How to Write a Simple Python Program to Control a Robotic Arm

Python is a versatile language that can be used to control just about anything, including a robotic arm. In this article, we’ll show you how to write a simple Python program to control a robotic arm.

First, let’s define what we mean by “robot arm.” A robot arm is simply a mechanical arm that can be controlled by a computer. They are often used in manufacturing and assembly tasks where they can perform repetitive motions with high accuracy.

Now that we know what we’re talking about, let’s get started!

Step 1: Choose Your Robot Arm - How to Write a Simple Python Program to Control a Robotic Arm - Lego Mindstorms EV3 kit

There are many different kinds of robot arms available on the market, so it’s important to choose one that meets your needs. For our purposes, we’ll be using the Lego Mindstorms EV3 kit. This particular kit is perfect for beginners because it’s relatively inexpensive and easy to use. Plus, it comes with everything you need to get started, including the robot arm itself, an infrared remote control, and an easy-to-use programming interface.

Step 2: Set Up Your Robot Arm

Once you have your robot arm, it’s time to set it up. The EV3 kit comes with clear instructions on how to do this, so simply follow the directions in the manual. Once your robot arm is assembled, it should look something like this:

Step 3: Install the EV3 Programming Software

Now that your robot arm is all set up, it’s time to install the programming software. The EV3 programming software is available for free from Lego. Simply go to their website and download the software for your operating system.

Once the software is installed, launch it and you should see a screen that looks something like this:

Step 4: Connect Your Robot Arm to the Computer

Now it’s time to connect your robot arm to the computer. To do this, simply plug one end of the USB cable into the robot arm and the other end into the computer. Once connected, you should see a message on the EV3 programming interface that says “EV3 is connected.”

Step 5: Write Your Python Program - How to Write a Simple Python Program to Control a Robotic Arm - Step 5 Write Your Python Program

With your robot arm all set up and connected to the computer, it’s time to write your Python program. When writing programs for the EV3, it’s important to use a specific library designed for the EV3. The ev3dev.ev3 library is a great way to interact with your LEGO Mindstorms EV3 robot. This library makes it easy to control your robot’s motors and sensors, and it also provides a nice interface for working with the buttons and LCD screen on your robot. The ev3dev-lang-python project provides this library and makes it easy to get started with programming the EV3 in Python.

To get started, simply create a new file and import the ev3dev.ev3 library:

You can do this by adding the following line to the top of your file/script:

import ev3dev.ev3 as ev3

Once you have imported the library, you can start using it to control your robot. For example, the following code will make your robotic arm move forward for 3 seconds:

ev3.LargeMotor(‘outA’).run_timed(time_sp=3000, speed_sp=500)

And the following code will make your robotic arm move back for 3 seconds:

ev3.LargeMotor(‘outA’).run_timed(time_sp=3000, speed_sp=-500)

These are just a few examples to get you started. For more information on using the ev3dev.ev3 library, check out the project’s documentation.

And that’s it! You have now written your first Python program for the LEGO Mindstorms EV3!


In conclusion, writing a Python program to control a robotic arm is a relatively simple process. The most important thing to remember is to use the correct libraries and methods for each step. If you have any questions, please don’t hesitate to Contact Us. We would be more than happy to help you get started.

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