Making your first bOt

In this tutorial you will make your first robot. Believe me making a robot is an easy task and you will enjoy it! Let’s make a very simple mechanical bOt (robot) to give you an insight into basics of building a bOt. As your first experience of bOt, let’s make a bOt that will only run by a remote and can be used in racing competitions. So lets start right away!

Things required for making your first bOt -

Body or Chassis: - for making a base for your bOt you have plenty of options like wood, Ply-board, switch board, aluminum, acrylic sheet, FRP, etc.

Mechanical Base

Things to keep in mind before choosing a material -

  • Strength of material - will it be able to sustain the weight of your components
  • Weight of material
  • Availability in the market

Here we will be using an easily available electrical switch board for making base of the bOt.

Wheels: Now once you have selected the base, bOt should be able to move. For this you need wheels. We are going to use three wheels, two (driving) wheels which can be easily coupled with the motors and one castor wheel

Wheel

(that will be self-driven) like office-chair wheels.

Motors: You will need two geared dc motors which can operate on 6-12V or even at 24V. Ensure that both the motors must have same revolution per minute (rpm).

Motor

The motor should have rpm ranging from 100 to 300 (for a controlled motion).

 

Motor1 (left)

Motor2(right)

For moving forward

Clockwise

Clockwise

For moving backward

Anticlockwise

Anticlockwise

For turning left

Off

Clockwise

For turning right

Clockwise

Off

This is called a differential drive. You can also pivot the bot to rotate about the centre by moving the motors in opposite direction.

(Assuming that the driven wheels are on front side & castor is on rear side)

Here we are using two 12V dc motors of 200 rpm and 5kgf torque.

Power: A battery or battery eliminator (that converts AC supply to DC supply) is needed for driving motors.

Battery

The voltage and current ratings of the DC motors should be considered before selecting a particular power source. Here we are using a 9V dc battery which is easily available.

Remote Controller: You need a remote to control your bot; you can have control on each motor separately. If you have a toy car that have a wireless remote you can take out the wireless module & place it on your bot. If you don’t have one you can make a wired/wireless remote at home.

Steps to make your first bot:

  • PAPER PLANNING: Before you start making your bOt you need a paper plan. Measure length of the motor (excluding shaft), diameter of shaft of the motor, inner hole diameter of the motor. Draw a rough sketch of the base you need to cut keeping in mind the placement of motors and wheels. Now mark the position of holes you need to drill for clamping motors using nuts and bolts. This will help you to use your time judiciously.Paper Plan
  • CUTTING BASE: Cut the base with a hack saw, and drilling holes for clamping the motor. {if you don’t have proper tools to cut and drill then you can also go to carpenter that will cost you between Rs 50-100}
  • CLAMP MOTORS: Screw the clamp {if you are unable to find a clamp then you can make one at home, a tutorial is coming soon for that}
  • MOUNT WHEELS: If you get the same size of motor shaft and hole of wheel you are lucky, and if you are not able to couple them read the following tutorial - Coupling motors and wheels.Mount wheel
  • To fix the castor wheel, screw it to the base. (If the height is insufficient then use a wooden piece and nail it to base.)Castor
  • MAKING a REMOTE: If you are lucky to find a toy car near you, then your first bOt is ready (if not then a tutorial on how to make a remote is coming soon).

And here it goes……………………………….woohoo!!

Some necessary items you should buy for making your first robot

  • Tools:
    • Soldering iron+ flux+ wire
    • Hack saw/ blade
    • Screw drivers
    • Multimeter
    • Pliers
    • Wire stripper
    • Spanner
    • Hammer
    • Driller (little bit expensive, if you don’t wish to buy you can always go to carpenter)
  • Chassis:
    • Base material
    • Wheels + Castors
    • Motors dc geared (as per your need)
    •  Wired remote:
    • Three way switches (spring loaded)
    • Ribbon  wire
    • PCB board
    • Battery/ Battery eliminator (dc)
  • Miscellaneous:
    • Double tape
    • M seal
    • Nails, Screws n nuts
    • Clamps
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Comments

Member since:
18 February 2009
Last activity:
1 year 8 weeks

Hi Shekhar,

Power source has been explained above. You can use either a battery or an eliminator as a power source. For making your own wireless remote controlled bOt check this tutorial - Building an RF Remote Control.  

Founder and Admin

Member since:
19 March 2010
Last activity:
7 years 3 days

I AM CONFUSED ON THE POWER SOURCE AND REMOTE CONNECTIONSS ,PLZ SUGGEST ME A TUTORIAL SOON,I WANT TO KNOW ABT THEM SOON.............

Member since:
26 February 2010
Last activity:
7 years 2 weeks

I did not know that robotics could be this simple.

 

Where can i purchase the remote TX and Rx modules ?

Amazing website. hard to believe it took me so long to discover it..

Member since:
21 February 2009
Last activity:
7 years 1 week

Read our tutorial on Building a RF remote control

bro pls send post how to make a remote

Member since:
21 February 2009
Last activity:
7 years 1 week

If you select a wooden base of thickness 5mm to 10mm it will be able to sustain a load of 1-2kg or even more. This will serve the purpose for competition specific bots.

Regarding motors you can definately choose a motor of lower rpm (revolution per minute) but the motor should have high torque and the wheels should be bigger in size. For more details check out this tutorial - Calculation of Torque and RPM.

Yes you can also use 'solar cells' as a power source for driving a bOt but then the bOt should be very light weight as solar cells do not provide high power.

 

Note: This post has been moved to forum also. 

Member since:
10 March 2009
Last activity:
8 years 2 weeks

how much rigidity will the bases have.Can there be moters with smaller speeds.What about using a solar energy for this?