[Nmweather]

Hi I'm new to the form and weather stations in general, I started with an ancient Davis Weather Monitor II and my plan is to add the 4Pro transmitter and receiver.  At this point I've got the anemometer and rain gauge mounted and wired the the Davis display, once I have the transmitter built I'm going to mount it in weather proof cabinet outside with a backup battery and power it with 12vdc.

   

It's mounted on the roof with a stand made of electrical tubing. 

I made a cart with a supplier based on the BOM for the 4Pro transmitter, while relatively familiar with electronics I am by no means an expert, if anyone has the time to review my order I would greatly appreciate it. My hope is that others can use the cart for their own orders, I added two of  the 915 mhz radio as I will need a second for the receiver. A couple of the items I had to use my judgement to get what I think is the correct equivalent part. specifically:
C6 - BOM calls for 50v but it looks like another 16v part like C5, C7, and C8
IC1 - I believe this the right part but not totally sure
IC2 - I believe this the right part but not totally sure
IC5 -  I believe this the right part but not totally sure, the part in this cart is a two channel
T1 -  I believe this the right part but not totally sure
VR1 -  I believe this the right part but not totally sure, this supplies 800ma at 3.3v but not a "...and 1A Low Dropout (LDO)..."
R14 - I don't see this one installed
RV2- I don't see this one installed
FANLED / TXLED - I ordered two of the same blue LED

Also I'm unclear what this is, don't see anything related to it on the BOM:

   


I really appreciate any help or comments, also if there are obvious ways to save money, i.e. cheaper parts from the same vendor let me know and I can revise the cart to make it more useful for others, this is the link:

https://www.digikey.com/short/73nt5ntb

Thanks  a lot!

[werk_ag]

Hi,

C6 - BOM calls for 50v but it looks like another 16v part like C5, C7, and C8

You are right, C6 should be 16V like C5, C7, C8.
Already corrected on the parts list. Also updated the reference of some IC's for a better identification.

I wasn't able to see your Digikey cart, so can't comment on that.

R14 - I don't see this one installed
RV2- I don't see this one installed

R14 should only be installed when using the WeatherDuino solar cell as Solar Radiation sensor. For the Apogee SP-110 it should not be installed.
RV2 - On the picture it isn't installed but needed if using the UV sensor.

Also I'm unclear what this is, don't see anything related to it on the BOM:

That is an OOK transmitter module. The transmitter can use an OOK radio module or an LoRa radio module (not both simultaneously).
Some additional info on this:
If you intend use the LoRa module, then there is no need to install C4, C5 and VR2 (9V positive voltage regulator 78L09F).

Thank you.
Rgs.

[Nmweather]

Thanks for the response, after looking at the revised parts list I think I've got it figured out correctly but wanted to double check these three, I included the link to the part itself so hopefully that works:


IC5 -  I believe this the right part but not totally sure, this cart is a two channel
https://www.digikey.com/en/products/deta...R7/3767262

T1 -  I believe this the right part but not totally sure
https://www.digikey.com/en/products/deta...LF/6109110

VR1 -  I believe this the right part but not totally sure, this supplies 800ma at 3.3v but not a "...and 1A Low Dropout (LDO)..."
https://www.digikey.com/en/products/deta...G4/1900214

Here is an .xlsx of the whole bom:

Pro4 Transmitter 20210425 (1).xlsx Size: 12,02 KB  Downloads: 19

Cheers!

And thanks.

[werk_ag]

Hi,

IC5 - I believe this the right part but not totally sure, this cart is a two channel
https://www.digikey.com/en/products/deta...R7/3767262

Seems the right part.

T1 - I believe this the right part but not totally sure
https://www.digikey.com/en/products/deta...LF/6109110

I'm not sure if its equivalent to 2N7002: https://assets.nexperia.cn/documents/dat...2N7002.pdf

VR1 - I believe this the right part but not totally sure, this supplies 800ma at 3.3v but not a "...and 1A Low Dropout (LDO)..."
https://www.digikey.com/en/products/deta...G4/1900214

Seems the right part.


