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REAL TIME, TIME SEQUENCE CONTROL SYSTEM FOR MACHINES
INTRODUCTION
This project is based on VTU syllabus. The proposed system is based on ATMEL 89S52 µcontroller which is in our syllabus.
For doing this project we use some of the software like
 Embedded C for programming the application software to the microcontroller.
 Protel schematic software is used for designing the circuit diagram for this project.
 Express PCB software is used for designing the PCB for this project.
(Since PCB making is a big process and involves lot of machineries which are expensive, we are going to outsource this to the manufacturer.)
DESCRIPTION: In some condition we have to switch on and off machine at a particular time. If the machines are one or two means we can control the machines manually. If the number of device is more, at that time this job is little bit complex. So we can design an event management system i.e. real time sequence control system for machines.
RTC will give the real time. The on time and off time of each machine is set by using switches. The microcontroller will switch on and off the device according to the set time. Through menu we can set the timings. Time will be displayed in LCD. Relays are used to connect device to the microcontroller.
TECHNOLOGY USED: Automation of machines.
PERCENTAGE OF SOFTWARE AND HARDWARE USED
Embedded C: 40%
Microcontroller Hardware: 60%
COMPONENTS USED
 Power Supply :5v DC
 Micro controller :AT89S52
 Real Time Clock : DS1307
 LCD :16x2 characters
 Relays
 Buzzer. : Freq-1 to 18 kHz (5v-12Vdc)
 Switches
SOFTWARE USED:
Embedded C.
WORKING PRINCIPLE
The components used in this project are microcontroller, LCD, RTC, relays, switches, and buzzer
This is event management system. That means when an event comes it will do a particular operation. In this project we can control five devices. It has switches to set the on and off time of each device. RTC will give the real time.
Four switches are used in this project. By pressing ‘menu’ switch we can enter into menu mode. From there we can set the on time and off time of each device by using ‘up’ and ‘down’ switches. By pressing ‘exit’ switch we can come out from the menu. The timings are stored in RTC memory.
The real time will displays in LCD. Whenever the RTC time equals on time of a particular device the microcontroller will make the corresponding relay on. It will make the device on. Whenever the RTC time equals the stop time of a particular device the microcontroller will make the corresponding relay off. So that making that device off. Buzzer will make beep sound for every operation.
In this way the microcontroller will control all the devices attached to it.