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by sparkyhall
Mon May 23, 2016 6:19 pm
Forum: Weather station
Topic: Connecting wind and rain sensors (build your own station)
Replies: 190
Views: 87170

Re: Connecting wind and rain sensors (build your own station

As I don't have an injector, this will probably be more suitable for me - £13.35 on Amazon. Although I can't find the current capability for any of the selectable output voltages. Your TL-POE10R is rated at 2A at 5V, so I guess it would be similar.... Cheers, Texy It states 5V @ 2A in the back of t...
by sparkyhall
Mon May 23, 2016 11:46 am
Forum: Weather station
Topic: Connecting wind and rain sensors (build your own station)
Replies: 190
Views: 87170

Re: Connecting wind and rain sensors (build your own station

Hi Chris, thanks for pointing out those silly mistakes of mine - I shall correct them and re-post. I am just toying with the idea of POE, and yes it will require a heat-sink, although I am not sure I will end up keeping the regulator or go the active POE route like you - do you have a link for the ...
by sparkyhall
Sun May 22, 2016 7:41 pm
Forum: Weather station
Topic: Connecting wind and rain sensors (build your own station)
Replies: 190
Views: 87170

Re: Connecting wind and rain sensors (build your own station

Hi, it seems the pi version of kicad is a little older than currently available versions and the option to 'load file' , or 'open file' for just the schematic is no longer there. However you can just use 'open with' from within windows directly on the file and select kicad, when eeschama will open ...
by sparkyhall
Sun May 22, 2016 9:57 am
Forum: Weather station
Topic: temperature difference between ground and air sensor
Replies: 24
Views: 4121

Re: temperature difference between ground and air sensor

@jeromec, The weather station board pictures suggest that there are two version of the air board, V1.0 that has the TGS2600 (air sensor) mounted next to the other sensors and V1.1 that has the TGS2600 moved to the edge of the board, presumably because of this issue? V1.0_air_board.png V1.1_air_board...
by sparkyhall
Sun May 22, 2016 7:45 am
Forum: Weather station
Topic: Sensor details and specs
Replies: 19
Views: 3548

Re: Sensor details and specs

Or do I remove some screws and look at the internal gubbins? The cover simply clips onto the base, if I remember correctly you can see the clip that needs pressure at each end. Being a hardware guy I would go look at the internal gubbins, but then I tend to take things apart as soon as I get them. ...
by sparkyhall
Sun May 22, 2016 7:35 am
Forum: Weather station
Topic: Connecting wind and rain sensors (build your own station)
Replies: 190
Views: 87170

Re: Connecting wind and rain sensors (build your own station

Hi I am new to pi and electronics but would love to build this weather station would you be able to supply a list of components and instructions. hope you don't mind me asking. thanks Bart. Hi bart1963 and welcome to the Raspberry Pi forum. I am in the process of writing the build instructions for ...
by sparkyhall
Sat May 21, 2016 2:05 pm
Forum: Weather station
Topic: [SOLVED] problem when powering up after shutdown
Replies: 3
Views: 632

Re: problem when powering up after shutdown

I think you are missing the "file system type" field after the "mount point" field, it should be something like:

Code: Select all

UUID=18A9-9943 /media/usb ext4 auto,users,rw,uid=pi,gid=pi 0 0
replace the "ext4" with the file system type you are using.
by sparkyhall
Sat May 21, 2016 9:14 am
Forum: Weather station
Topic: Sensor details and specs
Replies: 19
Views: 3548

Re: Sensor details and specs

Wow that's a big difference, when I tested mine they were all within about 0.5C of each other, at least once I had moved my cup of tea far enough away. It may be worth placing them in a small sealed box of some sorts to try a isolate them form local heat sources.

Chris
by sparkyhall
Fri May 20, 2016 11:34 am
Forum: Weather station
Topic: Sensor details and specs
Replies: 19
Views: 3548

Re: Sensor details and specs

Actually the weather station appears to use the newer BMP180 rather than the BMP085. You can read BMP180 temperature just as easily as you can read the HTU21D temperature, the python code supplied by the foundation already includes the funtionality to read either. And yes I know that the BMP180 has ...
by sparkyhall
Thu May 19, 2016 9:00 pm
Forum: Weather station
Topic: Connecting wind and rain sensors (build your own station)
Replies: 190
Views: 87170

Re: Connecting wind and rain sensors (build your own station

Oops! I can't believe how many time I have looked at the schematic and not noticed that. Updated schematic attached below: Weather_Station_RevB.zip Sorry for that, Chris The only pcb cad package I've ever used is Eagle, but in order to use these designs Ive installed KiCad. For the life of me I can...
by sparkyhall
Thu May 19, 2016 7:37 pm
Forum: Weather station
Topic: Connecting wind and rain sensors (build your own station)
Replies: 190
Views: 87170

Re: Connecting wind and rain sensors (build your own station

I got the BMP280 working OK using the Adafruit git code from here : https://github.com/adafruit/Adafruit_Python_BME280 and modifying the log_all_sensors.py file. Actually as it's currently the only sensor I have connected at the moment, it is the only valid measurements being added to the database....
by sparkyhall
Tue May 17, 2016 9:12 pm
Forum: Weather station
Topic: Connecting wind and rain sensors (build your own station)
Replies: 190
Views: 87170

Re: Connecting wind and rain sensors (build your own station

Exactly, the MCP3428 also comes in the slightly more DIY friendly SOIC package.

