Instrument for testing circuit boards by using single chip microcomputer

The invention relates to an instrument for testing circuit boards, in particular to an instrument for testing circuit boards by using a single chip microcomputer, which comprises a single chip microcomputer PIC16F877A, a scanning type resistance input circuit, a resistance field selecting circuit, a user interface circuit, a circuit board checking mold, a connecting part and a software part. The instrument for testing circuit boards by using the single chip microcomputer, which is provided by the invention, is used for testing semi-finished products of the circuit boards; because the circuit boards are tested by using small current and 5V voltage, the instrument has high safety and is different from special testing instruments, the instrument of the invention can test and process the resistance on the circuit boards at high speed by using simple and quick methods, increases the efficiency in continuous flow production, has wide application range, can be used for projects of producing any circuit board dependi