HEAVY DUTY ROBOT RACER WITH WIRELESS CONTROL

we all participate in robotic competitions even i did
i lost my first racing competition because of lesser power motor and in efficient driver circuit.
i worked on it a lot and finally found some solutions.

solution1:  use metal geared motor instead of plastic gear (i lost my match because of plastic motors)
                  and wheel of maximum possible grip.

solution 2:  use proper motor driving technique.

solution3:  make strong chases with light weight with maximum possible ground clearance.

solution4:  use proper battery with less size and more power that works for longer period.

solution5:  better to be wireless

i made a prototype of my own racer.this racer can reach 15Km/h
it can carry up to 4kg of load
actually i made it for carrying a robot arm, gun platform and a video camera

Using this platform i made a robot gun tank.

Now a day’s security plays crucial role in any country. So many soldiers are sacrificing their lives for the sake of the country. But the technology is changing day by day. A new area began in the field of science. That is ROBOTICS. Several researches were under taken in the field of robotics. Robots are being used in different fields where there is a difficulty to the humans. Robots can be used even in the field of defense. If we lose a robot we can replace it with another one but we cannot replace a soldier with another.

Many countries started using robots in the wars. For example USA recently developed a robot called SWARD which can carry a rifle and fire at the destined targets. We tried to make a robot that will be faster enough to serve the soldiers in the battle field.

We implemented this project using two micro controllers 8051 at the transmitter and ATmega16L at the receiver. The robot platform is based on the high performance Jonson-H motors. This robot can be operated through remote through RF communication by using encoder and decoder at the transmitter and receiver with 8bit secured address. This kind of robots helps the soldiers by making some modifications in the robot we can make it to carry the goods at the battle fields to help the soldiers.

for base motors high power metal  gear motors are used

Motor ratings:

1000RPM 12V DC geared motors for robotics applications. It gives a massive torque of 12Kgcm. The motor comes with metal gearbox and off-centered shaft. Shaft has a metal bushing for wear Resistance.

Features

• 1000RPM 12V DC motors with Metal Gearbox
• 18000 RPM base motor
• 6mm shaft diameter
• Gearbox diameter 37 mm.
• Motor Diameter 28.5 mm
• Length 63 mm without shaft
• Shaft length 15mm
• 300gm weight
• 12kgcm torque
• No-load current = 800 mA(Max),
•  Load current = upto 9.5 A(Max)

a special motor driver circuit is designed using relays for driving motors at high currents

 

when there is no current flowing in the coil the switch will be as shown in the figure.that means in normal state there will be connection between "common" and "contact". when ever current is flowing in the coil the core is magnetized and attracts the switch.so the switch will be moved towards "non contact". so a connection will be established between "NC" and "CM".

 for driving a motor we need two relays
the circuit for connecting relays will be as follows.
the following circuit is a high current motor driver using relays.

actually we are implementing a H-bridge using the relays. when ever a logic "1" is applied to the transistor base then the corresponding relay will be activated .it will be very simple mechanism. if you are using more than one motor i prefer you to use a ULN2003 IC for driving relays.one ULN2003 can drive "7" relays.
so that you can control "3" motors with still one left.if you use two ICs you can control "7" motors.
these relays can drive very large currents compared to L293D and L298   

i made a perfect robot that will help you in racing..... take a look at it

for wireless circuit refer the 434 MHz RF modules circuit