Single-chip microcomputer control function training device

ZN-7600A single-chip microcomputer control function training device
1. Overview
ZN-7600A single-chip microcomputer control function training device adopts a desktop structure made of painted steel plate. The drawer cabinet of the training platform is used to store the training modules, and the training module mounting bracket is arranged between the drawer cabinet and the countertop, and the upper layer is the workbench countertop. When used in skill competitions, place the equipment installation base plate on the table, install the modules required by the single-chip control device prepared by the test questions on the base plate, connect the control circuit, and input the control program into the single-chip microcomputer. Press the operating command switch, and the single-chip control device will press The program runs.
Placed in the MCU training room, this is a training platform. When explaining the relevant knowledge in the theory or training project, it can be used as a desk; when the actual operation is needed, open the table to expose the modules placed on the mounting bracket, and follow the training requirements between the required training modules By connecting the circuit and writing the control program, you can teach the single-chip technology according to the designed training project. Flexible connection between modules, deepen the understanding of the principle of single-chip microcomputer, can complete I/O training, A/D training, D/A training, LED LCD dot matrix module, etc.

2. The equipment should have technical indicators
1. Input power: single-phase AC 220V±10% (50Hz)
2. Output power:
DC ±12V±5%/0.5A
DC ±5V±5%/3.5A
DC 24V±5% /6A
3. Temperature: -10～40 ℃; Ambient humidity: ≤90% (25℃)
4 Dimensions 1250mm×690mm×820mm (L×W×H)
5. Power consumption of the whole machine: ≤0.5 kW
6. Safety Protective measures: It has the functions of grounding protection and leakage protection, and its safety conforms to relevant national standards. The mains uses high-insulation safety sockets and high-strength safety test leads with insulating sheaths.
Third, the functional characteristics of each functional module
1. Host module
The ZN-7600A single-chip microcomputer control function training device uses Atmel's AT89S52. This one-chip computer is equipped with 256Byte RAM and 8KByte FLASH, three 16-bit timers, two data pointers, and a watchdog circuit is integrated on the chip. 64KRAM expansion space, 64KROM expansion space; 32 IO ports, 6 vector interrupt sources; 0 _{33MHz operating frequency, three-level program encryption function; working voltage 4.0V} 5.5V. The use of DIP40 package is convenient for chip replacement and simulation. And it is designed with an in-system download design interface, which can be easily programmed through a USB downloader without removing the single-chip microcomputer from the circuit.
There is also a serial communication interface on the module. The interface has been added to the boost circuit and can communicate directly with the computer. The Philips MCU and Macrocrystalline MCU can also download programs through this port. A manual reset button is added to the reset circuit, which can be directly reset. There is also an active buzzer drive circuit on the module, which can emit a sound directly to a fixed level.
2. Power supply module The
power supply module adopts linear power supply and switching power supply. Chips such as single-chip microcomputers use linear power supply, which can effectively reduce program runaway caused by power interference. High-power devices such as motors are powered by switching power supplies to ensure that sufficient power is provided. The power supply adopts the leakage protection switch as the main control, which is safe and reliable. The low-voltage electricity is controlled separately with the boat-shaped switch, and the mains and low-voltage electricity are controlled separately. The module has three groups of independent low-voltage power supplies, of which two groups are positive and negative dual power outputs. An AC220 output board is placed on the panel, and three instruments can be connected at the same time. Each power supply has a fuse for overload protection.
3. The emulator module is
equipped with a high-performance single-chip simulator, which can simulate MCS51 series single-chip computers with full functions, and can also simulate software; the software is independently developed by China, which can well support Chinese, support keyword prompts, and automatically complete symbol matching and other functions . Supports 64K program address breakpoints, 64K source program effective line breakpoints and 64K temporary breakpoints, and the status of the internal registers of the microcontroller is clear at a glance. The host computer and the computer adopt the popular USB interface.
