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We use only TXD, RXD, RTS, and CTS connections for OBDuinoMega, so pins 11 through 15 can be ignored. Other than the specific communications pins, the other ones we need to be concerned with are VCC (+5V), GND, PG (program), and RS (reset). VCC and GND connect directly to +5V and GND on the Arduino via the prototyping shield, while both PG and RS are active-low so they need to be biased high to +5V via 10K resistors to disable them. Being able to apply a hardware reset to the VDIP1 under software control can be very handy during development, so also connect the RS pin to Arduino digital I/O pin 12 via a 1K resistor. By setting pin 12 HIGH in normal operation, it s then possible to force the VDIP1 to reset by pulsing it LOW.The schematic in Figure 15-20 shows the connections required from the Arduino to the VDIP1 module.

You have COM components that use different COM threading models. Most use a single-threaded apartment (STA), while others use the multithreaded apartment (MTA) model. How do you change the apartment threading model when making COM interop calls

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Figure 15-20. Schematic for connections to VDIP1 module The VDIP1 module could be mounted directly on the prototyping shield, but for ease of access we decided to mount ours on a subassembly glued in place near the front of the case. We first fitted a pair of 12-pin female headers to the prototyping shield to suit the VDIP1 pinout and mounted the associated pull-up and communications resistors on the shield so that the module could be plugged straight in for early testing. Later we used a pair of 12-pin breakaway male headers and some ribbon cable to make mini extension leads that connect the subassembly in the front of the case to the headers on the prototyping shield

You can set the threading model within your managed code in one of two ways: Declaratively, using the STAThread or MTAThread attribute Procedurally, by calling the Thread.SetApartmentState method

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Most OBDuino and MPGuino units are fitted with a 16x2 LCD module with a Hitachi HD44780compatible parallel interface similar to the unit used in the Water Flow Gauge project in 10. The code has been written to support displays of varying widths and either two or four rows, so by changing a few configuration values you should be able to connect any HD44780-compatible module. We used the schematic shown in Figure 15-21 with both 16x2 and 20x4 versions when building our prototypes.

The .NET runtime creates a COM apartment the first time any COM component is used by a managed thread. Once the apartment is initialized, the threading model cannot be changed. The STAThread and MTAThread attributes are applied to the main method of the application. For example, use STAThread to create a single-threaded COM apartment: [STAThread] static void Main(string[] args) { } Use MTAThread to create a multithreaded COM apartment: [MTAThread] static void Main(string[] args) { } You can also use methods of the System.Threading.Thread class to set the COM apartment model. For example, the following sets the apartment model to an MTA: Thread.CurrentThread.SetApartmentState(ApartmentState.MTA); This sets an STA: Thread.CurrentThread.SetApartmentState(ApartmentState.STA);

Caution The call to SetApartmentState must be made prior to the first COM object being instantiated.

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