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Arduino inputs can read values between 0V (ground) and the operating voltage of the CPU, which in the case of most Arduino designs is 5V. Some Arduinos run at 3.3V but they are the exception rather than the rule. What this means for an Arduino-based oscilloscope or logic analyzer is that it can only be connected to circuits that run in that same voltage range. If you run in analog input mode and try plotting the waveform of an audio signal running through an amplifier at 36V, you'll probably blow the Arduino input if not the whole chip. Conversely, if you run in digital input mode and try to read the status of data lines on a 3.3V or 2.6V circuit, it might not be able to read a HIGH value because the voltage level of the system under test isn't high enough for the Arduino to read. The solution to these problems is to apply a prescaler in the probe itself before the level is sent through to the Arduino for measurement. Scaling down a high voltage to a safe level for the Arduino to read is quite simple using a voltage divider formed from two or more resistors. The principle of a voltage divider is that if you place a voltage across several resistors in series, the voltage at the points between the resistors will be a fraction of the total voltage. This can be demonstrated by building a special input probe that uses a voltage divider connected between the probe input and the shield (ground) connection to bias one end of a divider network to 0V, with the other end of the network connected to the probe tip and the middle point connected to the probe input on the Arduino oscilloscope (see Figure 11-12).

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//unmanaged utility class public class CStringUtility { public: //modify the string static wchar_t* ProcessString( const wchar_t* stringIn) { size_t bufSize = wcslen(stringIn) + 50; wchar_t* pResult = new wchar_t[bufSize]; wcscpy_s(pResult, bufSize, stringIn); wcscat_s(pResult, bufSize, L"AddedString"); return pResult; } }; } #pragma managed The code accepts a const wchar_t* as an input parameter, appends a literal to the string, and returns it. Using the PtrToStringChars method, we can write managed code like this: #include "StringUtility.h" #include <vcclr.h> using namespace System; using namespace MixedSharedLib; public ref class ManagedStrings { public: void ChangeTheString() { //get internal pointer to managed string pin_ptr<const wchar_t> pStr = PtrToStringChars(m_Target); //pass the pointer to the unmanaged method wchar_t* pNewStr = CStringUtility::ProcessString(pStr); //update the managed string with the result m_Target = gcnew String(pNewStr); //free the pointer to the new string delete [] pNewStr; } property String^ Target { String^ get() {return m_Target;}

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void set(String^ value) {m_Target = value;} } private: String^ m_Target; }; The code uses PtrToStringChars to obtain the interior pointer to a managed string object. It uses the pin_ptr keyword to pin the memory for the interior pointer. Pinning the memory prevents the string from being moved within the garbage-collected heap. When the pin_ptr goes out of scope, the memory is released from the pin and can be moved in memory if necessary. The pinned pointer is then passed to the unmanaged ProcessString method. The result of that method call is a new string that is returned as a native wchar_t*. We then create a new System::String object that contains a copy of the returned wchar_t* string. Finally, we remember to free the memory for the native string that was returned. Code to test all of this looks like this: ManagedStrings^ obj = gcnew ManagedStrings(); obj->Target = "abcdef"; Console::WriteLine("String prior to call: {0}", obj->Target); obj->ChangeTheString(); Console::WriteLine("String after call: {0}", obj->Target); We get these results from executing the test: String prior to call: abcdef String after call: abcdefAddedString

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Create Thumbnail Image from PDF using Ghostscript - CodeProject
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Batteries can either be rechargeable (secondary cells) or non-rechargeable (primary cells). Within each category there is a vast array of different battery chemistries and capacities. Key figures for batteries are the terminal voltage (V) and capacity, typically measured in ampere-hours (Ah), which give an indication of how long they can provide power before being discharged. The standard 9V PP3 battery is really only a good choice for very low-current applications, perhaps a project that drives one or two LEDs and/or an LCD. Three or four 1.5V AAA, AA, C, or D cells provide a great deal more capacity at the expense of size, particularly for C or D cells. But, if you re driving motors, servos, or solenoids, you ll want to aim for C or D cells as a minimum to get any reasonable battery life.

However, as long as the calling conventions specified by the unmanaged function and your managed code agree, you shouldn t have to worry about the differences in decorated names. In the example, by specifying Cdecl as the CallingConvention in DllImport, .NET interop correctly matched the entry point names. On the other hand, if the function were defined in C as __stdcall, but we incorrectly defined it in managed code as CallingConvention.Cdecl, the names would not match. In this case, the function call would fail because it could not find the correct entry point.

A crude but effective trick when powering 5V circuitry from a 6V battery is to put one or two diodes in series with the supply. The typical forward voltage drop of 0.4V per diode brings the 6V down to a more ideal 5.2V and you get reverse polarity protection for free.

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Generate a pdf thumbnail (open source/free) - Stack Overflow
Matthew Ephraim released an open source wrapper for Ghostscript that sounds like it does what you want and is in C#. Link to Source Code: ...

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Create , show, display multiple image formats thumbnails for PDF file, such as jpeg, png, gif, bmp, etc. C# sample code included for quick creating PDF thumbnail ...

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