CN204317744U - A kind of electronic coin penny bank - Google Patents

Abstract

The utility model provides a kind of electronic coin penny bank, the diameter of optoelectronic switch to different coin is utilized to detect, thus to dropping into wherein 1 yuan, 5 jiaos, the coin of 1 edged surface value carries out identifying and can demonstrate the electronic coin penny bank of total amount, comprises Detecting of coin module, power module, governor circuit module, display module.Detecting of coin module comprises detection raceway groove and the first optoelectronic switch, the second optoelectronic switch, the 3rd optoelectronic switch, the 4th optoelectronic switch.Power module is powered to Detecting of coin module, governor circuit module and display module, Detecting of coin module detects the coin dropped into wherein, and the detection signal input governor circuit module that will produce, governor circuit module processes detection signal and processing result information is transferred to display module.

Description

An electronic coin piggy bank

technical field

The utility model relates to an electronic coin piggy bank, which is an electronic coin piggy bank which uses a photoelectric switch to identify coins and can display the total amount of coins.

Background technique

Compared with other countries, my country's coin system has the characteristics of large material differences, multiple currencies, multiple versions, and large differences in casting parameters of the same coin in each version, which has caused considerable difficulties in coin identification. At present, the denominations of the main coins in circulation in my country are 1 yuan, 5 jiao, and 1 jiao.

At present, the coin denomination methods adopted at home and abroad include image method, eddy current sensor method and so on.

The image method is aimed at the characteristics of different coin images, using the invariant moment of the coin image as the input, and using the BP neural network to realize the recognition of various coin denominations. However, for coins that can be normally circulated, the recognition effect is better. When the face of the coin is so stained that it is difficult to distinguish with the naked eye, the image method is not competent.

The eddy current sensor method is that the eddy current sensor uses the eddy current effect to work, and can non-contactly measure various physical quantities whose surface is a metal conductor. It has the advantages of simple structure, wide frequency response range (from zero to hundreds of kHz), and high sensitivity. It has the characteristics of large measurement linear range (300μm-1000μm), small volume, and not affected by oil and other media. The eddy current sensor method includes frequency detection method, amplitude detection method and phase detection method.

The frequency detection method is to use the double-circuit eddy current sensor to detect the material, thickness and other parameters of the coin, which improves the recognition and detection rate of the coin. At the same time, in order to eliminate the influence of different initial coin insertion speeds on the frequency measurement, the least squares fitting algorithm is used, and the characteristic frequency corresponding to the average time of the coin passing through the coin channel is taken as the standard value, and the time of the coin passing through the coin channel detection interval is compared with The average time is compared, and the measured characteristic frequency is converted into the characteristic frequency value of the coin passing through the detection interval according to the least squares fitting line, and the value is compared with the characteristic frequency standard value, so as to judge the authenticity of the coin.

From the introduction to the principle of the low-frequency transmission electromagnetic sensor, it can be known that when the metal plate to be tested is placed in the two coils, an eddy current is generated in the metal plate. The phase difference between the induced potential and the excitation voltage changes, and the phase changes are different for conductors of different materials. Therefore, the identification of coins can also be realized by detecting the phase difference between the induced voltage and the excitation voltage. In this method, the phase information of the excitation voltage and the induced voltage must be collected. In order to obtain a digital signal that is beneficial to the controller, it must also undergo analog-to-digital conversion. The requirements for data sampling are relatively high, and in order to achieve higher precision, there are also high requirements for analog-to-digital conversion. Therefore, using this method to realize a high-accuracy coin identification device requires a relatively large cost.

Utility model content

The utility model provides an electronic coin piggy bank with high identification rate and low cost, which can identify coins with denominations of 1 yuan, 5 cents and 1 cent put into it and display the total amount of coins put into it. In order to solve the above problems, the utility model provides an electronic coin piggy bank which uses a photoelectric switch to detect the diameters of different coins, thereby identifying the value of the coins.

