ok i want to create a project in which i want to pass certain powder though a metal way by vibrating it,,now i want to pass that powder and when i have suffient powder i want to close the droping of powder for certain time..then again it should continue the cycle...so for this my logic was to use a load cell..and from the output of that load cell i want to drive a valve that can open and close by vlt(say 5v) ..so i created a simulation in which a variable resistor in wheatstones brige acts like a load cell and the output of load wheatstones brigded are buffered and passed though diffenrtial ampflr and finally though a amplifier with reqired gain..........and the output of this ckt will trigger a switch(through relay) ..n this switch i cooonected to trigger of monostable multivibrator(saw on this site) ..now everthing is working in simulation...the thing is i dont know which valve to use...please suggst any options that are simple.any valve or mechanical switch or any actuator..and is there any load cell that can sense 100gm ,,200gm? ...i am attaching the imagaes of simulator here plz suggest if theres anything wrong yet?
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