Let's split the requirements into three.
First, outside the house:
Name | Description | Type |
Temperature | Record the current temperature to a minimum of 0.5 of a degree celsius | Must |
Humidity | Record the humidity as a percentage | Must |
Pressure | Record the pressure in millibar | Must |
Wind speed | Record the average wind speed over a ten minute period, record the highest gust over a 0.25 second period1 | Should |
Wind direction | Record the average wind direction over a ten minute period | Should |
Rainfall | Record rainfall in mm | Should |
Sunshine | Record minutes of direct sunshine | Should |
Unattended operation | The device should need no physcial attention. Obviously there will be a need for maintenance, but this should be kept to a minimum | Should |
Low cost | On the basis that it may be damaged or stolen, it would be good to keep the costs low | Should |
Battery powered | Be capable of being powered by batteries for an extended time period. | Must |
Solar charge | Use a solar cell to recharge the battery, hopefully to avoid the need to change the batteries | Should |
Aesthetically pleasing | The sensors should be housed in an aesthetically pleasing housing, suitable for the garden | Should |
Able to cope with being outside | Electronics will need to be kept dry, power must be supplied even in low temperatures. | Must |
No local storage | Recordings should be sent into a central service for long term retention and visualisation | Should |
Secondly, the data storage system:
And finally, the visualisation and end user experience:
Discussions
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