Water Level Alarm

This project is a water level alarm.


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.

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


Parts List - Connections


PCB Design


PCB bottom layer