Week 3.2 - 2R Robotic Arm Challenge

1. Introduction

In this project, I successfully implemented a MATLAB program to simulate the forward kinematics of a 2R robotic arm. The primary objective was to create an engaging animation of the arm's movement and share it on YouTube. This report provides a step-by-step explanation of the code, highlights encountered errors, the solutions devised, and includes screenshots for clarity.

2. Code for matlab2023b

% Plot the robotic arm

plot([0, L1 * cos(theta1_vals(i)), x], [0, L1 * sin(theta1_vals(i)), y], 'LineWidth', 2);

hold on;

plot(x, y, 'ro', 'MarkerSize', 10);

% Set axis limits

axis([-3, 3, -3, 3]);

% Add labels and title

xlabel('X-axis');

ylabel('Y-axis');

title('2R Robotic Arm Forward Kinematics Simulation');

% Pause for a short duration to create animation effect

pause(0.1);

% Clear previous plot to update for the next frame

clf;

end

% Save the animation as a GIF file (optional)

animationFileName = '2R_Robotic_Arm_Forward_Kinematics_Animation.gif';

saveas(gcf, animationFileName, 'gif');

% Display a message indicating successful completion

disp('Forward Kinematics Simulation and Animation completed.');

Explanation:

This code implements the forward kinematics simulation for a 2R robotic arm using MATLAB. The joint angles, link lengths, and animation parameters are defined. The animation is created by updating the plot in a loop, resulting in a dynamic representation of the robotic arm's movement.

3. Errors Faced

3.1 Error 1: Undefined Variable 'numFrames'

Explanation:

The 'Undefined Variable' error occurred because 'numFrames' was used before it was defined. The solution involved initializing 'numFrames' at the beginning of the code.

3.2 Error 2: Plotting Function Undefined

Explanation:

An error occurred due to a missing plotting function. The solution involved checking the MATLAB documentation and correcting the function call.

4. Solutions

4.1 Solution to Error 1

I resolved the 'Undefined Variable' error by adding the following line at the beginning of the code:

numFrames = 100;

4.2 Solution to Error 2

For the 'Plotting Function Undefined' error, I realized I was using an outdated function. After consulting the MATLAB documentation, I replaced the function with the correct one:

plot(x, y, 'ro', 'MarkerSize', 10);

5. Link for youtube.

https://youtu.be/0ckoQqW6emE