Paper Water Level Indicator Circuit With Paper Transistor

take a paper and penile 

HOW TO MAKE PAPER TRANSISTOR
List of material need
1. Paper (any book are note paper )  
2. Pencil  (any one )
3. LED  (20 mA  small LED)
4. Wire single strand
5. Sticking tape
6. Battery (6 volt 4.5ah or 12 volt 7ah for best result )

draw a transistor shape using pencil

using pencil fill the shape with dark shade

add LED like an image connect  positive to LED anode and cathode to an paper transistor collector using sticking tape

see video for paper transistor 

using pencil draw a ring at base of transistor and fill with pencil shading

please metal glass on top of the ring and connect battery like positive to an LED anode and negative to an emitter of paper transistor 

make a  positive extinction like blue wire for level point  

now dip a blue wire with out touching metal wall  to a water filled metal glass so the positive trigger is given to the base so LED switch off