Pressure Sensor

[1757]

Hi my team recently ordered one of these:

http://www.digikey.com/scripts/DkSea...rds=734-1003-N

I'm wondering where to start coding this. If someone could provide a java example of how to get it to display the current psi in the system that would be great. Any help is greatly appreciated! Thank you!

[1757]

Edit: I found out it's an analog module. Problem is it's saying it's protected and shows an error when I write
pressure = new AnalogModule(1);
in the robotInit().
Any more help would be appreciated.

[Mark McLeod]

Originally Posted by 1757

Edit: I found out it's an analog module. Problem is it's saying it's protected and shows an error when I write
pressure = new AnalogModule(1);
in the robotInit().

It isn't an AnalogModule.
An analog module is a box that plugs into the cRIO chassis in the first slot. An Analog breakout circuit board plugs into that, then the pressure transducer, an analog sensor, plugs into one set of the available analog breakout pins.

[Mark McLeod]

I won't be much help, since I don't know the Java libraries well.
I do own several of these sensors though and have used them in competition.

This sensor connects to an Analog input and is read using the Java equivalent of Get Voltage.

The voltage (0-5v) will need to be converted to psi if you want a human readable value. To derive the equation you can start with a series of psi readings from a pressure gauge while noting the corresponding voltage reading (just dump the raw voltage to the screen or a print). Then to calculate a best curve fit you can use the LINEST function in Excel. For LINEST highlight two cells and SHIFT/CTRL+ENTER to get both the slope and the y-intercept.

psi = analog_reading *slope + y-intercept

The sensors have slight reading differences between them, but we used the following for our robot this past season:

psi = voltage *29.5433-10.4115 (this was for a different model, so the numbers will be different)

[Joe Ross]

You would use the getVoltage method of the AnalogChannel class.