Photoelectric sensor used in automatic meter reading system

With the development of microelectronic technology, sensor technology, computer technology and modern communication technology, photoelectric sensors can be used to develop automatic meter reading systems. The aluminum disk of the electric energy meter is driven to rotate by the torque generated under the action of the electric eddy current and the magnetic field. The photoelectric sensor can convert the number of revolutions of the aluminum plate into the number of pulses. For example, if the rotating bright aluminum plate is partially blacked, and equipped with a reflective photoelectric transmitting and receiving pair tube, when the aluminum plate rotates, pulses are generated in the partially blacked area, and the number of revolutions of the aluminum plate can be sampled It is converted into the corresponding pulse number, and sent to the T0 port of the CPU for counting processing through the photoelectric coupling isolation circuit. The use of photoelectric coupling isolator can effectively prevent interference signals from entering the microcomputer. Combined with other transmission methods, an automatic meter reading system can be formed.