By looking to the .xlsx, I'm quite surprised by the prices of some parts. Usually I buy most of the parts from Chinese suppliers (except for some IC's, which probably will be fake). The price of the REG1117-3.3V was the one which surprised me more, $2.80 per unit... that's the price for 50 units on several Chinese suppliers.
Must say that I fully respect those who don't like to buy items from China.

Kind regards.

[Nmweather]

I decided to source from a Chinese supplier, it is substantially cheaper and this is a hobby after all! I made an order with LCSC  and added all the parts needed whether you are using either radio, also in the basket is the US RFM95 radio so you should add the correct radios for your locality (LCSC has the 433 mhz version as well).

Here is a .csv that has all the LCSC part numbers and quantities, simply upload it through their BOM tool and add to your cart to see all the components and their information, right click the link below and replace .txt with .csv:

WeatherDuino pro4 Transmitter _LCSC.txt Size: 6,23 KB  Downloads: 39

I couldn't upload the file with the .csv file extension.

Here is a link to a google doc version of the same, should it be useful, let me know if it is not working.

https://docs.google.com/spreadsheets/d/1...sp=sharing


I believe I have all the part values correct but if someone notices an error let me know and I will correct the csv file, my hope is that others can use this file as a convenient way to place the order without spending the time it takes to select each needed part.

Cheers!

Zac

[Nmweather]

Forgot to note:

I could not find the SMA Connector with this vendor, so it is not in the .csv.
I did not add the two pin header as I have some on hand.

Zac

[werk_ag]

Hi Zac,
Some members of the development team already used the LCSC supplier, and give me a good feedback about their service.
Below is your LCSC part numbers and quantities, in Excel format.

WeatherDuino_4Pro_Transmitter_LCSC_Parts_List.xlsx Size: 13,13 KB  Downloads: 33

I saw you choose the TLV2316IDR instead of AD822, Offset Voltage: ±0.75 mV versus 800 μV

When used in amplifiers of sensors, etc., the input offset voltage of an op-amp results in an error of sensor detection sensitivity. To keep sensing errors below a specified tolerance level, it is necessary to select an op-amp with low input offset voltage.

If you plan to use a solar cell as pyranometer, the output voltages will be very low, as the cell must operate near short circuit zone.
I never try any other OP than AD822, however others may work too, later you will tell us.

Regarding the SMA connector, it can be found easily on AliExpress, through many sellers. Just as an example here is a link to one of them:

https://pt.aliexpress.com/item/100000008...9094%22%7D

...my hope is that others can use this file as a convenient way to place the order without spending the time it takes to select each needed part.

I'm sure it will be very useful for others too. Thank you for your work.

Rgs.
Werk_AG

[Nmweather]

Thanks Werk_AG,  this vendor does not carry the AD822, I thought the other part might be an equivalent substitute but I will just  buy the correct one elsewhere.

Thanks again!

[werk_ag]

Hello Zak,

I also believe the TLV2316IDR will be a good substitute. The AD822 is expensive and start to be hard to find, as it is no more in production.
I'm thinking on order some TLV2316IDR units to try myself too.
Thanks.

Rgs.

[Nmweather]

After a small misstep I got the transmitter built, elected to only install the circuitry I will be using right away so skipped the solar/uv and one of the i2c inputs for now. I'm going to install the AQM and transmitter in a cabinet mounted on an exterior wall with mains power and a battery backup, breadboarded a circuit with a LM388T voltage regulator set to 13.8v to keep the battery topped off and a seperate 7805 regulator to provide 5v to the AQM, seems to work although the regulators definitely require a bit more heat sink than I was expecting:

   

I've got a diode to prevent the battery from feeding into the output of the 13.8V supply, since it's  lead/acid I think it can just stay connected. I can't get any information in CumulsMX, everything just reads zero, I did read that the receiver won't initialise properly without the wind and rain instruments connected so assuming that is the issue? I do get temperature and the air quality information to display on the receiver display and web page. 

Here is a quick shot of the box I'm going to use, it's probably a lot bigger than it needs to be but was very affordable as I bought 3 of them for $20 at an auction, there were a few holes that I covered with some aluminum:

   

My wind sensor is a Davis 7911, found this post :

https://www.meteocercal.info/forum/Threa...vis+pinout

Has anything changed? Seems like this is all the information Ill need.