Shrubland Park Nurseries Sensor System

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System last rebooted on Sat 27 May 2017 at 10:29.

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Atmospheric pressure

Atmospheric pressure is measured by a Bosch BMP085 digital sensor. Each sensor is individually calibrated and should be accurate to ± 1 hPa.

The equivalent sea-level pressure is also tabulated (but not plotted); this is derived using Babinet's formula from the height above sea level and the local air temperature. The local height above sea level and the sensor to use for temperature are specified in the UserDB. The defaults are zero and 10° C.

Station height 70 m asl. Air temperature 22.5 °C

Local pressure Sea-level pressure
hPain HghPain Hg
1004.3  29.7  1012.4  29.9 

Atmospheric pressure over the last 24 hours


Sensor° C° FLocation
piggy_in 20.2 68.5piggery_in
office 22.8 73.0office
piggy_out 22.5 72.5piggery_out
poly_lh 42.0107.6Polytunnel Left
propagator 21.4 70.6propagator
poly_rh 36.6 97.9Polytunnel Right
Humid01 35.9 96.6Humidity test
p_house_cr 34.1 93.4Polhouse CR
p_house_cl 35.9 96.7Polhouse CL
p_house_l 41.4106.5Polhouse L
Openbarn 22.4 72.3Open Barn
Mainbarn 23.4 74.2Main Barn


Humidity sensors also monitor their local temperature and use this to calculate the dew-point using the "Magnus-Tetens" approximation.

Sensor% humidity TemperatureDew point Location
° C° F° C° F
Humid01 44.0 35.9  96.6  21.7  71.1 Humidity test

Humidity over the last 24 hours

DS2438 voltages

This section is more technical and is for voltages measured by DS2438 sensors. Vad measures 0 to 10V with a resolution of 10mV, and Vis measures -250 to 250mV with 0.244mV resolution. Vdd is the local supply voltage.The charts plot just Vis in mV. Each DS2438 also measures its temperature, but with limited accuracy (± 2° C).

Sensor° CVadVddVisLocation
poly_light 37.7 1.33 4.190.131570Poly

Vis (mV) over the last 24 hours

Sensor and system information

System and software © FieldSolutions Glasgow. For more information email 1wire at fsolv dot co dot uk