High-frequency oscillation soil humidity measurement system

The invention discloses a high-frequency oscillation soil humidity measurement system. The high-frequency oscillation soil humidity measurement system comprises a probe, two oscillator modules, a frequency mixer module, a low-frequency low-pass filter module, a frequency divider module, a singlechip, and a digital display. The probe is equivalent to an adjustable capacitor and is connected with anoscillation circuit of the oscillator module I, the probe senses the change of the soil humidity, and the oscillation frequency of an oscillator changes as well. The system adopts two oscillator modules, so that a middle-frequency signal obtained by processing oscillation signals of the two oscillator modules through a frequency mixer is stabler. The middle-frequency signal is filtered and amplified, the frequency of the middle-frequency signal is divided, the middle-frequency signal is received by the singlechip and and calculated to obtain soil humidity data, the data flow into the digitaldisplay and are displayed.