Humidity/Thermometer/Solar

[wyleu]

Of the three voltages displayed in the dallas OneWireViewer corresponds to the solar output?
The Oneviewer app quotes a humidity reading for the 2438 how does it know this?
Surely it is only measuring the voltage at the Vad pin? I have read the Dallas App note
http://www.maxim-ic.com/appnotes.cfm/appnote_number/758 which uses a similar circuit to the hobbyboard component.
But I am very confused by the solar sensor as this seems to bear little relationship to the amount of sunlight on the sensor.

Chris

 

[ericvic]

Chris,

If you are looking at the device with the OneWireViewer then channel 2 will have the reading for the solar sensor. The solar sensor is not calibrated to any standard measurement like w/m2.

The humidity tab for the DS2438 assumes a circuit like the one we sell and just does, like you said, a calculation with VAD.

Eric

 

[wyleu]

Thanks for the reply,
so to sum up:

Channel 0 is the Power supply voltage
Channel 1 is the humidity sensor voltage
Channel 2 is the Solar sensor.


What kind of full range deflection should you get on the solar sensor?