Counting function of radio frequency sensor in money counter.5.8G Frequency microwave sensor module

　　RF sensor applications will penetrate into all aspects of human life

　　Radio frequency sensor in bar code scanning pen

　　When the scanning pen head moves on the bar code, if it encounters a black line, the light of the light-emitting diode will be absorbed by the black line, and the phototransistor will not receive the reflected light, showing high impedance and being in the cut-off state. When the white space is encountered, the light emitted by the light emitting diode is reflected to the base of the photosensitive transistor, and the photosensitive transistor generates a photocurrent to conduct. After the entire bar code has been scanned, the phototransistor deforms the bar code into individual electrical pulse signals. The signal is amplified and reshaped to form a pulse train, which is then processed by a computer to complete the identification of the bar code information.

　　One of the essential components in the money counter is the radio frequency sensor. The counter of the money counter adopts non-contact infrared photoelectric detection technology, which has the advantages of simple structure, high precision and fast response speed.

　　The counter of the money counter uses two sets of infrared radio frequency sensors. Each sensor is composed of an infrared light-emitting diode and a photosensitive triode that receives infrared light, leaving a proper distance between the two.

　　When no banknotes pass, the receiving tube is turned on by light, and the output is 0. When a banknote passes through, the infrared light is blocked, the luminous flux of the receiving tube is insufficient, and the output is 1. After the banknote passes, the receiving tube receives the infrared light and conducts it again. In this way, a pulse signal is generated at the output of this part of the circuit. These signals are shaped and amplified by the subsequent circuit and then input into the single-chip microcomputer. The single-chip microcomputer drives the execution motor and completes the counting and display accordingly. The reason why the banknote counter uses two sets of radio frequency sensors is to detect the integrity of the banknotes and prevent the remaining coins from being counted.

　　The radio frequency sensor is used to detect the counting of banknotes to realize the accumulation of the number of banknotes, and then use the liquid crystal and external display part to intuitively display the number of banknotes to the user, and automatically alarm the user when an abnormality occurs.

　　With the development of microelectronics technology, sensor technology, computer technology and modern communication technology, radio frequency sensors can be used to develop automatic meter reading systems. The aluminum plate 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 use of radio frequency sensors can convert the number of revolutions of the aluminum disk into the number of pulses. For example: Partially paint black on a rotating bright aluminum plate, and then equip it with a reflective photoelectric transmitting and receiving pair tube. When the aluminum plate rotates, pulses are generated at the local blackened area, and the number of revolutions of the aluminum plate can be sampled. Converted to 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.

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