How to Build a Robot or Remote Control Robot

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Remote Control Robot

Many people consider robots machines that operate autonomously. However, if you broaden the definition of the term “robot,” any remotely controlled object can be considered one. You may find it difficult to build a remote control robot, but in reality, it is simple as long as you know how. This article will explain how to build a remote control robot.

Steps of Build a Remote Control Robot

1. Recognize what you will build

The first step in building a remote control robot is to recognize that you will not be able to build a large, humanoid, two-legged robot, able to perform all the tasks. Nor will you build a robot with multiple claws, capable of lifting 50 kg objects. You will have to, at first, build a robot that is capable of moving forward, backwards, left and right, controlled by you and without wires. However, once you have learned the basics and built this simple robot, you can add and modify things in it. You should, in general, assume that a robot is never complete and can always be modified and improved.

2. Plan Your Robot.

Before you build your robot, before you even order parts, you will need to design it. For your first robot, you must adopt a simple design with only two servomotors and a flat piece of plastic. This is a really simple design, which leaves room to add extra things after construction. Plan to build something 15 x 20 cm. For such a simple robot, you may be able to simply draw it on a paper with the aid of a ruler. Since it will be a small robot, draw it the same size it will have in real life. When you work on bigger, more complex robots you should start learning how to use CAD or some similar program like Google SketchUp.

3. Choose the pieces.

It is not yet time to order parts. But you must choose them now and take notice of where to buy them. Try to order from as few sites as possible to save money on shipping. You will need material for the chassis, two servo motors, batteries, a transmitter, and a receiver.

  • Choosing a Servomotor: To move the robot you need to use engines. Each wheel will be powered by a motor. This way you can use the simplest manoeuvring system, the differential steering. This means that to go forward both engines must rotate forward; To go back both engines must turn back; And to turn to the sides one motor turns and the other one is stopped. A servomotor is different from a basic DC motor because it is composed of gears, can only rotate by 180 degrees and can transmit data back to its position. This project will use servo motors for being easier and not forcing you to buy an expensive “speed controller” or a separate gearbox. Once you understand how to build a remote control robot, May want to build another one (or modify the first) using DC motors instead of servo motors. There are four basic precautions you should take when buying servo motors: speed, torque, size/weight and whether they are modifiable to 360 degrees. As servo motors only saw up to 180 degrees, their robot would only be able to move a little forward. If the motor is modifiable to 360 degrees, you can change it to rotate continuously. So make sure that the motor is actually modifiable to 360 degrees. Size and weight are not as important in this design as you will have plenty of room to spare anyway. Try to get something of medium size. Torque is the force of the engines. That’s what gears are used for. If there are no gears and the torque is low, the robot will probably not be able to move forward, Because it will lack strength. You will want high torque. However, generally the higher the torque the slower the speed. For this, try to balance torque and speed. You can always buy and attach more powerful servo motors after completing construction. It is recommended to get the Hitec HS-311 servo motor for the first RC robot. This one has a great balance between speed and torque, is little expensive and has a good size for the robot. The Hitec HS-311. This one has a great balance between speed and torque, is little expensive and has a good size for the robot. The Hitec HS-311. This one has a great balance between speed and torque, is little expensive and has a good size for the robot. The Hitec HS-311.
  • Since the servo motor can rotate only 180 degrees, you must modify it to get continuous rotation. Modifying a servo motor will violate the warranty, but it must be done. For detailed instructions on modifying a servo motor, go here.

Choose Batteries: You will need something to power the energy of your robot. Do not try to use an AC adapter (plugged into a wall outlet). You should use DC batteries, ie batteries.

Choose the type of Batteries: There are four main types of batteries to choose from. They are Lithium Polymer (LiPo), NiMH, NiCad and Alkaline.

