Water Overflow Indicator - SCOPES Digital Fabrication

Lesson Details

Age Ranges
Fab-Modeling.2, Fab-Fabrication.2

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Supriya (Vigyan Ashram)
Supriya (Vigyan Ashram)
Namaste, I am Supriya Kadam.I am electronics engineer and done Fab academy in 2016.I am working in Vigyan Ashram from . Here I am managing Do It Yourself lab (Maker space) and working for new technology development. Vigyan Ashram focuses… Read More


In this workshop student will make an instrument that would sense water overflow and that, it would give an alarm sound or a beep.

In this workshop student will learn about electronic and circuitry through activity. Student will design and fabricate their own water over flow indicator. Student will also create a casing for this circuit system.

What You'll Need

  • AMPLIFIER (SBT-4447)


Tools required :

Soldering gun and Metal, flux

Glue gun

Wire cutter

The Instructions

Introduction to Conductivity.

Conductivity means material which can conduct electricity, heat. Our body conduct electricity thats why we got shock.Metals are Conducts electricity. Copper, Aluminium, Gold, Silver some common good conductor. Utensils conduct heat so it heated while steaming it.

Introduce them with good conductor and bad conductor.

Introduction to a sensor which can detect water.

Sensor means material can sense environmental changes. In our body ears, eyes, nose, tongue, skin are sensors that can sense sound, smell, taste, touch. Likewise in electronics also different types of sensor which can sense Moisture, temp., motion etc. accordingly their names are given. In our project we use Moisture sensor to sense level of water.

Conduct experiment by using 9V cell and LED to show how current flows from water.

Assemble it on bread board.

Connect moisture sensor to amplifier(SBT4447). D0 of amplifier to -ve of buzzer. Vcc of amplifier to +ve of buzzer and +ve of battery. GND of amplifier to -ve of battery.

While assembling introduce them about Digital and analog signals.

Test assembled circuit by taking water in a bowl.

After assembling it connect sensor to bowl and test it. Connections are correct then buzzer gives sounds.

See the connections are neat or not. If they are incorrect then help them to find out the problem.

See the size of circuit and design the box for that.

According to size of circuit designed box to fix it.

Ask students to measure expected size of box and show them online method of box making ex. www.makercase.com

Edit the design as we are going to put alarm , we are going to hang that casing to bucket and space for alarm is also required.

See the size of buzzer and edit designed box for fixing buzzer into it.

Show basic designing tools to students.

Cut the design on laser cutter.

After completing design of box give that design to laser cutter for cutting. Laser cutter is machine which can cut designs in precise manner. we can give our design to laser cutter through machine software.

Introduce them with laser cutter and software.

Take out circuit from breadboard and put it in a box. Now your water overflow indicator is ready.

Separate connections from breadboard neatly. See the connection while separating them from breadboard and fix it into designed box carefully. Now water flow indicator is ready.

Help them to separating connections from breadboard.


  • (Fab-Modeling.2): I can construct compound shapes and multi-part components ready for physical production¬†using multiple representations.
  • (Fab-Fabrication.2): I can develop workflows across four or more of the following: modeling softwares, programming environments, fabrication machines, electronic components, material choices, or assembly operations.

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  1. SCOPES-DF March 8, 2019
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