Modern Device Forum

Toidus,

This seems like a wiring problem. Double check connections and wires, maybe try switching pins in the sketch and moving wires. Also "beep" out your wires with a meter, there are a lot of low-cost wires on the market that are unreliable.

Otherwise, you may have a broken sensor.

Paul

Matteo, The Rev P is fairly directional - so not a perfect wind sensor unless you put it on a rotating vane. Values fall off pretty dramatically from the backside of the sensor (the board side) with readings being 50% or less. As far as waterproofing, we have poured epoxy over the circuit board with...

WJCarpenter, The BUB is based on FT232 chip, which is intended only as a USB to serial link. To build a ICSP you need a couple more signals and enough digital logic to coordinate them, this implies a dedicated microcontroller. The FT232 chip does not have accessible programmable logic on the chip so...

WJCarpenter, When I designed that board and wrote docs, I thought that it probably had too many options. I don't think too many people have ever tried to add the reverse side regulator. It does require cutting one jumper I remember - and hopefully that is spelled out in the docs. That is because the...

I don't know the answer to this. It might take a few days to get someone to fire one, consult the docs and report back.

Paul Badger

The solder jumper should be shorted if you use the power rail pins. You can see it in the schematic on github which is linked to on the product page. Also you can just probe the pins and and pads with meter to quickly see what is going on. If you don't have a meter, please buy one, you can't get far...

Quite the puzzle. What does Device Manager say on the "no-shows"?

Paul

I also found a few troubleshooting guides for "USB device descriptor failed" errors but didn't go down that rabbit hole at all.
Are the failed devices showing up in Device Manager under USB devices?

With BUBI you need to solder the logic line jumper or they will fail. It doesn't matter what your choice is (I would chose 3.3V though for modern compatibility) but you need to have that jumper installed. I didn't realize you had any BUB I's that you were using. They are definitely not under warrant...

I will try a WIN7 computer, I know they all worked on the WIN7 perfectly. This kind of seems like kind of smoking gun for driver issues. I do know that at one point we were testing boards on our Windows machine and we had to clean out some registry, when Windows had filled up 200 serial ports or so...

Joe, Did you install any of the 3 pin headers? The options can kind of be confusing on that board. If you're using the jumpers, then you need to clear the solder shunts. The solder shunts should be set in the manner shown in the attached image. Did you try putting a meter on the pins 1 and 3 and che...

Joe, Sorry about your experience. It does seem odd indeed. Have you tried the boards on a different computer? Also read about FTDI drivers. It was kind of mess on macs a while ago although the newer Apple drivers seem to have solved the problem which happened with there were TWO drivers installed. I...

The sensor is not a wire, it's a resistor.

All values are linear taper only.

The sensor is a thermistor, a resistor that changes with temperature.

In a more high end hot wire anemometer it would indeed by a "hot wire" a very thin (and very fragile) wire that is heated.

Paul Badger

Thanks. But is the only bit that measures air flow the loop on the longer stalk?

Correct, the other bits are about ambient temperature correction.

Paul

I assume that temperature measurement components can be out of the main air flow.

Correct, as long as they are in ambient air somewhere.

Paul

Absolutely. Wind speed times area = volume / time. You'll need to compensate for temp using gas laws, also humidity comes into play depending on how accurate you are planning to be.

ulrich223, Unfortunately we have seen this before. This is a result of component tolerances that are too close to an edge case where the sensor doesn't function. We are in the process of addressing this but in the meantime, email the shop and we'll replace your sensor. What happens is that in some t...

I would recommend people therefore to reconnect pin 4 of the Opamp (its Vcc) to the 9V bus,

I believed that is was connected after the regulator - I'll check on this.