1 wire UV Sensor

Hibernating I would say. Mine worked well, the viewing angle was somewhat narrow (as expected). If you can find the parts (I think you have two sets) and want to build it I’m still able/willing to help as necessary.

Hi everybody

Should I proceed with this conversion for the 1 wire UV sensor ?
Is there anybody else working on a 1 wire UV sensor no sense doing this if somebody else has made more progress
I was thinking of using a hobby board, moisture sensor and interfacing the UV device to this
I need to replace my UV sensor so I could use the old unit to do some experiments
I am having good days and bad days, recovering from biopsy waiting for results
I would like to get this project completed before going on any treatment

mick :slight_smile:

Hi Mick,

I don’t think that the version that Niko devised (and I have 2 sets of parts for - somewhere) was that much ‘advanced’ in so far as the 1-wire interface goes, and as Niko said it’s hibernated for a while now. It was basically just the UV/Solar sensors with appropriate op-amps to produce DC outputs. I certainly hadn’t got as far as deciding how to interface it to my 1-wire net, but the same method as the solar sensor (1-wire battery monitor DS2438Z) seemed like one way to go. I’m not sure if WD already has the capability to take a 1-wire sensor as the UV sensor and plot it ?

I haven’t found where I carefully put the parts for safe keeping yet :oops: but I’m happy to help in any way I can. Niko’s circuit diagrams and the sensor information are still available and I’m sure he will be glad to let you know how to access that info if you would like to.

Cheers
Colin.

Hi Mick

I for one would be interested in the 1-wire interface to the Oregon UV sensors. Your work has been great. Reminds me of my tinkerings about 40 or more years ago. Keep up the good work.

Cheers

:smiley:

MikeyM

Hi
Hi everybody

I’ve worked out how to connect the UV sensor to the 1 wire network
as soon as I finished my lightning radar project, I will start testing sometime next month
mick :slight_smile:

Hi all,

I am certainly keen on building some sort of 1-Wire UV Sensor from scratch. Am considering purchasing a Oregon UVR 138 as a first step with the possibly converting that to a 1-wire if someone could give me a Circuit Diagram of one.

The other thing I was considering was using (as Mike above) a 1-wire battery monitor DS2438Z and either using the VSense+ input or the VAD depending on the output of UV sensor and the Opamp circuit. Anyone got any preliminary designs that would consider sharing?

I did find the following UV sensor and circuits which is a starting point. http://www.kyosemi.co.jp/product/data/en/KPDU34PS1.html

As I have only basic Electronics knowledge, would anyone consider collaborating with me on this? The only issue I see then would be calibrating it accurately.

Colin, I would be keen to talk to you on the phone to see what you have.

Thanks.

Cheers
Derek C
SV Weather, LH, NZ

Hi everybody

I am currently working on a instruction sheet how to convert the UV sensor for the Oregon weather station
so people can have a go themselves or find somebody to do for them

I will also add a page with my suggestions for the 1 wire UV sensor

I will also suggest how to calibrate the unit in whether display

I’m hoping to have all the photographs and instructions completed by the end of this month

mick :slight_smile:

Hello Mick,

That sounds good, will be watching.

Hi everybody

I have now completed, some instructions on converting the UV on my webpage for the Oregon weather station
I have also put a link with some information on my idea
to use this with the 1 wire system

mick :slight_smile:

Hi Mick

Looks like the only sensor available in the USA us the UVR 128. Can I assume the only difference is the wireless freq ??
Thanks for the work on this project.

Cheers

:smiley:

MikeyM

Hi

Yes it will be only the frequency the idea is to replace the transmitter
using your extra temperature sensor, or hobby board moisture sensor seems the best bet
to interface with the 1 wire system

mick

Thanks Mick

:smiley:

MikeyM

Hi MichaelPT,

Can you post the link to your to you info re the 1-wire Solar. Thanks

Regard
Derek Chapman
Stokes Valley Weather
Lower Hutt, NZ.

Hi

http://www.weather-above.com/uv1%20mod%20introductions.html

A question about the instructions, if I may…

In the text below Fig 3 you write

I recommend using a screened cableit is important to measure out exactly 27 inches

I’m intrigued to know the significance of the 27 inches.

PS. I just got brave (reckless?) and took the back off a THGR928N (the only awkward bit is that the top pair of battery connectors are attached to the front so, once you have the screws out, you may need to apply a little pressure on those too to ease the case apart). Once apart you can see that the RH and T sensors (right at the bottom of the case) are well off the PCB (right at the top of the case) and connected to the PCB by thin wires. Mmmmm, I wonder that gives scope for a single ‘extra’ sensor to be the basis for two mods (thus making the most of the limited channels), and if the same arrangement exists in the other ‘extra sensors’, particularly the OS-THGR810, if that gives scope for ‘moded’ sensors on the WMR100 & 200 (for which there is not yet a ‘probe on a wire’ extra sensor)…

PPS. The reassembled THGR928N is working fine. :slight_smile:

btw I found out the UVR128 is completely different internally than the UVR138. I took it apart, but haven’t had time to see if I can found the output of the sensor circuit to interface to the 1-wire network. If I make any progress I’ll post the results.

Cheers

:smiley:

MikeyM

Hi

To bring the UV1 in a acceptable range for calibration you need to place a resistor and the cable length gives a very small resistance
which works out really well and this gave me a standardised measurement
You can use any temperature sensor all you need to do is locate like you have done the thermistor and carefully remove the thermistor and connect
a screen cable to this then follow the instructions about the UV conversion,

UVR128 is my second choice for the modification have not got round to it yet,
is any chance you could take some close-up pictures of the circuit board and circuitry

mick :slight_smile:

Hi MIck

I’ll try to get some pics of the UVR128 for you tomorrow as it’s getting late here tonight.

Cheers

:smiley:

MikeyM

Thank you.

Did you ever find out what the characteristics of the thermistor were on your dismantled probe?

FWIW my (uneducated) guess is that the RH sensor was perhaps resistance based too (looked like a very small white PCB with a zigzag ‘track’ on it). I should have thought to take a picture…

What I particularly fancy is a pyranometer (i.e. direct measure of solar radiation), so I was wondering if there might be any way of combining the Breitling “small PV solar panel as a solar sensor” idea with a modified OS sensor as the transmitter. I suppose that at least part of the trick would be in transposing a voltage range into a resistance range. It’s a long time since I did any electronics at all (and it wasn’t much then!)…

PS. I realise that 1-wire & labjack provide an easy root for voltage range handling, but getting a wired connection between where it’s best for the sensors and where the computers are would be a substantial undertaking…

Hi

I have a old extra temperature sensor unit which still has the probe attached to it, you can get the thermistors from Maplin Electronics supplies

Cannot remember spec as I am recouping from treatment when I get back I will measure the thermistor resistance
at 25c I will measure with the cable and its length and the thermistor on its own

Should not be a problem to get a replacement and calibrate through whether display

I did some work using a pv solar panel will do some more work when I get back I have just got to finish my snow sensor
lol for that rare stuff we sometimes get in the UK,

mick :slight_smile: