Hi ankurchanga,
I need to create a little circuit that is triggered by a sensor
The simplest sensor arrangement that comes to mind
is a micro-switch.
the sensor needs to be variable according to how much pressure is to be applied ?
Well, if is just mechanical pressure, like someone
treading on it, then some sort of lever mechanism
would do, maybe with an adjustable screw to set the
operation at a suitable weight.
But if its hydraulic pressure or air (gas) pressure
from about 5 PSI to about 50 PSI then i would suggest
getting the COLDNESS sensor out of an old fridge.
I mean the bit where the temperature control is, its
usually just inside the door.
They usually have a little bellows working a micro-
switch.
Its a cold sensor, but it works by pressure on the
bellows at this point.
Pressure adjustment would be done with the TEMP
control.
Cut off the copper tubing and fix the test pressure
to it, see if the range is what you need.
If its low pressure air (gas) below five PSI then
get a water level sensor from an old washing machine,
you may have to look at a few types, they dont all
use a DIAPHRAGM but most of them do.
Again is just the pressure that works the diaphragm
and operates the switch, but get the whole unit cos
the switches they pick operate at low pressures an
ordinary micro switch would be too stiff.
If none of these are suitable,
then come back with more information as to the use.
Regards, John