  • Lithium Polymer Batteries are the most modern type you can use, in addition to extremely light. However, they are dangerous, expensive and require a special charger. Only use this type of stack if you have experience with robots and are willing to spend more.
  • NiCad batteries are common and rechargeable. They are used on many robots. The biggest problem with these batteries is that if you recharge them before they are completely discharged, they will last less.
  • NiMH batteries are very similar to NiCad batteries in size, weight and price, but have better performance. They are the most recommended batteries for a beginner project.
  • Alkaline batteries are common and non-rechargeable. They are easy to find (you probably own some) and cheap. However, you will need to buy new batteries at all times as they run out quickly. Do not use.

Choose Battery Specifications: You will need to choose the voltage of your batteries. The most common in robots are 4.8V and 6.0V. Most servo motors will operate well at these voltages. It is generally recommended to use 6.0V (if your servo motors support, which usually occurs) as it will allow the motors to operate faster and have more force. Now you will need to deal with the stack capacity of your robot, labelled as MaH. The higher the batteries, the better. Although they are more expensive and heavier. For the size of the robot you are building, it is recommended to use 1800 MaH. If you have to choose between 1450 MaH or 2000 MaH batteries of the same voltage and weight, go from 2000 MaH. They will be more expensive, but more versatile. Also, buy a charger for the batteries.

Choose a Material for your Robot: A robot needs chassis to house all the electronic components. Most robots of this size are made of plastic or aluminium. For a beginner, it is advisable to use a type of plastic called HDPE, for being easy to handle and cheap. Choose a thickness of 1/4 “.To choose the width of the blade, you should opt for a large one, in case the blade is missing, it is advisable to obtain a blade that is at least twice the size of your robot. , An even larger size may be required.A piece of 24 “X24” HDPE

Choose a Transmitter / Receiver: This will be the most expensive part of the robot. It can also be considered the most important because, without it, the robot can not do anything. It is highly recommended to buy a good transmitter/receiver, as it will be a great differential. A cheap transmitter/receiver will move your robot well, but will not allow the addition of new features. What’s more, the transmitter can be used for other robots that you build in the future. So instead of buying a cheap one now and a more expensive one then simply buy the best one at a time. You will save money in the long run. Either way, there are some frequencies that can be used. The most common are 27Mhz, 72Mhz, 75Mhz, and 2.4Ghz. 27Mhz can be used for aircraft and cars. It is most commonly used in cheap remote control toys. 27Mhz is only recommended for small projects. 72Mhz “only” can be used for aircraft. Because 72Mhz is a frequency used in large aircraft models, it is illegal to use it on land vehicles. If you use 72Mhz you will not only be breaking the law but you are risking causing interference to other large and expensive models of aircraft in the vicinity. Such aircraft may fall and cause a very large damage on repairs. Or worse, they can fall on people, injure them or even kill them. 75Mhz is made for surface-only use, which may be the frequency to use. However, 2.4 GHz is better as it has less interference than any other frequency. It is highly recommended to spend the extra money needed to purchase a 2.4Ghz transceiver. After deciding the frequency to be used, you must decide how many channels will be used. Channels are basically how many things will be controllable in your robot. For this, you will need at least two channels: one to allow the robot to move back and forth and another to move it to the left and right. However, it is recommended to use at least three channels. That’s because, after building the robot, you may want to add something. If you use four channels, you usually have two levers. With a four channel transmitter/receiver, you may still be able to add a claw eventually. As previously stated, you should get the best transmitter/receiver that your budget allows, so you do not have to buy a better one later. You can use your transmitter and even your receiver again on other robots you build. The Spektrum DX5e 2.4Ghz radio with 5 channels and the AR500

Choose the Wheels: When choosing the wheels, the three most important things to worry about are the diameter, the traction and the ease of attaching them to your engine. The diameter is the measured length of one side of the wheel, passing through the centre point and ending at the other side. The larger the wheel diameter, the faster it will rotate and the easier it will scale surfaces, though it will have less torque. If you have a smaller wheel, it may not scale surfaces easily, nor run very fast, but it will have more power. The traction is how well the wheels adhere to the surface. Be sure to purchase wheels wrapped in rubber or foam so they do not get slippery. Most wheels made to be connected to servomotors can now be bolted directly, so do not worry. It is advisable to purchase a wheel with 3 to 5 inches in diameter, wrapped in rubber. It will take 2 wheels.

