need to know about sensor circuit??!

[kid]

how can i know the circuit are using a sensors?and anybody know what kind of circuit using op-amp and has 2 sensor?
-My english so poor i hope you all still understand my question,sORRy-

 

[Papabravo]

What kind of sensors?

 

[kid]

What kind of sensors?

proximity sensor or infrared

 

[dknguyen]

On op-amp connected to two sensors? What I can think of is that it compares which sensor is detecting closer and which is farther...but doesn't tell anything else other than that...

 

[Hero999]

So what?

What do you want to do with these sensors?

 

[akg]

specify the need excatly .

 

[hawk2eye]

sensor

sensor
Q1 < how can i know the circuit are using a sensors? >
A1 the circuit schematic might help.
.....................................................................................
Q2< what kind of circuit using op-amp and has 2 sensor? >
A2 a single op amp could distinguish btwn 2 sensors.
( see < ATTACHMENT > )

The example circuit gives:
1. IR_1]Lit ; IR_2]Dark then Ein > +1.0
2. IR_1]Dark ; IR_2]Lit Ein < -1.0
......................................................
3. IR_1]Dark ; IR2]Dark Ein =0
4. matched components, IR_1, IR_2 receive equal light
IR_1]Lit ; IR_2]Lit Ein =0

hawk2eye

 

[audioguru]

Why use text to make a simple schematic? It looks like Chinese writing.
I draw straight lines and copy and paste things into Microsoft Paint to make clear schematics.

 

[kid]

sensor
Q1 < how can i know the circuit are using a sensors? >
A1 the circuit schematic might help.
.....................................................................................
Q2< what kind of circuit using op-amp and has 2 sensor? >
A2 a single op amp could distinguish btwn 2 sensors.
( see < ATTACHMENT > )

The example circuit gives:
1. IR_1]Lit ; IR_2]Dark then Ein > +1.0
2. IR_1]Dark ; IR_2]Lit Ein < -1.0
......................................................
3. IR_1]Dark ; IR2]Dark Ein =0
4. matched components, IR_1, IR_2 receive equal light
IR_1]Lit ; IR_2]Lit Ein =0

hawk2eye

i don't understand it......,

 

[hawk2eye]

sensors

Is the ATTACHMENT drawing too hard to understand ?

OR should I explain in more detail ?

hawk2eye

 

[audioguru]

Is the ATTACHMENT drawing too hard to understand ?

Yes.
It is not a real schematic, it is just a bunch of text punctuation marks that don't mean anything.

 

[hawk2eye]

new schematic ( drawn using MS Paint...thank you < audioguru > )

disregard old schematic !

The new schematic example circuit gives:

when infra red sensor is lit, IR_x]Lit <10k
when infra red sensor is dark, IR_y]Dark >200k

case1 IR_1]Lit ; IR_2]Dark Ein > +1.0
case2 IR_1]Dark ; IR_2]Lit Ein < -1.0
......................................................
case3 IR_1]Dark ; IR2]Dark Ein =0

case4 matched components, IR_1, IR_2 receive equal light IR_1]Lit = IR_2]Lit Ein =0

hawk2eye

 

[audioguru]

I don't know why diodes are used when an opamp has two very sensistive inputs that can be used instead like a comparator.

 

[hawk2eye]

sensor

< audioguru>
Please indicate the schematic of your "no diode, op- amp "
proposal .

hawk2eye

 

[Hero999]

Perhapps you should read more about opamps.