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CS106 Barometric Pressure Sensor

7.4 Programming

Short Cut is the best source for up-to-date datalogger programming code.

Programming code is needed,

• when creating a program for a new datalogger installation

• when adding sensors to an existing datalogger program

If your data acquisition requirements are simple, you can probably create and

maintain a datalogger program exclusively with Short Cut. If your data

acquisition needs are more complex, the files that Short Cut creates are a great

source for programming code to start a new program or add to an existing

custom program.

Short Cut cannot edit programs after they are imported and edited

in CRBasic Editor.

A Short Cut tutorial is available in Section 4, Quickstart. If you wish to import

Short Cut code into CRBasic Editor to create or add to a customized program,

follow the procedure in Appendix A.1, Importing Short Cut Code into a

Program Editor. Programming basics for CRBasic dataloggers are provided in

the following sections; more detailed information about multiplier and offset

calculations, conversion factors, long cable lengths, resolution, and correcting

pressure to sea level is provided in Section 8, Operations. Complete program

examples for select dataloggers can be found in Appendix B, Example

Programs.

7.4.1 CRBasic Instructions

The VoltSE() measurement instruction programs the datalogger to measure the

CS106.

VoltSE(Dest, Reps, Range, SEChan, MeasOff, SettlingTime, Integration,

Multiplier, Offset)

At sea level, a multiplier of 0.24 and an offset of 500 will report the barometric

pressure in mbar or hPa. The offset will need to be adjusted if the barometer is

not at sea level (see Section 8.5, Correcting Pressure to Sea Level). If different

barometric pressure units are desired, see Section 8.2, Conversion Factors.

Often the TimeIntoInterval() instruction is used to only power the barometer

while making the measurements. Atmospheric pressure changes little with

time. In most weather station applications, measuring the barometer pressure

once an hour is adequate. See Appendix B, Example Programs, for more

information.

NOTE

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Campbell CS106 Manuale delle Istruzioni Pagina 18