We loved this video from Sparkfun about encoders and wanted to share it with you along with some highlights!
Precision and accuracy are paramount in robotics. One of the fundamental challenges faced by roboticists is determining how far a robot has traveled. Whether it’s a small wheeled bot navigating a classroom or a sophisticated rover exploring distant planets, accurately measuring distance is crucial for navigation and task execution. The video below delves into the intricacies of encoders, the essential components that help robots measure their movement with remarkable precision.
Encoders, particularly rotary encoders, play a vital role in modern robotics by providing accurate feedback on wheel rotations and motor movements. We loved the introductory overview of different types of encoders, including optical, magnetic, and gear-based variants in the video. By understanding how encoders work and how to implement them in your projects, you’ll be equipped with the knowledge to enhance the functionality and reliability of your robotic creations.
if you want to push the boundaries of your robotics projects, learning about encoders is indispensable! We think this video is a great way to get started with the theory behind encoders and practical ideas for setting up and programming encoders for your robots. From ensuring straight-line movement to integrating advanced quadrature encoders for direction detection, these insights will empower you to tackle complex robotic challenges and achieve greater control and accuracy in your designs.
Review the concepts from the video below:
What are Encoders
0:19-1:06
– Explanation of rotary encoders and how they count wheel rotations.
– Description of various types of encoders: optical, gear teeth, and magnetic (Hall effect sensors).
– Common uses for encoders, including user interfaces like mouse scroll wheels.
Using Encoders
1:07-7:19
– Challenges of measuring distance with DC motors without encoders, such as varying speeds due to voltage changes and battery drain.
– Detailed setup of a magnetic encoder on a robot (“Fred”) with instructions on wiring and coding for Arduino to count encoder ticks.
– Calculating distance traveled by the robot using encoder ticks and wheel circumference.
– Explanation of how to ensure the robot moves straight by using encoders on both wheels and adjusting motor speeds to balance movement.
Quadrature Encoders
7:20-10:34
– Addressing the problem of determining the direction of rotation.
– Introduction to quadrature encoders which use two sensors to determine the direction of rotation.
– Detailed example of how quadrature encoders work and how to implement them.
Absolute Encoders
10:35-11:22
– Brief introduction to absolute encoders, which measure the exact position of a shaft.
– Mention of their uses, such as determining the position of a robot arm or the direction of wind with a weather vane.
Conclusion
11:23-End
– Encouragement to explore and build projects using encoders, with a nod to their potential use in advanced robotics and autonomous vehicles.
