Editing Humidity Detector Based on Quartz Crystal Oscillator (section)

=== Project Objectives and Scope ===
The primary objective of this project is to construct and characterize a functional, low-cost humidity detector driven by a custom Colpitts oscillator. The specific scope of work includes:

1. Design and hardware implementation of a 6 MHz Colpitts crystal oscillator using a 2N2222 transistor, ensuring stable and parasitic-free operation.
2. Application of a uniform sodium silicate (water glass) sensing layer onto the quartz crystal.
3. Calibration of the sensor by exposing it to environments with varying relative humidity and recording the corresponding frequency shifts.
4. Analysis of the sensor's performance metrics, including sensitivity, linearity, and response time.

Through this approach, the project aims to demonstrate that a fundamental electronic oscillator circuit, combined with a simple hygroscopic coating, can effectively replicate the core functionality of complex mass-sensitive humidity detectors.