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Learn to measure carbon dioxide levels using microcontrollers and two distinct sensor types in this 29-minute tutorial. Explore the critical importance of monitoring CO₂ concentrations, understanding that while outdoor levels around 400 parts per million are safe, indoor concentrations can become dangerously elevated and potentially harmful. Compare the ENS160 sensor, an inexpensive device that measures estimated CO₂ (eCO₂), with the SCD41 sensor, which provides actual carbon dioxide measurements at a slightly higher cost. Master the implementation of both I2C sensors using a Seeeduino XIAO ESP32-S3 microcontroller, though any 3.3-volt microcontroller will work effectively. Follow along as each sensor is tested individually before combining them in a single circuit for comprehensive air quality monitoring. Understand the fundamental differences between eCO₂ and actual CO₂ measurements, and discover practical applications such as automatically activating ventilation systems based on detected levels. Gain insights into the carbon cycle's role in regulating life on Earth and why indoor air quality monitoring has become essential for maintaining safe breathing environments.
