i am going to do a 8052 based project in which we must be interface two s-series 8052 with each other but we have no idea about it. can anybody help me to suggest me how to interface two 8052 together.
actually we have to go to do gsm and rfid based automation and security system."In this project there will be sensors inside the home, if anybody comes forcibly to home the sensors output will give information to the system that somebody had came, then it will send the SMS to the owners mobile or make a call to police. Also in this project RFID is used to access or open the door. Controller will check whether the tag identification number provided by the RFID reader have the access permission or not. If have, access permission will be provided to that particular person, i.e. door control signal enabled. Otherwise an alert message will be sent to a predetermined mobile number and alarm will be activated. Each person’s access permissions can be seen on the LCD/ screen. EEPROM is used to keep the owner mobile no.,and also RTC is used to operate the devices automatically in case of mobile faillure. keypad is used to write the mobile no. and edit that one."
thus our problem is that we are unable to join all that one in one microcontroller due to lack of I/O port and space. so we have try to use two microcontroller but two microcontroller can be used through serial interfacing (TXD and RXD) pin which is also needed for GSM and RFID. finally we have decided to use only one microcontroller by removing RTC and some sensors.
now we need your suggetion and comment about that.
Thank you!!!
thus our problem is that we are unable to join all that one in one microcontroller due to lack of I/O port and space. sure you can if you want to stay with a '51 there are 8-porters giving you 64 I/Os, not to mention MMIO or port expanders. Or go for an ARM where the sky is the limit
Erik
1) SPI consumes one extra pin (slave select) for each extra peripherial device you connects. May be EEPROM, RFID reader, bus expansion ... You can even connect external UART, or Ethernet over SPI.
2) I2C consumes zero extra pins for connecting more hardware. So if EEPROM uses I2C then you can get a bus expansion with zero extra processor pins.
3) It is trivial to connect latched shift registers, consuming 3 bits (latch,shift,data out) to drive any number of output signals. Or you could instead use shift registers for reading lots of input signals. And they are cheap.
4) 40-pin DIL isn't the only alternative out there.
5) 8051 isn't the only alternative out there.
There are many, many options available when designing a system. A large part of the design is to consider what processor to use and what peripherial hardware. Many times, you same money by getting a bigger processor since you pay very little for the extra peripherial support that gets included with the bigger chips. That is one of the reasons why the ARM chips have taken lots of market ground.
Note that there may be strict legal limits on automated calls to the police - and heavy penalties for abuse...
It isn't uncommon that automatic burglar alarms requires alarms from two separate sensor types before they may call to an alarm center - for example a glass break sensor and a volume alarm from a movement sensor.
in my project, user contact no. and name entered by keypad must be display on lcd for further edit and that same word mmust be stored on eeprom for database. then during a sms through gsm modem the contact no. and password must match with no. and password stored on the eeprom to automate the devices through relays. but i have no ideas about c code based on 8051/8052. so please, could you help me to provide me ideas about my project code.
i have no ideas about c code based on 8051/8052
is that "i have no ideas about c code" or "i have no ideas about 8051/8052" or both
"i have no ideas about c code based on 8051/8052"
1. About 'C' code 'C' is a long-established and very common programming language indeed - there are plenty of resources to help you with learning 'C'; eg,
http://www.keil.com/books/ http://www.keil.com/events/links.asp publications.gbdirect.co.uk/.../
2. About 8051/8052 The 8051/8052 is a long-established and very common microcontroller architecture indeed - there are plenty of resources to help you with about the 8051/8052 architecture; eg,
http://www.8052.com/book http://www.8052.com/tutorial http://www.keil.com/books/8051books.asp
For specific details of Keil's C51 implementation for the 8051/2, Please read the manual: http://www.keil.com/support/man_c51.htm http://www.keil.com/appnotes/list/c51.htm http://www.keil.com/download/list/c51.htm
"we have to go to do gsm and rfid based automation and security system ... have no ideas about c code based on 8051/8052."
So why do you have to do this project when you lack these basic skills which are so obviously necessary to it??