Vernier Software and Technology
Vernier Software & Technology

Cooling Fan


Normal body temperature is generally around 37°C (98.6°F), but each person’s actual temperature varies by age, activity, and time of day. The human body is very good at keeping its temperature within a safe range despite the temperature of the surrounding air. If you are too hot, you may begin to sweat, and as the sweat evaporates, it helps cool your body. Wind, or blowing air, makes it easier for the air to evaporate sweat from your skin. As a STEM extension to the “Hot Hands” experiment, you will use a Vernier Digital Control Unit (DCU) to turn on a small DC fan when the temperature reading from the Stainless Steel Temperature Probe exceeds a threshold value.


  • Turn on a fan when your hand temperature exceeds a threshold value.
  • Control a sensor-based system with the DCU.

Reference Experiment

Sensors and Equipment

Vernier Technology

Additional Materials

  • 5 VDC fan

Download Extension

Download Extension

Reference Experiment

A Hot Hand” – Experiment 1 from Middle School Science with Vernier

About STEM Extensions

STEM extensions provide a way to take an existing Vernier science lab experiment and easily incorporate STEM. Use sensor data, the Vernier Digital Control Unit and Logger Pro software to quickly create sensor-based control systems.

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