Wireless sensor network node microsignal input and interface module

The utility model discloses a network node two way signal input and interface module of a wireless sensor, which relates to a network node two way signal input and interface module of a wireless sensor for measuring the gate loading. An operational amplifier circuit (4), an A/D converting circuit (3), a parallel port expanding input circuit (2) and a single chip microcomputer circuit (1) are orderly connected in series, and the output end of the single chip microcomputer circuit (1) is connected with the input end of the parallel port expanding input circuit (2) and the input end of the A/D converting circuit (3) respectively. The linear of the module amplifier is good, the utility model has little effect of the air humidity, the result is stable, and the error is little; the utility model adopts the two way A/D converting circuit, to eliminate the signal loss caused by the analog switch, and to multiple the converting speed of the analog quantity; an embedded microcontroller AT89S8252 adopts non bus-organized to perform a parallel I/O port expanding, which not only saves cost but also improves the reliability of the system, and the design is flexible and simple.