Humidity Sensor Trainer is an educational tool designed to teach the principles and practical applications of humidity sensors. It allows learners to understand how humidity is measured, how sensors work, and how to interface them with microcontrollers for real-world projects. Humidity refers to the amount of moisture present in the air. It is measured as relative humidity (RH), which is the ratio of the current amount of water vapor in the air to the maximum amount of water vapor the air can hold at that temperature, expressed as a percentage.