RU156660U1 - TRAINING AND LABORATORY STAND "PLK-1" FOR THE STUDY OF MICROCONTROLLERS OF THE PIC16F FAMILY - Google Patents

Abstract

Training and laboratory stand "PLK-1" for studying microcontrollers of the PIC16F family, including a case, the front panel of which is the working area, inside the case there is a board containing a microcontroller (MK), characterized in that the front panel has an LED indication of the status of ports A and In MK, analog signal setting potentiometers connected to port A channels, digital signal toggle switches connected to port A and B channels of the MK, power indicator, switch of the stand operation in the Programming mode "and" Execution "mode, inside the case there is a power supply board, analogue amplifier board, in-circuit programmer board, RS232 interface board, dynamic head, on the case are a power switch, a connector for connecting a power adapter, a connector for connecting a USART cable from a personal a computer (PC) for establishing communication between the MK and a PC for data exchange, a connector for connecting a programmer cable from a PC for programming, a connector for connecting expansion modules, a reset button ikrokontrollera, test button dynamic head operation.

Description

The utility model relates to teaching aids in the field of microcontroller technology and electronics and can be used to conduct practical and laboratory work in this field in higher and secondary specialized educational institutions.

Microchip's in-circuit debuggers / debuggers ICD, ICD2, ICD3 are known for studying and debugging circuits with microcontrollers of the PIC16F and PIC18F series, respectively

(

64,005;

64035).

These devices are a module in a power supply case, to which a demo board is connected, containing a 2 × 6 LCD display, a temperature sensor, EEPROM memory, LEDs, a piezoceramic emitter, and a KS232 interface.

However, these devices are poorly suited for laboratory and practical exercises, since they have insufficient reliability and vandal resistance (there is no case for the demonstration board), a limited set of functional blocks.

A well-known educational laboratory stand for the practical study of microcontrollers (MK) Atmel ATMega 32 (Pat. RF No. 126865, publ. 04/10/2013), containing a control computing unit, an input interface unit and an output interface unit, a reset element, a rectangular pulse generator, a node RC circuits, adjustable voltage source, sound emitter, programmer, seven-segment indicator, dial field buttons, LED block, power supply +5, +12 V. Using the stand allows you to significantly reduce the learning time for the basics of programming MK and espechit protection devices with faulty connections during the laboratory work. In addition, the stand is economical due to the limited set of standard modules.

A well-known educational laboratory stand (Pat. No. 76147, published September 10, 2008), comprising a housing, the front of which is a work area and contains an information screen, output connectors of three clock signals with LED indicators, a keyboard, input and output connectors with LED indicators , the working area of interchangeable panels with a laboratory complex, a board with a microcontroller, a liquid crystal display, input and output buffer chips with connectors, a sound emitter, a connector for an en non-volatile memory, a connector for combining educational and laboratory stands in a network, input and output connectors are paired. The utility model is aimed at expanding functionality, increasing the reliability and convenience of the stand, increasing the efficiency of classes, reducing the cost of manufacturing.

The objective of the utility model is to develop, based on the available means, a training laboratory bench designed to study microcontrollers of the PIC16F family, which has advanced functionality, reliable, convenient and compact.

The technical result, which is achieved by the claimed utility model, is to expand the functionality of the educational and laboratory bench PLK-1 to study microcontrollers of the PIC16F family, as well as to increase the reliability, convenience and compactness of the stand.

To achieve the specified technical result, in the PLK-1 training laboratory bench for studying microcontrollers of the PIC16F family, which includes a case, the front panel of which is a working area, a board containing a microcontroller (MK) is located inside the case, an LED indication of the port status is located on the front panel A and B MK, analogue signal potentiometers connected to port A channels, discrete signal toggle switches connected to port A and B channels of the MK, power indicator, operation switch nda to the “Programming” mode and the “Execution” mode, inside the case there is a power supply board, analog amplifier board, in-circuit programmer board, RS232 interface board, dynamic head, on the case are a switch on switch, a connector for connecting a power adapter, a connector for connecting USART cable from a personal computer (PC) for establishing communication between MK and a PC for data exchange, a connector for connecting a programmer cable from a PC for programming, a connector for connecting modules extensions, microcontroller reset button, dynamic head operation check button.

The essence of the utility model is that the training and laboratory stand is made in a case, the front panel of which is a working area and is made in the form of a simplified circuit diagram of the device, and contains an LED indication of the status of two ports of the microcontroller (MK), it also has toggle switches and potentiometers designed to set the signals at the inputs of the MK. In the upper part of the front panel of the case there is a switch for the operation of the training laboratory stand: execution of the code programmed in the MK or MK programming. There are boards inside the case: a board containing an MK, a power supply board, an analog amplifier board, an in-circuit programmer board (which allows reprogramming the MK without removing it from the laboratory bench, which significantly increases reliability, ease of use with the bench) with a side-mounted connector enclosures, an RS232 interface board, the connection connector of which is also displayed on the side of the enclosure; To demonstrate the operation of the analog outputs of the MK, a dynamic head is installed inside the stand.

