reporte en inglés

8/12/2019 Reporte en Ingls

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INDEX

I. INTRODUCTION ........................................................................................................................... 2

II. PROJECT DESCRIPTION ......................................................................................................... 2

III. OBJECTIVES .............................................................................................................................. 2

IV. MATERIALS AND METHODS.................................................................................................. 3

FIRST STAGE OF THE PROJECT ........................................................................................... 3

CIRCUIT SIMULATION ............................................................................................................... 4

SECOND STAGE PROJECT ..................................................................................................... 4

MICROCONTROLLER PROGRAMMING ................................................................................ 4

MOUNT TABLE NODES ............................................................................................................. 5

THIRD STAGE PROJECT .......................................................................................................... 5

DESIGN PRINTED CIRCUIT BOARD (PCB - PRINTED CIRCUIT BOARD)..................... 5

CARD CREATION ........................................................................................................................ 5

V. LIST OF COMPONENTS ........................................................................................................... 6

VI. RESULTS .................................................................................................................................... 6


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INDEX

I. INTRODUCTION

Today's digital design has focused on because programming of programmable

devices is arranged as the microcontroller, which can reduce the number of

electronic devices necessary for a given system.

A microcontroller is an embedded system that has in its internal structure a

microprocessor, random access memory (RAM), read only memory (ROM) through

its programming is used for specific purposes. This paper details the design and

construction of the control system of a water using PIC16F877 microcontroller.

II. PROJECT DESCRIPTION

The system of control of water has 3 sensors that lets the device to know what is

the water level and 1 water bomb at the output.

The main element of the project is PIC16F877A microcontroller is a programmable

device, our project is mainly focused on programming it.

The operation of the project is the next, first the bomb is off until the sensor

localized in the tank sends a signal that there is not water on it. The microcontroller

put on the bomb and when the thank is full another sensor will be activated to turn

out the bomb.

III. OBJECTIVES

GENERAL PURPOSE

Designing the electronic control circuit of a control of on PIC16F877

microcontroller.

SPECIFIC OBJECTIVES

Create the program that governs the operation of the microcontroller.

Create electronic circuit control system.

Present design with a small-scale representation of the system.


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IV. MATERIALS AND METHODS

The main elements of the project are:

Programmable Device. Microcontroller PIC16F877A

Water Pump

Sensors. We used switches as sensors

The PIC16F877A was chosen for its characteristics of memory storage allow us

the source program and the number of ports required to implement the circuit. The

PIC16F877 microcontroller

Microchip belongs to a large family of 8-bit microcontrollers (data bus) having the

following general characteristics:

Harvard architecture.

CMOS Technology

These and other features indicated in the manufacturer's data sheet we provide a

highly efficient use of program and data memory and therefore the speed of

execution device.

FIRST STAGE OF THE PROJECT

1. Creating the Source File.

2. Circuit Simulation.

SOURCE FILE CREATION

The source file is compiled and makes the machine code that needs to be

programmed into the microcontroller. This has the extension. "Hex".

We use the basic compiler ldmicro than is in the same program ldmicro por PIC.

Which has a high level language that facilitates the creation of the file or source

code to be compiled and then get the file or machine code (". hex ") to be recorded

in the microcontroller

It was necessary to master the rules, instructions and basic libraries of this

programming language, for we use the help of the teacher, manuals and tutorials

found online and forum pages with examples easy to get familiar with this program.


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It is at this stage of the project where the device characteristics, type of

microcontroller, operating frequency, ports used as input, ports used as output,

logic used, which is why it was necessary to carry out the simulation of the circuit in

which electric and physically these options are defined.

CIRCUIT SIMULATION

It is in the simulation of the circuit where the electrical work as well as being quick

and effective tool for observing and then debug the source file, correct errors and

make improvements to the design used is specified.

We used the ISIS Design Suite - Proteus 7 Professional version 7.5 SP3 for

developing simulation of the easiness in handling the PIC microcontroller family.

Connecting the main characteristics are:

Port D: Output to control water bomb step that is responsible for fill the tank.

Port A: Entrance sensors (switches).

We worked with a 4MHz clock signal obtained from quartz crystal.

SECOND STAGE PROJECT

1. Programming the Microcontroller

2. Mounting Chart Nodes

MICROCONTROLLER PROGRAMMING

To implement the simulated circuit, it is necessary to program the microcontroller.

We use PIC 600 FOR PIC, to set the source file to PIC16F877A microcontroller.

The device has an interface to the process.

The steps were as follows:

1. Choice programming device, our case PIC16F877A

2. Reading device

3. Checking if the device is free of programming "Blank_Check".

4. Erasing any program on your device, result from above "Error"


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5. Upload File. "Hex" to be recorded on the device

6. Programming the device.

MOUNT TABLE NODES

Once the operation of the circuit in the simulation stage was verified, we proceeded

to mount in node table and test them.

We use the available equipment as a power source for the 5V required by the

microcontroller, switches and sensors for simulating.

At the end of this stage again verified the operation of the control circuit.

THIRD STAGE PROJECT

1 Designing Printed Circuit Board (PCB - Printed Circuit Board)

2. Creating card

DESIGN PRINTED CIRCUIT BOARD (PCB - PRINTED CIRCUIT BOARD)

We use Design Suite ARES - Proteus 7 Professional version 7.5 SP3, and PCB

Wizard - Professional Edition 3.50.

CARD CREATION

The creation of the board was following the following steps:

1. The design was printed on paper acetate .

2. We use a household iron to heat-set design to the blank card, some copper face

of ink on printed paper.

3. Unwanted copper according to the tracks was removed by using a nitric acidsolution with water for about two minutes.

4. Clean the card.

5. Necessary holes were drilled.

6. They proceeded to solder components.


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V. LIST OF COMPONENTS

MAIN CARD

Microchip Microcontroller PIC16F877A

ULN2803

4 MHz crystal

22 pF ceramic capacitors

10 Kresistors

push-button switches

DIP-40 Base

DIP-18 Base

VI. RESULTS

In the second stage of the project note that not behaved to as we expect, we hadproblems with the main board connections this was because the design was

originally made wrong, we solve the problem by redesign the diagram

After all settings and drawbacks encountered in assembling the project, the

designed control system worked properly responded to the structure created as

expected.

VII. CONCLUSIONS

We created the program and the control of water using PIC16F877 microcontroller

and its representation on a small scale with a model, demonstrating the importance

of the programmable devices in reducing design both combinational and sequential

logic.

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