How to make detector..?

Question

what did i have 2 do..

i want to do my sem project...

help me

Answer 1

which  detector ? light , Infrared  etc Plz specify.

Answer 2

1. position detectors

2.time

3.pressure

4.temperature

out of all these position switches are the most versatile one. v get a lot of switches in market like proxy switch, limit switch u can use these 2 in almost all the situations.

these detectors r used 4 controlling any system

Answer 3

More details please!

What are you trying to detect?  They make detectors for many things, such as:

smoke

light

radiation

change in water level in a tank

heat

sound

change in air pressure

... and the list goes on.