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using QueryPerformanceCounter(), how to do i make sure i always get interval of time i need to get. if it is a bit longer, that is fine. that way i know when to fire. let's say, desired pulse frequency is 100khz. anything can be done with elapse time??. i need an example if feasible. Within win32 , firing time may not be what i want.
100Khz (10uS) is difficult to do accurately under windows. There is a fundamental difference between measuring something and triggering something.
Can you provide additional details on what you want to do at this rate?
let's say i need to shine a plant with a special light precisely for 10us and then off , then on. so, On period should be 10us.
It is unlikely that you will be able to achieve an accurate 10us pulse from Windows. It would be fairly simple to generate this with a simple hardware setup consisting of a suitable timer and a FET driver. 10us pulses of light will appear continuous to the eye. It seems reasonable that such a pulse will also appear continuous to the chemical reactions that occur in herbaceous material of a plant.Quote:
Originally posted by galaxy4u
let's say i need to shine a plant with a special light precisely for 10us and then off , then on. so, On period should be 10us.
TDM
There are many standard PCI cards that are around $100 that have the hardware you require (plus more).
That is how I would go.