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executed Only if the difference between the current time and the previous time is greater than 1,000 milliseconds is the rest of the code executed if((millis() - oldTime) > 1000) { We need to disable interrupts while executing this section of the loop, so the very first thing to do is call detachInterrupt() to disable the interrupt we set up previously Otherwise, comms may fail if an interrupt arrives while the program is in the middle of sending data to the host Note that this doesn't actually remove the configuration for the interrupt, and the CPU will still set the interrupt flag if it's triggered while in the main program loop as explained previously detachInterrupt(sensorInterrupt); The first step is to calculate the amount of flow that has occurred since last time.

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The possible calling convention values are as follows: StdCall Cdecl ThisCall Winapi The default calling convention if not specified is Winapi. This uses the default calling convention for the platform. For most Windows platforms, this defaults to StdCall. For Windows CE, the default is Cdecl.

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This is done by taking the pulse count and multiplying it by 1,000 to convert liters to milliliters, then dividing it by the product of the calibration factor and 60 to convert it from seconds to minutes flowMilliLitres = pulseCount * (1000/(calibrationFactor*60)); All the calculations of flow rate (as opposed to volume) are based on time, so we could assume that this part of the loop executes once per second but that wouldn't necessarily be accurate It will typically be slightly longer than one second and this error will be cumulative if we just assume that we reach this point every 1,000 milliseconds precisely Instead, we calculate the actual number of milliseconds that have passed since the last execution and use that to scale the output.

The calling convention is important since it defines part of the contract between the unmanaged function and your managed code. In particular, the calling convention determines the party responsible for cleaning up the stack. Table 1-1 summarizes the possible choices, as defined in the CallingConvention enumeration. Table 1-1. CallingConvention Enumeration

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Add Watermark to PDFs using iTextSharp – An eye for change….
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That leaves us with this somewhat complicated looking line that takes into consideration the amount of time that has passed and the flow volume in that period flowRate = (flowMilliLitres * (60000 / (millis() - oldTime))) / 1000; This flow volume is then added to the pair of cumulative counters tracking the number of milliliters measured since the counters were reset totalMilliLitresA += flowMilliLitres; totalMilliLitresB += flowMilliLitres; During testing it can be useful to output the literal pulse count value so you can compare that and the calculated flow rate against the datasheets for the flow sensor The next two lines display the raw pulse count value followed by a separator You must uncomment them during testing if you want to make sure that the calculated values you're seeing actually make sense or you need to check the sensor calibration against a known flow rate //Serialprint(pulseCount, DEC); //Serial.

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