Before entering into complexity, I decided to make a bot which can be controlled from a distance using remote. This wired bot can move in forward as well as backward directions, can turn and also rotate about itself. The purpose was to study the electrical connections required to control a bot.The building materials used were:
1. 2 DC motors. (Motors working on DC supply which can rotate in both directions.)
2. 4 two-way-switches
3. 2 wheels.
4. 9V battery.
4. 9V battery.
5. Other raw material to build the body. (I used the 'Nokia' box).
Here's the bot I've made.
Steps followed:
1. Making the body was the simple task. I just installed DC motors in the 'NOKIA' box and then connected wheels to them.
2. To make the remote, I used a plastic box which can accommodate 4 two-way switches and fixed them as shown. Left 2 switches are used to control left motor and right 2 switches are used to control right motor.
3. The reason behind using two-way switches follows a story. First of all, I tried making a remote using 4 one-way switches and a battery. However, it was found that this idea required more than 1 battery to control the bot hence was neglected. After this, I thought of a circuit which uses 2 four-way switches, one for controlling each motor. This time the problem was to find four-way switches in the market. But then using 4 two-switches I successfully managed to convert them into 2 four-way switches and my problem got solved. It took me around 2 months to tackle this riddle.
If two blue squares are closed, +ve of the motor connects to +ve of battery and -ve of the motor connects to -ve of battery. Therefore, the motor revolves in forward direction.
If two red squares are closed, +ve of the motor connects to -ve of battery and -ve of the motor connects to +ve of battery. Therefore, the motor revolves in backward direction.
4. I then attached the third supporting wheel to the body and my bot was complete.
5. The thing which I learned was the circuit. I can now use the same remote for controlling movements of any wired bot.
Note: The type of this bot is Differnetial-type drive. There are two more types viz. Car-type and sychronized-type.
Two-way switches and converting them to four-way switches:
In the left diagram, the bulb glows in both situations by the use of a two-way switch. Right diagram shows how 2 two-way switches can be combined to form a four-way switch.Drawbacks I observed:
1. Since both motors are operated independent of each other, one motor may rotate at a faster speed than the other. Due to which, the bot may move along a curve even when we want him to move in a straight line.
2. To turn the bot, either we can switch off the right motor so that it turns right. Or we can switch off the left motor so that it turns left. The point is, while turning the bot rotates about a vertical axis passing through the switched-off motor. As a result, the bot is not able to turn while moving forward or backward.
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Thanks to all who helped me.
2. To turn the bot, either we can switch off the right motor so that it turns right. Or we can switch off the left motor so that it turns left. The point is, while turning the bot rotates about a vertical axis passing through the switched-off motor. As a result, the bot is not able to turn while moving forward or backward.
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Thanks to all who helped me.
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