Ultrasonic vs. Time-of-Flight

Chapter: 7 — Building and Programming a No-Display STEM Robot

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About This Poster

This chapter explains in prose why it prefers time-of-flight sensors over ultrasonic ones — this poster shows the physical difference between the two: a sound-based module with two transducers versus a light-based module with one sensor window.

How to Use

• Explore — click a sensor to see how it measures distance.
• Quiz Me — test whether you can match a fact to the right sensor.
• Edit mode — open main.html?edit=true to drag the zone corner handles and calibrate boundaries once the poster image is generated.

Zones

1. Ultrasonic Sensor — times a sound-wave echo
2. Time-of-Flight Sensor — times a reflected infrared light pulse