4. Now that you’ve chosen the pieces, go ahead and order them online

 Try to order them from as few sites as possible. Buying everything at once you can find money with freight

5. Measure and Cut Your Chassis.

Take a ruler and a marker, measure and mark the width and length of the chassis in the material you are using. A size of 15 by 20 cm is recommended. Measure again and make sure the lines you’ve marked are not crooked or too long. Remember: Measure twice, cut once. Now cut. If you are using HDPE, you should be able to cut the piece the same way you would cut a piece of wood the same size.

6. Ride the Robot.

Now that you have all the material and your chassis is cut, just mount everything. This can be the easiest step if you’ve designed your robot well.

  • Mount the servo motors on the bottom of the plastic part near the front. They should be on the sides so that the shaft (the part of the motor that moves) is to the side. Leave enough space to mount the wheels.
  • Connect the wheels to the servo motors using the bolts that came with them.
  • Glue one piece of Velcro onto the receiver and another on the batteries.
  • Put two pieces of the opposing Velcro in the robot and stick it on your receiver and the batteries.
  • You should now have a robot with two wheels in the front and slopes in the back. There will not be a “third wheel” in this robot. Instead, the back will simply slide on the floor.

7. Connect the Wires.

Now that your robot is assembled, it’s time to plug everything into the receiver. Insert the batteries into the receiver where “battery” is written. Make sure you put them in the correct direction. Now plug the servo motors into the first two channels of the receiver, where “channel 1” and “channel 2” are written.

8. Charge the Batteries.

 Remove the batteries from the receiver and place them in the charger. Wait until they are filled full. This can take up to 24 hours, so be patient.

9. Play with it.

You must be finished now. Go ahead, move your transmitter. Ride a course with obstacles to your robot, or play with your cat. Once you get tired of playing with your robot, start adding things to it!

Some Extra Tips of Build a Remote Control Robot

  • You may prefer to use a 12V DC bicyclist battery for high speed and torque.
  • If you press left and your robot moves to the right, try toggle the connectors of the servo motors plugged into the receiver. That is if you have plugged the right servo motor into channel 1 and the left one into channel 2, move them in place, placing the right on channel 2 and the left one on channel 1.
  • Try putting your old smartphone in the robot and use it as a video transmitter if it has a camera. You can use it in conjunction with Google’s communications applications as a link between the robot and your computer or another device. That way you can pilot it out of the room!
  • You may need to charge an adapter to fit the batteries into the charger.
  • Add things. If you have an extra channel on your transmitter/receiver, you can add another servo motor to do something else. With an extra channel, try to make a claw that can close. With two extra channels, try to make a claw that opens and closes and moves to the left and right. Use the imagination.
  • Make sure that the transmitter and receiver you purchased are the same frequency. Also, make sure the receiver has the same number of channels as the transmitter. Only the fewest channels will be usable.

Warnings for Build a Remote Control Robot

  • Using a 12V DC battery can burn the motor if it was not 12V DC.
  • Do not use the 72mhz frequency unless you are building an aircraft. If you use it on a land vehicle, you are not only committing an unlawful act as you are risking injuring or killing someone.
  • Beginners should not use AC power (plugged in) in any home design. AC power is extremely dangerous.
  • Using a 12V DC battery in an 110-240VAC motor causes it to generate smoke and stop working in a short time.

Necessary materials Remote Control Robot

  • Material for your Chassis: HDPE in the size you need, with clearances.
  • Two Hitec HS-311 Servomotors.
  • A Receiver: The transmitter receiver that is placed in the robot.
  • Batteries: one pair of 6.0V 2000mA NiMH batteries
  • A Battery Charger.
  • 2 Wheels: Precision Wheels, measuring 5 inches in diameter.
  • Velcro.

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