Line Following with Mindstorms EV3: One Sensor vs. Two Sensors
There are pros and cons to using one or two sensors for your Mindstorms EV3 line following robot. Here's a breakdown to help you decide:
One Sensor:
Pros:
- Simpler Build: Requires only one sensor, which saves parts and reduces complexity.
- Easier Programming: Coding for a single sensor is generally more straightforward, especially for beginners.
Cons:
- Zig-Zag Movement: The robot tends to follow the line in a zig-zag pattern, constantly adjusting to stay centered.
- Less Stable: Prone to losing the line on curves or uneven surfaces due to overcorrection.
- Calibration Needed: Requires some calibration to find the ideal light value threshold for the line.
Two Sensors:
Pros:
- Smoother Line Following: The robot can achieve a smoother path by comparing the readings from two sensors.
- More Robust: Handles curves and uneven surfaces better due to the combined sensor data.
- Less Calibration: May require less calibration compared to a single sensor approach.
Cons:
- More Complex Build: Needs two sensors, increasing parts and potentially build complexity.
- More Programming Complexity: Coding for two sensors can be more involved, especially for advanced techniques like PID control.
Here's a quick recommendation:
- Start with One Sensor: If you're new to line following, it's a great way to learn the basics of programming and sensor use. Tutorials for one-sensor robots are readily available online [WEB MINDSTORMS line following with 1 color sensor].
- Move to Two Sensors Later: Once comfortable, consider using two sensors for improved performance and explore more advanced line following techniques. Resources for two-sensor robots exist as well [WEB 2 Sensor PID Line Follower].
Remember: The best approach depends on your project goals and skill level. You can always experiment with both configurations to see which works best for your specific line and robot design.