Vernier Software and Technology
Vernier Software & Technology

Pressure Indicator


Keeping auto tires properly inflated optimizes tire performance and fuel economy. An underinflated tire cannot maintain its shape and builds up excessive heat potentially leading to tread separation. Underinflation increases rolling resistance, and reduces steering precision and cornering ability. An overinflated tire is stiff and unyielding, resulting in a harsher ride. It is much more susceptible to damage when running over a pothole or debris in the road. In 2000, all new cars in the US were required to have a built-in tire pressure monitoring system to warn drivers when underinflation reached 25%. The minimum requirement was that all cars have a warning light on the dash, however more elaborate systems also indicate wheel position. As an Engineering Extension Activity to the “Gas Pressure and Volume” experiment, you will use a Vernier Gas Pressure Sensor and Digital Control Unit (DCU) to simulate an auto tire pressure monitoring system.

Learning Objectives

  • Turn on an LED when the reading from a Gas Pressure Sensor drops below 10 psi.
  • Control a sensor-based system with the DCU.

Reference Experiments

Vernier Lab Book Experiment
Physical Science with Vernier 30 Gas Pressure and Volume
Middle School Science with Vernier 19 Fun with Pressure
Chemistry with Vernier 6 Boyle’s Law

Sensors and Equipment

Download Extension

The download includes student instructions, DCU tips, teacher information, and examples in PDF and Microsoft® Word® formats.

Pressure Indicator

About Engineering Extension Activities

Engineering Extension Activities provide a way to add an engineering component to a Vernier science experiment. Use sensor data and Logger Pro software (or LabQuest 2) to help solve an engineering problem.

See All Engineering Extension Activities »

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