black
red
open
green
white
open
open
wire meanings
black - ground
red +5V
green signal to trip the ultrasonic ping, +5V I think, but I do not use it
white 5V signal
This will cable your phidgets three wire signal cable correctly. Remember this is not a normal sensor, it is one of their analog sensors. So you will need one of their a/d boards or interface boards in their terminology. The event that you will want to hook, the SensorChange event. Everything the system reads a new voltage on the port it fires sensor change. See my post on the 888 interface kit to see how to set up the interface kit.
Here is my way of switching the data so you only need one method for any port change.
protected void SensorChange(object Sender, SensorChangeEventArgs Args)
{
try
{
InstrumentType _type = InstrumentType.notset;
int _index = 0;
switch (Args.Index)
{
case 7:
_type = InstrumentType.ultrasonicRangeFinder;
_index = 4;
break;
case 6:
_type = InstrumentType.ultrasonicRangeFinder;
_index = 3;
break;
case 5:
_type = InstrumentType.ultrasonicRangeFinder;
_index = 2;
break;
case 4:
_type = InstrumentType.ultrasonicRangeFinder;
_index = 1;
break;
case 3:
_type = InstrumentType.ultrasonicRangeFinder;
_index = 0;
break;
case 2:
_type = InstrumentType.pressureTotal;
totalPressure = convertVoltageToUnit(_type, Args.Value, _index);
speed = getPressureSpeed(totalPressure, staticPressure, staticTemperature);
break;
case 1:
_type = InstrumentType.temperature;
staticTemperature = convertVoltageToUnit(_type, Args.Value, _index);
speed = getPressureSpeed(totalPressure, staticPressure, staticTemperature);
break;
case 0:
_type = InstrumentType.pressureStatic;
staticPressure = convertVoltageToUnit(_type, Args.Value, _index);
speed = getPressureSpeed(totalPressure, staticPressure, staticTemperature);
pressureAltitude = getGeoPotentialAltitude(staticPressure / units.kPaToPsf);
break;
}
if (_type == InstrumentType.ultrasonicRangeFinder)
{
rangeFinders[_index] = convertVoltageToUnit(InstrumentType.ultrasonicRangeFinder, Args.Value, _index);
}
}
catch (Exception _exc)
{
throw new Exception(className + " protected void SensorChange( Sender, Args) :: " + _exc.Message + "\n");
}
}
There are some other details in this code. Since I use a bunch of helper methods to calibrate the data coming out. Remember the values (Args.Value) come out as a double so you can write a simple linear interpolation for you that will get your data back into usable units from Voltage. For simplicity's sake, I have the interpolation points in an xml config file that is read in at start time to handle each of the instruments. That way the values can easily be changed for recalibration.
The code I have presented is good simple code that is quick and should work for almost any purpose and uses solid error trapping techniques.
