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Figure 12-4. Fully assembled tank depth sensor shield Put the shield aside for a while and move on to assembling the sensor housing.

Using a generated interop library and a standard RCW to access a COM component is very easy. However, this approach does have a few disadvantages: A separate interop assembly is generated that must be deployed with the application. Managed code is generated for all interfaces, classes, and types defined in the COM type library. If you are importing a fairly large COM component, this could result in a large interop library.

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Although the basic circuit will be the same regardless of how you mount it, this project has several options regarding how you expose the transducer to the pressure at the bottom of the tank while also exposing it to atmospheric pressure outside the tank. Before starting construction of the sensor assembly you need to think about how it will be connected. There are four basic options for installation. The first, and most obvious, is to fit the Arduino and shield into a weatherproof case mounted just above the tank with one transducer hose exposed to the atmosphere and the other running down inside the tank with a weight attached to hold it on the bottom (see Figure 12-5). This can work in the short term but can cause problems over time due to diffusion of air in the tube into the water in the tank. Eventually, the water level will rise up the hose with the result that your Arduino will be reading the pressure from the height of the top of the water in the hose, not the pressure at the bottom of the hose. If left in long enough, a full tank will appear to be slowly draining until you get an empty reading. Of course, you can periodically pull the hose out of the tank and drain it to restore accuracy, but it s not really a good long-term solution.

Since all COM types are generated, it is difficult to restrict the use of functionality. If a property or method is defined in the COM component, it is available to anyone using the RCW. A generated interop library supports only a fixed set of standard data types. If you need to handle custom data types, custom marshaling is needed. The alternative presented here using C++ Interop solves these issues and should be considered when referencing COM components.

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