Configuring a LabVIEW program to work with the LI-COR light sensors is very straightforward. First, you should configure the input range of the WSN-3202 to an input range of ±0.5 V. This can be set in the Data Configuration section of the NI WSN-3202 Properties window, accessed by right-clicking on the node in the LabVIEW Project.
When programming in LabVIEW, you read the input signal on an analog input channel of the WSN-3202 node via a LabVIEW shared variable. This shared variable returns an unscaled voltage value, which must be scaled to the appropriate engineering units. For instance, if using the LI-190 to measure PAR, you can use the LI-190 specifications to see that it outputs 5 µA per 1000 µmol s-1 m-2. When used with the 604 ohm millivolt adapter, this corresponds to 3.02 mV per 1000 µmol s-1 m-2. An example block diagram of a LabVIEW program that takes a reading, scales the reading to degrees, and displays the value on the front panel, is show in Figure 3. Consult your sensor's specifications for proper scaling factors to use.
Configuring a LabVIEW program to work with the LI-COR light sensors is very straightforward. First, you should configure the input range of the WSN-3202 to an input range of ±0.5 V. This can be set in the Data Configuration section of the NI WSN-3202 Properties window, accessed by right-clicking on the node in the LabVIEW Project.When programming in LabVIEW, you read the input signal on an analog input channel of the WSN-3202 node via a LabVIEW shared variable. This shared variable returns an unscaled voltage value, which must be scaled to the appropriate engineering units. For instance, if using the LI-190 to measure PAR, you can use the LI-190 specifications to see that it outputs 5 µA per 1000 µmol s-1 m-2. When used with the 604 ohm millivolt adapter, this corresponds to 3.02 mV per 1000 µmol s-1 m-2. An example block diagram of a LabVIEW program that takes a reading, scales the reading to degrees, and displays the value on the front panel, is show in Figure 3. Consult your sensor's specifications for proper scaling factors to use.
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