Water Level Alarm

  • Rajkumar Sharma
  • 61368
    Views
  • easy
  • Tested

photo

 

This project is a water level alarm.

Description

Water Level Alarm is a simple project to detect and alarm once the water level in tank or Aquarium reaches at certain level. Circuit is based on popular NPN transistor BC547 which act as switch, Sensor also made on PCB, when the water reaches the sensor PCB, base of transistor connected to positive supply, in consequence transistor act as switch and activate the buzzer.

Specifications

  • Input: 9 VDC @ 40 mA (Supply range 5V to 12V DC)
  • Works good with 9V PP3 Battery
  • Project has two PCB ( 1. Sensor 2. Buzzer driver)
  • Output: Buzzer
  • Buzzer Included
  • Terminal pins for supply voltage
  • Power-On LED indicator
  • Four mounting holes of 3.2 mm each
  • PCB dimensions 32 mm x 35 mm

Schematic

schematic

 

Parts

BOM

Connections

Connections

PCB

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Brian

Great little circuit! How to modify this design so that it will work off electric power (115vac) instead of battery power? Would appreciate your reply. Thanks!

rajesh chandra

I will try.

Pankaj Gupta

Use one door bell & place it near switch of water lifter pump, use two wires one at bottom of tank second at upper level of water, bell will ring when water comes up, use only battery (cell) any body can arrange it

mohamed said

it is good
but how can i combine this idea in arduino micro controller??

ervin

@Mohamed Said
Instead of buzzer place resistor typically 100kOhm would do it (higher if that npn allows it.) then monitor with your arduino between the resistor and the npn transistor. If you see voltage there that means no current so buzzer is off. If you see a short there that means that there is current hence the buzzer would have been on. If you wish to leave the buzzer then the buzzer would act as a resistor. although i was under the assumption that piezo buzzers were ac not dc so not sure how this one buzzer works….

Cosmin

Hello. Instead of the sensor you are using in the setup, can I use a magnetic level sensor?

Alaa

Hi, could I get this circuit with two levels sensor low and high? to know when the tank is full and when is empty

Kiran

We need empty water indicator ckt diagram

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