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Barometer ====== Barometers reports sea level pressure and not the atmospheric pressure at the place they are installed. Therefore they need to be compensated for the altitude of the installation site. Hobby Boards has an online calculator to calibrate the barometers http://www.hobby-boards.com/catalog/baro_calc.php after calibration check with NOA http://www.wrh.noaa.gov/zoa/mwmap3.php?map=usa Hobby Board Solar/Humidity/Temperature ========================== Check the diagram at: http://www.hobby-boards.com/catalog/links/hts3-r1/Humidity-Temp-Solar%20v3.2%20Schematic.pdf There are two 1-Wire devices on the board and they have different addresses: - the DS18S20 - 1-Wire Parasite-Power Digital Thermometer - the DS2438 Smart Battery Monitor The DS18S20 is the thermometer and therefore you should read the temperature at this device that typically has an address that starts with 10 (mine is 10.07303C020800). Do NOT read the temperature at the other address. The DS2438 reads the Humidity on the VAD side and the Sunlight on the VSENS side. This device typically has an address that starts with 26 (mine is 26.47AD21010000). In owfs just go at the address that start with 10 and read the temperature, then go at the address that starts with 26 and read the Humidity at "Humidity" and the sunlight at "vis". See: http://owfs.org/index.php?page=ds2438 Vis is a real value (the voltage accross R2 - my sensor right now is reading 0.00170870) so typically you should multiply it by something like 10,000 before showing it. Then note the reading when you have full sun and adjust the multiplication factor so that the result is 100 % sunlight. I hope it helps -- Silvano On 10/28/11 7:06 PM, Peter Hollenbeck wrote: Thanks to Silvano Gai's document I have a faintly better understandig of the owfs suite. |
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