Introduction: Make a Cheap Fire Fighting Robot at Home.

Wanna make a security project for your college submission or may be for your personal use? Then Fire Fighting Robot is a great option!

I made this prototype as a final year project in about 50 USD. See the demo video above.

This robot is operated on 24v/2amp DC supply which we'll get from a single transformer. To make this project easy to make by everyone I haven't used any microcontroller in it.

The component list is pretty long. so you can download the complete list from here.

Please make sure to bookmark this page for future references or you can download step-by-step project maker guide (pdf) for in-depth details from engineers factory.

I've divided this project in 5 segments. Each of them has their own components and requirements.

These 5 segments are:

1. Basic robot for mobility.

2. Remote controller.

3. Power supply.

4. Direction finder mechanism.

5. Water spreading system.

Step 1: Make Basic Robot.

In this segment you have to make a basic robot on which all the motors and other stuffs can be assembled.

Just grab the chassis and assemble all the 4-DC motors on it. Now attach tires on these motors on-by-one.

The assembled basic version of the robot will look like above image.1.

You can see the internal connections from Image.2 above.

After this, the 'Basic Robot' segment is completed.

Now head over to the second part.

Step 2: Making Power Supply.

Power supply is important.

You've to run total 6 motors from this power supply & 1 dc pump with their respective power needs. In which-

1. Four DC motors with 12v. (Image.2)

2. Two Micro Servo Motors with 5v. (Image.3)

3. One Dc Submersible Pump with almost 18v-24v. (Image.4)

For every set of motors(above mentioned) their power supply would be separate. But we'll divide their needed power from one single 24v transformer.

Let's make it..

First grab the required components (see power supply component list) and make the following circuit by soldering components together.

See image.1 for circuit connections above.

After soldering make sure all the components were soldered correctly.

You can double check by using Multimeter.

After this the power supply segment is completed.

Now head over to the remote controller segment.

Step 3: Making ​Remote Controller.

This segment is the most time consuming part of the project because you've to connect & solder dozens of wires in a narrow space.

Soldering iron can damage another wire near or your hand.

So be careful.

It's your choice to assemble the switches on the remote first and then solder them.

Or

Solder the basic wires first on the switches and then assemble them on the remote.

The second one is the safest method.

Here're the 3 different circuits of switches that you've to solder.

DPDT Switch for basic robot control. (Image.1)

Joystick switch (Image.2)

Water pump switch in (Image.3)

Now the Remote Controller Circuit Designing part is completed.

Step 4: Direction Finder Mechanism

The direction finder mechanism helps you to find and lock the direction in which the water should spread.

You can use your methods to form this mechanism but I took a reference that I found in a star wars BB-droid making video.

You can take further references of making this mechanism from above video.

I used simple wooden sticks for making the servo motor's base. (These sticks probably used in art & crafts)

Use hot glue gun for attaching servos to the sticks.

You can also use regular favicol type stuffs. Just make sure the servos are glued properly and moving as per your need.

After that, you've to attach the 'servo motors' on something upper surface for better working. I've used a basic metal strip for this.(see basic robot Image above)

Now this segment is completed.

Step 5: Water Spreading System

This part is pretty simple.

Just grab the submersible pump you have and attach it on the robot chassis with the help of a nail.

Take a regular plastic water bottle as per your need and glue it behind the pump.

I took the pipe used in the hospitals to inject the drip.

Just attach one end of the pipe on pump and other end on the direction finder mechanism.

Now take another regular pipe and attach one end on the pump and the other end of pipe in a bottle. (see image above)

Make sure the cap of the bottle should be opened because air pressure helps the water to move in the pipe easily.

After connecting everything, Now robot is ready for final connection.

Step 6: Final Connections.

Now make connections between power supply, remote controller and robot with the help of ribbon wire. (See image above)

If you've connected everything correctly then head over to the final testing.

Test power supply circuit, remote controller switches and all motors & pump. Are they working properly?

If Yes, then Pat on your back:)

Your Fire Fighting robot is ready!

If not, then check twice the connections you've made. If you made the connections correctly then the robot should work properly.

If you still face any problem then you can comment below. I'll try my best to solve your problem.

Hope you found this guide helpful.

Cheers!

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