ago
For what it’s worth, mine has been sitting outside in Hawaii for 16 months and about 120" of rain and has held up fine. The red is a bit bleached on the top side, but the plastic does not look compromised, there is no corrosion on the screws and the seal has held. (That is in stark contrast to the SparkFun solar cell powering the unit.)
about 4 years ago
A heads up for people planning to use this for permanent outdoor mounting: The epoxy coating is not UV protected. After 6 months outside in Hawaii, mine has become completely opaque. It’s still functioning, but I have no idea how much power I’m losing.
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