GROUP MEMBERS Tanmoy Das (13-23395-1) ARIF ABUL AHSAN (13-23350-1) ALAM, S. M. NUR (13-23467-1)

Submitted TO======>

Overflow ProblemsTo Prevent Wastage Of EnergyTo Prevent Wastage Of WaterAttentionObservationAutomatic Switch Off

1.Bredboard (1 Pcs) 2.Bjt ---BC547 NPN ( 4 Pcs) 3.LED of different color (3 Pcs) 4.Resistence—220 ohm (6 Pcs) 5.Buzzer (1 Pcs) 6. Battery (9 V) (1 Pcs) 7. Connecting Wire 8.A Bowl 9.Water

Here’s a SIMPLE WATER LEVEL INDICATOR CIRCUIT. It is best suited for overhead water tanks to display the amount of water. The circuit consisting of 3 LED’s used to indicate minimum, medium and maximum levels. It is possible to increase the count of indicator LED’s and make it more convenient. The circuit is powered by a 9V battery and it consumes only very less current.

The circuit consisting of 5 sensing probes which is dipped in water to sense the level of water. The probe A is connected as common to other three, which should be at the bottom most part of the water tank, also it act as a reference level. The probes B, C,D, and E are set as minimum, middle and maximum level respectively. Assemble the circuit on a general purpose PCB and enclose it in a casing and mount it with the indicator LED’s pointing out of the box. A short length three, 18 SWG copper wires can be used as sensing probes and for common sensor Probe A, a bare copper wire can be used.

When water in the tank touches the probe A and B both, a small current flows from A to B through water and to the base of transistor T1 via a 220Ω resistor. As a result the transistor conducts causing the LED1 to glow. Similarly, when water touches sensor C, LED2 glow and indicates that the tank is half-filled. Finally, when the water touches sensor D, LED3 glows and indicates the tank is completely filled

Breadboard==250 Tk =============220 Led =====2 TK(per piece)====2*3===6 Bjt=====4 TK(per piece)====4*4====16 Battery (9V)====================40 Resistance=====================10 Buzzer========================20 Connecting Wire================10

Total============322

Water level indicator is used in applications like storage,tanks,boilers e.t.c. to indicate level of water inside.

Easily indicate when water level is full in tank with beep Sound

It can be used to measure any liquid which are electricity sensative

No extra sensor need.Copper wire can be used as sensor.

To save energy To save water Low Cost

Digital Fundamentals-Thomas L.Floyd(8th

Edition)www.electronicsforyou.comhttps://www.youtube.com/watch?v=uQj8GK

QgQxgwww.mycircuits9.com