Hallo Raghunathan,

two further questions:

1. What happens, if your flowmeter or microcontroller will fail? Can your system tolerate this? If the flowing of fluid is caused by a pump, then you could logically link action of pump, flowmeter and microcontroller in such a way, that a failure of one results in a 'protection mode' of whole system. Correct function of flowmeter could be checked by the use of two identical ones, e.g. If a failure occured, pump could be stopped, or so.

2. If a failure condition occurs, must 'massval' have the true value retaining? Think of a brown-out situation, where microcontroller will stop running. If this happens just in the moment of actualizing 'massval', actual value could be lost. In such a case it could be wise to have 'massval' stored at three different memory locations. Actualizing will affect all three per period, but one after the other. If now a write command fails, the two other locations have a correct one. After power-on reset this could be checked and corrected. I don't need to remember, that a good reset controller is essential for this purpose...

Kai