4. Display module
This module is included from basic display elements LED light-emitting diodes to advanced LCD screens. The specific configuration is 8-bit marquee (logic level indication), 8-bit digital tube dynamic display, 16×32 dot matrix LED screen, 1602 character LCD screen, 128×64 drawing LCD screen. The display devices commonly used in the single-chip microcomputer are all included, so that the learner can access all the display schemes and can be handy when designing the man-machine interface.
5. Relay module The
relay is a commonly used actuator and a commonly used isolation component. It can use low voltage to control high voltage circuits and remotely switch the status of strong current circuits. At the same time, its actuator is also a coil. Produce electromagnetic interference. For this reason, the relay module adds optoelectronic isolation measures on the basis of the integrated drive circuit. The module has a total of 8 relays, and the switch contacts of each relay are all led out and clearly marked; each relay is also equipped with a working indicator, which makes it clear when the relay is energized. Six of the eight sets of relays are electromagnetic relays, and two are solid state relays. The electromagnetic relay has two groups of relays controlled by AC220, which can control the forward, reverse and stop of the AC motor, and can be connected to the electronic wire through the conversion head. The other six groups are output for electronic connection sockets. The relay contact capacity is 250V/6A, DC28V/12A.
6. Instruction module
The input components commonly used by single-chip microcomputers are placed on the instruction module. Among them, there are 8 independent keyboard interfaces, 8 8-bit switch inputs, and 4 4 rectangular keyboard interfaces, which can satisfy students from basic to advanced, simple to complex Training requirements. If the user needs more buttons or a more complex design, you can use the PS2 keyboard and mouse interface of this module for expansion.
7. ADC/DAC module
Two conversion chips ADC0809 and DAC0832 are designed on the ADC/DAC module. In order to facilitate debugging of programs and hardware, three functional sub-modules are onboard: 0-5V analog voltage output, 8-level LED level indicator and active clock generator. The ADC0809 experiment can use an active clock generator as the chip clock, 0-5V analog voltage output can be used as the analog quantity, and the 8-level LED level indicator can be used as an indicator of the analog quantity; in the DAC0832 experiment, the chip’s The output is connected to the 8-level LED level indicator, and it is clear at a glance whether the conversion result is normal.
8. AC and DC motor control module
This module can complete the control experiment of two kinds of motors, namely 24V DC geared motor and 220V AC geared motor. A photoelectric switch counter is placed under the turntable of each motor, and the single-chip microcomputer can be used to sense its position and how many revolutions it has rotated. Each motor control circuit is equipped with an over-travel protection input port, which can effectively protect the safety of the motor and mechanism when it is combined with the horizontal moving device for experiments.
9. Stepper motor control module
This module is equipped with a 24V two-phase stepper motor and high-power stepper motor driver. The module changes the motor's axis-rotation operation mode and adopts a horizontal movement mechanism, which can change the motor's axis rotation to horizontal linear motion, and is indicated by the scale of an aluminum ruler. This module can also be used as a closed-loop control experimental project, because the motion mechanism is equipped with a closed-loop element that senses distance. At the same time, an over-travel protection circuit is designed. When the mechanism reaches a program-unknowable state, the motor power supply can be automatically turned off to avoid damage to the mechanism over-travel. The linear motion mechanism is equipped with left and right limit output terminals for the single-chip microcomputer to query the status.
10. Sensor adapter module (4 sensor interfaces) The
sensor adapter module is a circuit unit designed for sensor connection and electrical isolation. The unit has two groups of 16 optically isolated IO ports, each of which is optically isolated IO Both ports can imitate PLC and connect with 24V power supply sensors. And equipped with four-way sensor conversion interface for the connection of industrial sensors.
11. Expansion module
Because the control method of 82C55 still has learning value, it is still present in many textbooks. The expansion module can meet the needs of experiments; all three ports of 82C55 are led out, which can be connected by electronic wire or cable. . The control terminal and the data communication port are arranged together, and the overall layout is beautiful and generous. There is also a 74LS245 chip, which can be used to combine with 82C55 to complete different experimental functions.
