Mould monitoring device, method and system based on weak electric signal

The invention discloses a mould monitoring device, method and system based on a weak electric signal. The mould monitoring device comprises a mould collector, a power supply end, a trans-impedance amplifier and an analog-to-digital converter, wherein the mould collector is coated with nutrients, and a substrate of the mould collector has conductivity; the power supply end is used for applying voltage to the substrate of the mould collector; the trans-impedance amplifier is used for amplifying the weak current generated on the substrate of the mould collector into a voltage signal; and the analog-to-digital converter is used for converting the voltage signal amplified by the trans-impedance amplifier into a digital signal, and the digital signal is used for determining the number of moulds.The mould monitoring device, the method and the system can carry out mould monitoring rapidly and conveniently, are high in accuracy degree, and can be widely applied to the technical field of smarthome. 本发明公开了基于微弱电信号的霉菌监测装置