00:01
So wheatstone bridge circuit we can use as a smoke detector also.
00:05
So first we can have a circuit setup.
00:11
So for a circuit setup this wheatstone bridge have a 4 resistor which we can arrange in a diamond shape.
00:18
This one is 1, this one is 2, 3 and this is a 4.
00:25
This 4 resistor are diamond shape.
00:27
One of the resistors is adjustable which is having potentiometer and which is used to balance the bridge.
00:33
So if i talk about in smoke detector, one of the resistors will be sensing element.
00:49
That means his resistance change with the presence of smoke.
00:52
So in this suppose we have r1, r2, r3 and r4.
00:56
So these are the resistance of 4 arms of this wheatstone bridge.
01:01
Vin is the input and vout is the output.
01:05
So first we need to balance.
01:07
First we can adjust the potentiometer so that it balance the bridge when there is no smoke.
01:20
So in this particular v output is 0...