12. Temperature sensor module
This module is equipped with two chip-type temperature sensors: digital temperature sensor 18B20 and analog temperature sensor LM35. The LM35 device is also equipped with an operational amplifier, and the amplified analog quantity can improve the measurement accuracy. Each sensor has a transparent shell reinforced protection, there are high-power heating resistors, heating indicators and so on. The working status is clear. It can be used for constant temperature control, thermostat and other experiments.
13. Intelligent material handling system
Configure a dual-axis robot as an assembly actuator, with X-axis and Y-axis execution capabilities, which can complete functions such as intelligent grabbing and discharging; it is
equipped with a travel switch, photoelectric sensor, and optical fiber sensor. It can ensure the accurate positioning of each actuator; when it
exceeds a large stroke, it has hardware automatic protection function to ensure system safety and personal safety; it can realize the hardware simulation, instruction simulation, and operation status simulation of the single-chip microcomputer to complete the application software development software simulation The device can make full use of the computer's software and hardware resources, reduce the difficulty of software development, and improve development efficiency.
4. The teaching desk is equipped with a portable electronic signal test record module.
Open laboratory information management system: (with certificate) the
necessary hardware and software resources should be available for the construction of an open laboratory:
(1) Hardware resources: a 7-inch color touch screen is used as a student terminal
(2) Virtual instrument part:
1. The terminal part (installed on the student test bench) is also equipped with a virtual oscilloscope, a virtual spectrum analyzer, a virtual three-meter, and power management.
2. Optional circuit analysis basics, analog electronic technology, communication electronic circuits, digital electronic technology, information signal processing, electronic measurement and instrumentation, sensors and automatic control principles and other experimental modules to complete relevant course experiments and build engineering measurement and control systems.
4. Parameters:
1) Dual-track storage oscilloscope, multiple synchronization methods, programmable storage depth; Number of channels: 2 channels Bandwidth: 20MHZ Resolution: 8 bits Voltage range: -10~+10V Storage depth: 64K
2 ) Spectrum analyzer;
3) Digital three-purpose meter
1. Main server description The
main server material uses linux operating system, and uses php+mysql to realize web operation. The server can be connected to any PC that can be connected to the network, which can realize remote control to complete the following functions:
manage student accounts, manage experiments, receive student work, correct student work, and remotely switch terminal equipment. The password setting interface is used to modify the login password of the web interface. The network setting interface is used to set the ip address of the server. The device management interface is used to add, delete, and switch terminal devices. Department setting interface, used to add, delete, and modify department information. Class setting interface, used to add, delete, and modify class information. The student setting interface is used to add, delete, and modify student information. The experiment item interface is used to add, delete, modify, and count experiment information. The experiment management interface is used to query and correct students’ experiment conditions.
2. SCM part
1. Marquee experiment
2. Independent key input experiment
3. Matrix keyboard interface training
4. Optocoupler isolation input and output experiment
5. Metal detection training
6. Relay isolation control experiment
7. Static digital tube display experiment
8. Dynamic digital tube display experiment
9. Buzzer performance experiment
10.8255 chip expansion IO port experiment
11. LCD module control training
12. Dot matrix LED screen Chinese character display experiment
13. AD conversion experiment
14. DA conversion experiment
15. LM35 temperature sensor acquisition experiment
16. External interrupt photoelectric counting control motor training
17. Timer interrupt control Motor training
18. Open loop stepper motor control training
19. AC and DC motor system experiment
20. Constant temperature room control system experiment
21. PS keyboard communication experiment
22. RS232 communication experiment
3. Intelligent material handling device part
23. Sensor technology practice Training
24. DC gear motor application training
25. Pneumatic circuit application training
26. Screw drive mechanism application training
27. Linear motion unit positioning control training
28. MCU programming training