- Price: $14.50
- Pros: Could be used to detect obstacles in front of the robot as well as uneven terrain. Sufficient range (4cm-5m), easy to implement with Arduinos
- Cons: Is a bit expensive especially considering it may not be necessary
Gyro and Accelerometer
- Price: $39-$79
- Pros: for sensor fusion for calculating position, velocity and orientation. gives exact position and easy to implement
- Cons: Costly
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