The electronic coin piggy bank provided by the utility model includes a coin detection module, a power supply module, a main control circuit module, and a display module. The coin detection module includes a detection channel and a first photoelectric switch, a second photoelectric switch, a third photoelectric switch, The fourth photoelectric switch. The power supply module supplies power to the coin detection module, the main control circuit module and the display module, the coin detection module detects the coins dropped into it, and inputs the detection signal generated into the main control circuit module, and the main control circuit module processes the detection signal and The processing result information is transmitted to the display module.

Preferably, the inner width of the detection channel is 5mm.

Preferably, the first photoelectric switch, the second photoelectric switch, the third photoelectric switch, and the fourth photoelectric switch are infrared through-beam counting detection sensors. The infrared cross-beam counting detection sensor is 25mm long, 25mm wide, and 16mm high. The signal output defaults to low level, and the output is high when the beam is blocked. The slot width is 15mm, including LM393 chip and through-beam infrared head. The heights of the first photoelectric switch, the second photoelectric switch, the third photoelectric switch, and the fourth photoelectric switch from the groove of the detection channel are 15mm, 16mm, 18mm, and 21mm in sequence.

Preferably, the control circuit module includes a STC89C52 single-chip microcomputer, and also includes a 74LS04 inverter chip, and the 74LS04 inverter chip converts the high level signal input by the sensor into the main control module 3 into a low level.

Preferably, the display module adopts 1602 character liquid crystal.

The utility model has a simple structure, and the components used in each functional module are mature products with stable and reliable performance, so the recognition rate is high and the cost is low.

Description of drawings

Figure 1 is a block diagram of the system

Fig. 2 is the front view of coin detection module;

Fig. 3 is the top view of coin detection module;

Fig. 4 is a schematic diagram of an infrared through-beam sensor;

Fig. 5 is a schematic circuit diagram of the system;

Fig. 6 is a main program display flow chart;

Fig. 7 is the flow chart of INTO service procedure;

Fig. 8 is an interruption flow chart.

Detailed ways

Below in conjunction with accompanying drawing, the specific embodiment of the present utility model is described in further detail.

As shown in Figure 1, the power supply module 2 supplies power to the coin detection module 1, the main control circuit module 3 and the display module 4, and the coin detection module 1 detects the coin dropped into it, and the detection signal that is produced is input to the main control circuit module 3, The main control circuit module 3 processes the detection signal and transmits the processing result information to the display module 4.

As shown in FIG. 2 , the first photoelectric switch 11 , the second photoelectric switch 12 , the third photoelectric switch 13 , and the fourth photoelectric switch 14 are infrared beam counting detection sensors. When in use, for the convenience of operation, the coin detection module 1 forms a certain angle with the horizontal plane, and the coin is dropped in the direction shown in the figure. The first photoelectric switch 11 is used to detect the presence or absence of coins, because when coins of different denominations are to be detected, the sensors all have high-level outputs, and the diameters of 1 jiao, 5 jiao, and 1 yuan coins are respectively 19mm and 20.5mm , 25mm, so the height of the photoelectric switch from the groove must be less than the diameter of the smallest coin (15mm), the second to fourth photoelectric switches are used to detect the face value of the coin, in order to make the 1 jiao, 5 jiao, 1 yuan coins pass the detection , only the output state of a corresponding photoelectric switch in the second to fourth photoelectric switches changes, and the second photoelectric switch 12 is a detection switch with 1 angle; the third photoelectric switch 13 is a detection switch with 5 angles; the fourth photoelectric switch 14 is 1 yuan detection switch. All photoelectric switches adopt infrared cross-beam counting detection sensor. The sensor is 25mm long, 25mm wide, and 16mm high. The signal output defaults to low level, and the output is high when the beam is blocked. Type infrared head, the schematic diagram is shown in Figure 4.

