Arduino IoT Robotic Arm

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Introduction: Arduino IoT Robotic Arm

Hello there! This is my first robotic arm with the following features (until now):

I am very happy with the result. Therefore, I would like to share with you my experience and how to build it. So, let's start...

Step 1: Components & Materials

To build the robot you need:

  • 1 x Arduino Yun (or any Arduino board)
  • 5 x servo motors
  • 1 x 5V charger, min 2.5 A
  • 2 x Led's
  • 2 x resistors, 100 ohm (for red led) and 150 ohm (for blue led), respectively
  • 2 x wood mixing sticks
  • 1 x metallic wire (or similar)
  • 1 x plastic sheet (I took it from a shower gel bottle)
  • 1 x rubber band
  • 2 x small sponges (see left-upper corner)
  • 9 x plastic M3 screws
  • 6 x plastic M2.5 screws
  • 1 x wood plate 3mm (30cm x 50cm should be more than sufficient)
  • 1 x wood glue
  • time for coding

Step 2: Building the Robot

For building the robot, start by measuring the servos size and checking the servos torque. This will give you an indication about the size of the arms and eventually the size of the robot. In my case, I ordered 2 different micro high-torque servos: first pair and second pair. These can travel up to 140 deg even though they are specified to travel 120 deg. However, I advise to buy 180 deg servos in order to have more travel angle.

For the gripper, there is no need for a high-torque servo. The cheapest micro-servo on ebay can do the job.

Start by cutting the arms as you see in Photo 1. Here, you can be creative, there is no fixed design, you can come up with your own design. Then, build the gripper using one mixing stick cut in half and the plastic sheet as spring return. With wires connected to inner side you can close and open the gripper. For my robot, I used one M3 screw to make the gripper pivot. The gripper pivoting is done by a servo located to the other side of the arm in order to obtain weight balance. The power is transmitted via another mixing stick (see Photo 2, top of the robot).

Next, build the base and the plate that holds the base servo and the Arduino Yun board (or another board). Put everything together and you should have something like in Photo 2.

If you want a better looking design, sand the wood components and paint them (as in Photo 3) with your preferred color. For my robot, I went for a silver color (to mimic metal) with red stripes.

And yes.. we have a robot :) see Photo 4.

Step 3: Writing the Code

Ok, so we finished making the hardware! However, the robot has no life without software.

For the software, I started by making first an interface in Blynk. If you haven't used Blynk before, please check their website on how to do it. Should be very easy and straight-forward.

Note: If you don't have a board that can connect to the internet, don't worry you can still use Blynk with a normal board e.g., Arduino Uno, via the USB port. To do this read here.

Next, let's go to Arduino IDE and write some code. For your convenience, I attached the code, so you can just use it :) To run it you need to do the following:

  1. Configure the Arduino Yun board.
  2. Install Blynk library in your Arduino IDE by going to Sketch>Include Library>Manage Libraries , search for Blynk and install it.
  3. Add the SimpleTimer library in a folder with the name SimpleTimer to your Arduino library folder, usually Arduino\libraries\
  4. Add the MotionGenerator library that I wrote, in a folder with the name MotionGenerator to Arduino library folder
  5. Compile and upload RobotArm_instructables.ino (Note: don't forget to update your Blynk token)

Note: The MotionGenerator library is an analytical-based solution that will give you smooth nice transitions from one point to another. It allows limitations on the maximum speed and acceleration.

_____________________________________________

Optional steps (forward kinematics, see Photo 2): For this you need Matlab and Robotics Toolbox. If you have all these set, make sure your robot is connected to Blynk and connected to your computer's USB port. Matlab will collect information from the Arduino via the serial communication. So, make sure to fill in the right COM port in the MainScrip.m. Finally, just run the MainScrip.m.

Note: The robot kinematics are for my own robot. For your robot the dimensions might be different (feel free to adjust in robotKinematicsFcn.m).

Step 4: Testing and Having Fun

Great! You completed the Robot Arm. Now is time to play and enjoy!

In the future, I will implement inverse kinematics and perform tasks like drawing, precise gripper positioning, trajectory following and many more. So, stay tuned!

IoT Builders Contest

Participated in the
IoT Builders Contest

Arduino Contest 2016

Participated in the
Arduino Contest 2016

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    29 Discussions

    0
    fauzilinit
    fauzilinit

    3 months ago

    i use arduino uno, what should i change about the script ?

    0
    gadenikjr127
    gadenikjr127

    9 months ago

    Please can u share how to implement forward kinematics of arm with matlab

    0
    sagukori11
    sagukori11

    11 months ago

    is the robot diagram available?please help me

    0
    Nuggs100
    Nuggs100

    12 months ago

    Hi there could I please get the dimensions of the wood and the wiring diagram?

    0
    EldhoS4
    EldhoS4

    Question 1 year ago

    How did you get the gripper?

    4
    anhhaotran77
    anhhaotran77

    1 year ago

    Great project.
    Please give me the wiring diagram and the steps to assemble the robot arm. thank you

    0
    EnriqueN16
    EnriqueN16

    1 year ago

    it looks amazing, but is not the version a bit more simplified where many programs are not covered?...even if you have a little swing arm....please.

    0
    PritiL1
    PritiL1

    1 year ago

    Nice project.
    Can I get the circuit diagram and building of robotic arm. ?

    0
    Péters628
    Péters628

    Question 1 year ago

    Does it also work with arduino nano 3.0?
    Your machine is brilliant! ;)

    0
    VijayR91
    VijayR91

    Reply 1 year ago

    Did you get it?

    0
    MAhH2
    MAhH2

    1 year ago on Step 1

    What is the robot diagram available?please help me

    0
    VijayR91
    VijayR91

    Reply 1 year ago

    Did you get it?

    0
    eminenoa
    eminenoa

    3 years ago

    thanks much. but ı have a question.

    can we make this robot arm using 3D printer?

    like this photo

    the-eezybotarm-cool-3d-printed-robotic-arm-to-learn-the-basics-of-robotics-1.jpg
    0
    priyankb1
    priyankb1

    Reply 2 years ago

    hey,,,i want this all part...how can i buy this or how can i made this all?

    0
    aerdronix
    aerdronix

    Reply 2 years ago

    By the way, nice robot arm ;)

    0
    aerdronix
    aerdronix

    Reply 2 years ago

    Hi eminenoa,
    Sorry for my late reply. With a 3D printer there is room for more design freedom. So, indeed is it possible to print the robot that I made using a 3D printer. However, I do not own a 3D printer. So, I did not create drawings. Regards.