Description: The Weather Shield is an easy to use Arduino shield that grants you access to barometric pressure, relative humidity, luminosity and temperature. There are also connections on this shield to optional sensors such as wind speed, direction, rain gauge and GPS for location and super accurate timing.
These Weather Shields utilize the HTU21D humidity, MPL3115A2 barometric pressure, and ALS-PT19 light sensors and relies on the HTU21D and MPL3115A2 Arduino libraries. Each shield comes with two unpopulated RJ11 connector spaces (for optional hook up of rain and wind sensors) and a 6-pin GPS connector (for optional hook up of a GP635T GPS module). Finally, each Weather Shield can operate from 3.3V up to 16V and has built in voltage regulators and signal translators.
Note: The Weather Shield comes as a stand-alone board. Headers, connectors, and additional sensors will need to be purchased separately, check the related items or wish list below!
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Note that if you plan to use this in conjunction with the XBee Shield there are some pin conflicts. The XBee Shield uses pins 2 and 3 for serial communication and the Weather Shield uses pins 2 and 3 for the rain and wind gauges. If you don’t plan to use the rain and wind gauges then it “just works”, but if you install the rain or wind gauges then you’ll have to move the serial communication of the XBee to different unused pins.
There is no way to mount the shield properly on the Mega or UNO since the USB shield gets in the way. Secondly, in order to be useful, you have to mount the entire shield in such a way that it is exposed to the raw elements all the time.That becomes problematic with the mega underneath it. So use it to make sure you can interface all the sensors and use the sensors themselves outdoors.
HI, The best way to mount these outdoors would be in a weather meter box like these. http://www.weatherforschools.me.uk/html/weatherboxes.html They protect the sensors from the elements while still allowing access to air for sensor readings.
I have just completed interfacing the WS to a chipKIT Pro MX7 mostly because I wanted to look at the sensor performance. The pressure sensor requires some tuning of the I2C register read function in that there is a delay between when the pressure sensor is commended to take a measurement and when the data is available. The Hold mode doesn’t appear to work at all. To use the No Hold mode, I needed to inset a 50 ms delay between writing the command and reading the measurement. The barometer reads about 2.56 in Hg low. The humidity sensor reads about 3% RH low The temperature measurements between the pressure sensor and the humidity sensor differ by 1 degree F and both read about 6 degrees F high. This may be due to my hardware configuration. These sensor measurements were compared to a General Eastern Model 900 Thermal-Hygrometer.
The light sensor doesn’t appear to have much functionality since the WS circuit board cannot be exposed to the outside environment.
The bottom line is that I believe I will bet better results using sensors packaged individually but it was fun to play with.
Hi, Thanks for the feedback. We have used these in long term outdoor projects (https://learn.sparkfun.com/tutorials/weather-station-wirelessly-connected-to-wunderground?_ga=1.22051570.833401513.1365169143) however, you do need to take specific consideration to how the device is housed outdoors. You could certainly build a system using individual components as well if that’s feels more user friendly. Happy hacking!
I recently bought this shield and weather meters to build my own weather station due to damage to my old system. Setup and programming was easy thanks to Nate’s tutorial. Recommend this product for those weather enthusiasts that want to build their own station,
Nice board. Easy to use. Bug in example code calls “get_wind_speed()” twice per 1 second loop - should only call once, as it needs the 1 second period to calc the wind speed. Called from both main loop and calcWeather.
It’s a great starter for a weather station having a collection of basic environmental sensors and interfaces.
It can be challenging to get the code needed to handle all the sensors, GPS, and connect to the cloud on an Arduino Uno (Redboard). I did!, but resorted to streaming NMEA 0183 standard sentences to another board providing cloud gateway functions.
Some improvements would be to allow remoting of the light/temp/humidity sensors to allow the main board to be protected from the weather and just the essential sensors exposed.
Not sure if it will interface directly with 3.3V powered Arduino’s such as the Due, but with the Photon version I will likely build my next solar powered, cloud connected weather station on the Photon just due to code space.