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
PCB bottom layer
