Water Level Alarm

Rajkumar Sharma      http://www.rajkumarsharma.com  

354,012 

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

One Response on “Water Level Alarm

  1. 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!

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