Sensor and knee joint brace

A sensor, used for a knee joint brace, comprising:

• a sensor bottom shell;
• a synchronous rotating component;
• an angle sensing instrument;
• and
• a circuit component arranged in sequence from bottom to top,
• wherein one end of the synchronous rotating component is rotatably connected with the sensor bottom shell, and the other end of the synchronous rotating component is connected to the angle sensing instrument;
• wherein the angle sensing instrument is electrically connected to the circuit component, and
• wherein the synchronous rotating component comprises:
• a rivet, one end of the rivet extending out from the sensor bottom shell, and another end of the rivet comprising a transmission shaft pick connecting slot extending along a first direction perpendicular to an axis direction of the rivet;
• and
• a transmission shaft pick, one end of the transmission shaft pick comprising a rivet connecting part facing the rivet and extending along the first direction to be coupled with the transmission shaft pick connecting slot of the rivet, and another other end of the transmission shaft pick being connected to the angle sensing instrument.