The proposed training laboratory stand is illustrated by the drawings shown in FIG. 1-3.

In FIG. 1 shows the appearance of the front panel of the stand body; FIG. 2-internal part of the stand, in FIG. 3-side view.

In FIG. 1-3 are the following notation:

1 - stand body;

2 - front panel of the stand;

3 - power indicator

4 - stand mode switch

5 - potentiometers for setting analog signals;

6 - toggle switches for setting discrete signals;

7 - LED indication of the state of ports A and B MK;

8 - the main board containing MK;

9 - dynamic head for sound output;

10 - toggle switch on the stand;

11 - connector for connecting a power adapter;

12 - connector for connecting the cable US ART;

13 - connector for connecting the programmer cable;

14 - MK reset button;

15 - button check the operation of the dynamic head; 16- connector for connecting expansion modules.

Training and laboratory stand "PLK-1" contains a housing 1, the front panel 2 of which is a working area (Fig. 1, 2). On the front panel 2 there is a power indicator 3, a switch 4 of the laboratory stand operation modes (“Execution” and “Programming”), potentiometers 5 for setting analog signals, toggle switches 6 for setting discrete signals and LED indication 7 of the status of the MK terminals (Fig. 1) . Inside the case 1 of the stand, the main circuit board 8 is installed, which contains the MK, as well as a power supply, an analog amplifier board, an in-circuit programmer board, an RS232 interface board, and a dynamic head 9 for outputting sound (Fig. 2). On the housing 1 there are a switch 10 for turning on the stand, connector 11 for connecting a power adapter, connector 12 for connecting a USART cable, connector 13 for connecting a programmer cable, MK reset button 14. On the housing 1 there are also a button 15 for checking the operation of the dynamic head 9 and a connector 16 for connecting expansion modules (Fig. 2).

To learn the principles of working with MK, a student develops a program on the MPASM macroassembler, which is part of the free software MPLab IDE, in accordance with the assignment. As a result of work, a hex-file is created, which is transferred to the stand using the programmer's program (WinPic, ICProg). In this case, the student first transfers the stand using switch 4 to the "Programming" mode (Fig. 1). After completion of the programmer’s program, the student transfers the stand to the “Execution” mode using the switch 4 (Fig. 1).

Next, the program code loaded in MK is executed. The analog-discrete input-output module provides the interaction of the user (student) with the channels of ports A and B MK. A set of toggle switches 6 connected to each channel of ports A and B is provided for inputting discrete information. For inputting analog information, potentiometers 5 are connected to the channels of port A to set analog signals, allowing voltage to be entered in the range from 0 to 5 V. channels there is a LED indication of 7 voltage on the corresponding output MK. In this case, the behavior of the toggle switches 6, potentiometers 5 and LED indicators 7 is determined by the program code.

To illustrate the operation of PWM (pulse width modulation) modules of the microcontroller, a board of analog amplifiers is built into the stand to convert the power of the signals from the PIC-MK terminals. The amplified signals are then fed to the built-in dynamic head 9. Thus, a change in the duty cycle and the frequency of the PWM leads to a change in the timbre and tone of the sound generated by the laboratory bench.

To program a new program code in the microcontroller’s memory, it is necessary to switch the switch 4 of the operating modes to the “Programming” state, connect a special cable from a personal computer to connector 13, and perform programming.

By connecting a USART cable from a personal computer to connector 12, it is possible (provided that the program code is correctly written) to establish a connection between the microcontroller and the computer through which data can be exchanged.

PLK-1 is not only a full-featured educational laboratory stand for studying the features of working with PIC16 microcontrollers, but also a flexible platform for implementing control of technological equipment, so it can be used in the educational process of disciplines related to the development and implementation of process control algorithms. The advantage of the training laboratory stand is compactness, which allows you to organize a laboratory in small rooms.

Claims (1)

Training and laboratory stand "PLK-1" for studying microcontrollers of the PIC16F family, including a case, the front panel of which is the working area, inside the case there is a board containing a microcontroller (MK), characterized in that the front panel has an LED indication of the status of ports A and In MK, analog signal setting potentiometers connected to port A channels, digital signal toggle switches connected to port A and B channels of the MK, power indicator, switch of the stand operation in the Programming mode "and" Execution "mode, inside the case there is a power supply board, analogue amplifier board, in-circuit programmer board, RS232 interface board, dynamic head, on the case are a power switch, a connector for connecting a power adapter, a connector for connecting a USART cable from a personal a computer (PC) for establishing communication between the MK and a PC for data exchange, a connector for connecting a programmer cable from a PC for programming, a connector for connecting expansion modules, a reset button ikrokontrollera, test button dynamic head operation.

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