Chris
by sparkyhall
Tue May 17, 2016 7:33 pm
Forum: Weather station
Topic: temperature difference between ground and air sensor
Replies: 24
Views: 4121

Re: temperature difference between ground and air sensor

The HTU21D uses a fixed I2C address space so can't just connect another one to the I2C bus. I think I would be tempted to try putting the TGS2600 (air sensor) on flying leads, say 100-150mm in length. Although this will only help if the TGS2600 is actually heating the HTU21D.

chris
by sparkyhall
Tue May 17, 2016 7:25 pm
Forum: Weather station
Topic: quality of measurements
Replies: 7
Views: 1263

Re: quality of measurements

On my DIY version of the weather station (I use the same HTU21D sensor) over the last couple of weeks I have seen humidity ranges between 30% in the day to 95% at night in my garden. Last night the high was around 89% and the low today around 45%: Humidity.png Although I have nothing to directly com...
by sparkyhall
Tue May 17, 2016 6:01 pm
Forum: Weather station
Topic: Connecting wind and rain sensors (build your own station)
Replies: 190
Views: 87170

Re: Connecting wind and rain sensors (build your own station

@ej3-martin, I don't understand why you are having issues with the RTC, are using the weather station image? I have set this up with both the standard Raspian install and Raspian lite, in both cases I just skip the rtc instructions provided in the link below and go straight to the testing the sensor...
by sparkyhall
Tue May 17, 2016 11:42 am
Forum: Weather station
Topic: Connecting wind and rain sensors (build your own station)
Replies: 190
Views: 87170

Re: Connecting wind and rain sensors (build your own station

My DS18B20 did not include a connector and I do not recall seing them being sold with a connector, clearly this was not a problem for me as I used screw terminals. The DS18B20 can sink 4mA so the actual resistor value is not that important. I concluded that 4k7 was chosen when running the DS18B20 fr...
by sparkyhall
Mon May 16, 2016 9:00 pm
Forum: Weather station
Topic: Connecting wind and rain sensors (build your own station)
Replies: 190
Views: 87170

Re: Connecting wind and rain sensors (build your own station

Oops!

I can't believe how many time I have looked at the schematic and not noticed that. Updated schematic attached below:
Weather_Station_RevB.zip
(6.22 KiB) Downloaded 486 times
Sorry for that,

Chris
by sparkyhall
Sat May 14, 2016 6:50 pm
Forum: Weather station
Topic: Connecting wind and rain sensors (build your own station)
Replies: 190
Views: 87170

Re: Connecting wind and rain sensors (build your own station

As for the Maplins parts, the wind direction sensor is out of stock, but the other 2, well I havent yet found out how to order for delivery - the home delivery box has a red x in it, so you can't 'add to basket'. Texy I have just tried adding the anemometer N96GY and it allows me to add to my baske...
by sparkyhall
Sat May 14, 2016 4:47 pm
Forum: Weather station
Topic: Connecting wind and rain sensors (build your own station)
Replies: 190
Views: 87170

Re: Connecting wind and rain sensors (build your own station

Rather than stripboard, a pcb could be layed out without too much fuss - are you able to supply the circuit as an Eagle or Kicad schematic? Texy I deliberately chose not to do a PCB layout to both show that this project can be made without and to keep the cost as low as possible. I have attached th...
by sparkyhall
Sat May 14, 2016 4:20 pm
Forum: Weather station
Topic: Connecting wind and rain sensors (build your own station)
Replies: 190
Views: 87170

Re: Connecting wind and rain sensors (build your own station

That's correct they are the 6 pin variant with either 2 or 4 pins used. As ej3-martin has stated the anemometer plugs into the wind vane and a 4 wire cable then goes to a single 6 pin RJ11, the center two pins are the anemometer, the two either side of the centre pins are the wind vane and the outer...
by sparkyhall
Thu May 12, 2016 8:13 pm
Forum: Weather station
Topic: Connecting wind and rain sensors (build your own station)
Replies: 190
Views: 87170

Re: Connecting wind and rain sensors (build your own station

Chris, This brilliant. Loving the fact that you managed to use the official software as well. Thanks for posting this, I may need to pick your brains for more details if thats ok. Would you be able to post the circuit diagram? Thanks again. Gimbal Schematic and stripboard layout attached, feel free...
by sparkyhall
Thu May 12, 2016 7:55 pm
Forum: Weather station
Topic: Connecting wind and rain sensors (build your own station)
Replies: 190
Views: 87170

Re: Connecting wind and rain sensors (build your own station

Hi Clive,

I'm happy for you to do whatever you want with it, after all, it was the official weather station that inspired me to do this. I do have more details, I just need to finish writing this up and find a way of making it public.

Chris
by sparkyhall
Wed May 11, 2016 8:25 pm
Forum: Weather station
Topic: Connecting wind and rain sensors (build your own station)
Replies: 190
Views: 87170

Re: Connecting wind and rain sensors (build your own station

@uberscubajim, Thanks for confirming the anemometer calibration factor issue, its good to know I'm not going mad.

Chris
by sparkyhall
Wed May 11, 2016 8:14 pm
Forum: Weather station
Topic: temperature difference between ground and air sensor
Replies: 24
Views: 4121

Re: temperature difference between ground and air sensor

The TGS2600 (air sensor) has an internal 210mW heater. I wonder if this is giving you the offset, especially if you have mounted the air board in confined space.

Regards,

Chris
by sparkyhall
Wed May 11, 2016 8:00 pm
Forum: Weather station
Topic: Connecting wind and rain sensors (build your own station)
Replies: 190
Views: 87170

Re: Connecting wind and rain sensors (build your own station

The whole set-up is powered using a TP-Link TL-POE10R splitter, this provides 5V through the GPIO header. A word of caution when using the TP-Link splitter, it is not isolated, so the pi 0V is sitting at around -42V. This is not a problem when running the pi headless but it is a problem if the pi is...

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