FILL THE BUNKERS: A Test of Speed
ROBO COMBAT: A Show of Power
FOR MORE DETAILS VISIT THE TRYST WEBSITE….!!
what you need to know . . .
The first robot is always the hardest.
So we will take the KISS approach:
Keep It Simple, Stupid!
your first robot will have 2 wheels
driven under the most basic algorithm – Differential Drive.
• to drive straight both wheels move
forward at same speed
• to drive reverse both wheels move
back at same speed
• to turn left the left wheel moves in
reverse and the right wheel moves
• to turn right the right wheel moves in
reverse and the left wheel moves
Wheels and Motors
• Big wheels will let your robot move faster. Small wheels for slower.
• But bigger wheels means your robot has less torque to carry a heavy
• Choosing motors would involve calculations of weight, gearing ratios,
desired terrain, desired velocity and acceleration, voltage, power
consumption, controllability and a whole range of things too overwhelming
for a beginner
Arey IIT JEE ke
funde lagaayo yaar!!
Types of motors to use
• DC geared motors
• Drive trains
Motor on which a gear
box is mounted.
Set of gears arranged in a pattern
Voltage: 6V - 24V
Torque: double what you think you will need
Specific components you may need
– Voltage Regulator
– L293D - Motor driver + H bridge
• Drive a pair of DC
• Motor supply voltage can go
up to 24Volts
• Maximum of only 600mA
• Enough to drive small DC
Remember to add 0.22uF capacitors across both the motors to reduce the effect
of noise on the circuitry
What about higher current requirement ?
• Use ULN2003 – current amplifier
• …and relays for switching
(as explained earlier)
Use protection diode for relays
Wired / Wireless Remote control
• Wireless remote control complexes the circuitry
• But you can get rid of that long wired tail dangling out of your remote control robot
• Easiest solution would be to hack those cheap wireless toy cars, take their
electronic guts out and use them in your robot
• For more flexibility, you can build a custom remote control system
Use RF Tx/Rx modules
and encoder/decoder ICs
Tools and some other components
Solder sucker Soldering iron
Wire Stripper Pliers Variable resistors Switches
Always follow the principle
‘ DESIGN,THEN BUILD ’
planning things is generally always a good idea
“for every hour spent on design is one less hour spent on construction”
(and usually low quality construction at that!)
• Make sure that the machine is properly balanced.
• Bring the machine’s CG as low as possible.
• Achieve this by bringing the motors as close as possible to the ground.
• Make the weight of the front and rear of the machine nearly equal to prevent
• Check your motors for enough torque.
• Try to reduce total machine’s weight by using lighter materials and as less
material as possible.
• basic structure to which you attach everything else.
• probably the largest part of your robot.
• make sure it is made of a light weight rigid material such as aluminum.
• Reasonably cheap
• Easy to work on
• Strong enough
• Wheel diameter ( discussed earlier )
• Wheel texture : smooth wheel will not have much friction
skid while accelerating and braking
really rough wheel, has higher friction with the ground
consider wear and tear
• Wheel width : increased resistance to rotating the wheel on a surface
• Wheel centre hole diameter : depends on length and diameter of your motor
Gripper design – mechanisms
• Material used : Aluminum
• Use 2 motors, one each
for the hands of gripper.
• Use single motor mounted
on one hand and other
coupled to it using gears.
• gripper should be light
weight : use light weight
• use foam or rubber to
• Design the grip acc. to the
For picking up the ball
use cup shaped grip.
Tools and some other components
Places to acquire materials
Lajpat Rai Shop no. 629
Motors, Solenoids, Light sensors, Encoder disks
Lajpat Rai Shop No. 614
ICs,SMD components,LCD,Wireless Radio modules,
Connecters computer type,
Shop No. 463 Lajpat Rai
1675 Bhagirath Palace
Relays + connecters, switches,push buttons
Shop no. 3602 , Ph. 23912860
‘difficult to describe but you will know one if you see one’
To catch up the demonstration of some of our BOTS,
you all are welcomed to assemble in Robotics room,
SAC at 8 pm, today…