红外门卫，实现基于51单片机和双红外对射的人员出入计数系统，具有误判率低、报警语音提示、人数限制、远程控制、参数断电记忆、等功能，属原创，已实际测试，效果很好。-Infrared guard, 51-based single-chip and dual-beam infrared counting system of personnel access, with false positive rate is low, the alarm voice prompts, limit the numb