According to the diameter of the coin, it can be determined that the height of the corresponding photoelectric switch from the groove is 16mm, 18mm, and 21mm in turn. Considering the detection range of the photoelectric switch and the stability of the direction when the coin is detected passing through the channel, the width of the detection channel is designed to be 5mm.

The main control circuit module 3 adopts the STC89C52 single-chip microcomputer as the main control chip, and the display module (4) adopts 1602 character liquid crystals. Since the signal output of the infrared cross-beam counting detection sensor outputs a default low level, and the output is high when the light beam is blocked, and The STC89C52 MCU interface is triggered by low level, so it is necessary to add a non-gate chip (74LS04) to convert the signal of the infrared counter-shooting counting detection sensor to low level. The schematic diagram of the system circuit is shown in Figure 5.

The single-chip microcomputer program mainly realizes the functions of displaying and storing coin values and storing data during coin detection. The main program flow: firstly, the single-chip microcomputer system is initialized, then the data of coin statistics in E2PROM is read and displayed, and finally it is waiting for interruption. The flow chart is shown in Figure 6 Show.

Figure 7 is a flow chart of the INTO service program. The INTO sequence trigger is used as a sign of coin passing detection. The service program mainly completes the judgment of the output signal levels of the second to fourth photoelectric switches to determine the coin denomination and coin amount statistics.

The output of the first photoelectric switch is connected to the external interrupt 0 (INTO) of the single-chip microcomputer as the external interrupt signal of the single-chip microcomputer. When each coin is detected by the first photoelectric switch, an interrupt signal is generated as a sign of whether there is a coin passing. The output to the fourth photoelectric switch is connected to three I/O ports of the single-chip microcomputer. By querying the status of the 3 I/O ports, it can be determined which denomination coin is. The flow chart is shown in Figure 8.

All the mature functional modules in the prior art can be adopted for the parts not specifically introduced in the utility model.

The above is the preferred implementation of the utility model, and its description is more specific and detailed, but it should not be construed as limiting the patent scope of the utility model. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present utility model, and these obvious replacement forms all belong to the protection scope of the present utility model.

Claims (7)

1. an electronic coin penny bank, comprise Detecting of coin module (1), power module (2), governor circuit module (3), display module (4), it is characterized in that: described Detecting of coin module comprises the first optoelectronic switch (11), the second optoelectronic switch (12), the 3rd optoelectronic switch (13), the 4th optoelectronic switch (14) that detect raceway groove (15) and be located at detection raceway groove (15) top successively; Described power module is connected with Detecting of coin module, governor circuit module and display module respectively, the signal output part of Detecting of coin module connects the signal input part of governor circuit module, by the detection signal input governor circuit module produced, the signal output part of governor circuit module connects the signal input part of display module, is shown by the Detection Information after integrated treatment by display module.

2., according to electronic coin penny bank described in claim 1, it is characterized in that: described detection raceway groove (15) inner width is 5mm.

3., according to electronic coin penny bank described in claim 1, it is characterized in that: described first optoelectronic switch (11), the second optoelectronic switch (12), the 3rd optoelectronic switch (13), the 4th optoelectronic switch (14) are infrared emission count detection sensor.

4. according to electronic coin penny bank described in claim 3, it is characterized in that: the height of described first optoelectronic switch (11), the second optoelectronic switch (12), the 3rd optoelectronic switch (13), the 4th optoelectronic switch (14) distance detection raceway groove (15) groove is followed successively by 15mm, 16 mm, 18mm, 21mm.

5., according to electronic coin penny bank described in claim 1, it is characterized in that: described governor circuit module (3) comprises STC89C52 single-chip microcomputer.

6., according to the arbitrary described electronic coin penny bank of claim 1,3,5, it is characterized in that: described governor circuit module (3) comprises 74LS04 NOT gate chip; The high level signal that sensor is inputted main control module by described 74LS04 NOT gate chip is converted into low level.

7., according to electronic coin penny bank described in claim 1, it is characterized in that: described display module (4) comprises 1602 character mode lcds.