β± 15:30
π 6,180
π‘ Wally Sensors in Full
βΆοΈ Video Playback Area
Wally Sensors Explained
π Ultrasonic HC-SR04
| Attribute | Parameter |
|---|---|
| Range | 2cm~400cm, Β±3mm |
| Principle | Emit ultrasound β receive echo β compute time diff |
| Formula | distance(cm) = high-level time(us) Γ· 58 |
π΄ Infrared Obstacle Module
Detection 2~30cm, digital output (0/1), infrared emit + reflect detect.
β¬ Grayscale Line Sensor TCRT5000
Detection height 3~10mm, black/white reflectivity difference, for tracking / maze.
π Three-Sensor Comparison
| Dimension | Ultrasonic | Infrared | Grayscale |
|---|---|---|---|
| Range | Far (4m) | Near (30cm) | Near (1cm) |
| Output | Analog distance | Digital yes/no | Analog/digital |
| Light affect | None | Yes | Yes |
| Best for | Obstacle avoid | Collision prevent | Line follow |
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