Shrubland Park Nurseries Sensor System

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System last rebooted on Sat 18 Feb 2017 at 15:37.

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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 13.6 °C

Local pressure Sea-level pressure
hPain HghPain Hg
1016.5  30.0  1025.0  30.3 

Atmospheric pressure over the last 24 hours


Sensor° C° FLocation
piggy_in 12.0 53.6piggery_in
office 19.1 66.3office
piggy_out 13.6 56.5piggery_out
poly_lh 27.9 82.3Polytunnel Left
propagator 12.9 55.2propagator
poly_rh 33.2 91.8Polytunnel Right
Humid01 28.0 82.3Humidity test
p_house_cr 22.2 71.9Polhouse CR
p_house_cl 21.2 70.1Polhouse CL
p_house_l 20.9 69.7Polhouse L
Openbarn 12.2 53.9Open Barn
Mainbarn 16.5 61.7Main 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 39.9 28.0  82.3  13.1  55.5 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 28.1 0.95 4.100.141334Poly

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