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Author Topic: Laser Sensor for Snow Depth Sensing  (Read 18632 times)

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Offline willper

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Re: Laser Sensor for Snow Depth Sensing
« Reply #60 on: December 24, 2015, 09:22:08 PM »
Brian,

Regarding my screen size. I was able to get everything into perspective except the numbers for "Data Received/Data Quality" and the Alarm button text.

Any thoughts?

Bill
Davis Vantage Pro2 w/usb data logger
Windows 7 home premium operating system
Weather-Display 10.37R Build 81



Online Weather Display

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Re: Laser Sensor for Snow Depth Sensing
« Reply #61 on: December 25, 2015, 05:47:29 PM »
there is no font selection for the number size for data received
(its a small font size by default as the number can get up to the millions)

latest WD update re that snow reference fix
http://www.weather-display.com/downloadfiles/weatherdisplaytest.zip

Offline mikeym

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Re: Laser Sensor for Snow Depth Sensing
« Reply #62 on: January 21, 2016, 06:25:34 PM »
Richard from Porcupine Labs has updated the LRTimelog.exe program to produce only a single reading during it's sampling. This eliminates the problem of the Dallas 1-wire reader program seeing multiple readings during the laser "ON" time.

http://www.porcupinelabs.com/lr4-sample-software

Again Richard has be very helpful updating the software to work better with WD.  Great customer support!  =D>

Cheers

 :D

MikeyM
http://mikeymsweather.com/

Another VERY Happy WD user
Shuttle XS36v4 8 GB RAM
Davis Vantage Pro 2 wireless w/ Davis solar sensor
Laser Snow Depth Sensor LR4/Fluke 414D working in WD thanks to Brian

Offline Breezy

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Re: Laser Sensor for Snow Depth Sensing
« Reply #63 on: January 24, 2016, 03:00:45 PM »
I "second" MikeyM's comment. Great customer support from Richard at Porcupine Labs. His modification to his "lrtimelog" program in conjunction with the Dallas 1-wire reader is most helpful and his efforts are most appreciated.  \:D/

Cheers

Jeff

Offline EastMasonvilleWX

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Re: Laser Sensor for Snow Depth Sensing
« Reply #64 on: February 09, 2016, 02:46:42 AM »
I'll third that :lol:. Richard helped me out with getting the right length cables after fluke changed their board size (my old one burned out). I am also running the new "lrtimelog" and that is slick, works great.

Brian,
I have a request if you get to it. I have my unit setup so that no snow reads slightly negative, because of the heave from the frost, otherwise I will get a false snow depth with certain conditions. So right now I have negative values showing on the daily reports. Could you set it up so that Weather Display will assume 0 for snow depth if we have a negative value?

Does anyone else have this same issue with their setup?

Regards,
-Dennis
East Masonville Weather
Upstate New York
http://eastmasonvilleweather.com


Offline Dale Reid

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Re: Laser Sensor for Snow Depth Sensing
« Reply #65 on: March 12, 2017, 05:47:37 PM »
I'm getting some help from other members who have taken the step to do the laser rangefinder as a snow depth sensor.

Is there a sweet spot for how far from the snowboard the sensor should be mounted? I know there is a minimal and maximal range.  Logic says that you should be at least as far above the board as expected snow fall (sorry for being obvious) plus a bit so that the minimal range is not encountered.

Too far away and one might find that the function is degraded by blowing snow (notice these are all thought experiments as I investigate taking the step of ordering everything.

Also I wonder if one is too close that the ability of the laser to give accurate measurements may be infringed, that is as one gets near the minimal distance, does the % of error increase over the average error in the specifications?  Sort of like humidity sensors that aren't real good as one gets close to 100%, and better in the approx 50-80% range.

If one were to mount a very substantial fixed support at say 4 feet above the snowboard, is this a good range where the laser is giving as accurate results as can be expected, or would a slightly higher distance be better?

Lastly, as I read this info I have understood this to be the chain of events.  Laser/LR4 combo is powered up.  The new version of the Porcupine software is set to take readings every hour or so.  Those values are read by the Porcupine's LRTimeLog, with the snow sensor being plugged into a USB port (NOT INTO A 1-wire port) of it's own.   Then WD is running but uses (somehow) the 1-wire routine to read those data from the laser even though it is NOT a 1-wire device.  Is my chain of reasoning to try to figure this out correct?    Thanks for helping my understand what I'll need to do or if it is doable in my sestting.  The confusing part for me is that so much of WD seems to be set up for 1-wire but snow depth is not connected to 1-wire.

I'm sure I'll get it with a little nudge, but my intuition is fading as I get older!  Please see the attached .jpg as an example of how, to me, some essential info isn't being understood by me. 


Offline mikeym

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Re: Laser Sensor for Snow Depth Sensing
« Reply #66 on: March 14, 2017, 06:26:34 PM »
Dale

Yes, that's correct the the "1-wire reader" uses the data from the LR4/414D connected to a USB port. It's really a nice, but slightly pricey project. Several of us have worked with Brian over the years to get this working. I originally start with ultrasonic sensors and some started with IR sensor and the LR3/411D came along followed by the LR4/414D project. You can check mine out at www.mikeymsweather.com/wxsnowgraph.php

It's working Very well today.

If you need any more info let me know.

MikeyM

 :)
http://mikeymsweather.com/

Another VERY Happy WD user
Shuttle XS36v4 8 GB RAM
Davis Vantage Pro 2 wireless w/ Davis solar sensor
Laser Snow Depth Sensor LR4/Fluke 414D working in WD thanks to Brian

Offline Dale Reid

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Re: Laser Sensor for Snow Depth Sensing
« Reply #67 on: March 14, 2017, 09:35:30 PM »
I hate to see all the trouble this large storm is producing but it answers a question I had.  You are measuring snow depths every  hour and I was thinking that with a big storm that might not be often enough, but your graph shows that hourly makes a nice picture.

By the way, what do you use to graph the snow depth?  Is this from values stored in and/or exported by WD to some external graphing software?
Just curious. 

Now I just need to have the fun-budget get to the point where I can get the LR4 and 414 to start playing.

Dale