DIY – Water Level Alarm Extensions, Power Switch, Tests [Step 3]

This tutorial is all about preparing the components for permanent perf board assembly, by means of lead extensions and adding a power switch.

  • Watch the Intro Video -> GO NOW
  • Watch the Breadboard Prototyping Video -> GO NOW


I will list the part quantities as if you are going to make a two light, one buzzer alarm. However, you can duplicate the circuit as many times as you want, you will just need to add 1 resistor, 1 transistor, 1 led, and more wire.

  • 2 x bc547 transistors
  • 2 x 220 ‎Ω or 330 ‎Ω resistors
  • 2 LEDs (any colors)
  • 1 x 6v Buzzer (9v or 12v work)
  • 9v battery with applicable clip
  • 1 x on/off switch
  • wires ( a few short ones main circuit connections, 3 longer ones that will stretch from the box to where ever the water tank is. I have successfully tested the circuit over a length of 10 meters)
  • small project case

Tools (not all necessary for breadboard prototyping)

  • Soldering Iron ( 25 – 60w )
  • Solder (60 / 40 )
  • Flux
  • Damp Sponge
  • Helping Hands (third hand)
  • Breaboard
  • Wire Cutters
  • Tweezers (optional)
  • Small cup of water
  • Electrical tape
  • Hot Glue (optional)
  • Heat Shrink (optional, but recommended)

Watch the Video Tutorial

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Author: Joshua Casper

Joshua Casper is an Artist, Musician, and Blogger.

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