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You can buy it online from DNA Technology
or you can buy ready kits with selectable address lines and high current motor driver:
You will require a bluetooth module with UART o/p so you can connect it directly to any controller. you can buy one from here: http://www.dnatechindia.com/WIRELESS/Bluetooth-Module.html
Most of the GPS modules available in the Market Provide output in NMEA format so any GPS module will do. You can buy GPS Module from here: http://www.dnatechindia.com/GSM-GPRS-GPS/GPS-Module-With-Patch-Antenna.html
You can communicate in one direction if you use HT12E & HT12D as the RF modules used are RF Transmitter and RF receiver so for two way communication you will require an HT12E & HT12D on both sides one side transmitting on 433Mhz and the other side transmitting on 315Mhz.
Or you can use RF Transreceiver module: http://www.dnatechindia.com/WIRELESS/CC2500-RF-Transreceiver-Module.html
An electricity meter or energy meter is a device that measures the amount of electric energy consumed by a residence, business, or an electrically powered device.
Electricity meters are typically calibrated in billing units, the most common one being the kilowatt hour. Periodic readings of electric meters establishes billing cycles and energy used during a cycle.
Automatic Energy meter is the technology of automatically collecting consumption, diagnostic, and status data from energy metering devices and transferring that data to a central database for billing, troubleshooting, and analyzing.
This technology mainly saves utility providers the expense of periodic trips to each physical location to read a meter. Another advantage is that billing can be based on near real-time consumption rather than on estimates based on past or predicted consumption. This timely information coupled with analysis can help both utility providers and customers better control the use and production of electric energy.
For this you will require RF Trans Receiver Module for communication between the controller and the PC at MSEB’s end. And a software in PC to get the metere reading automatically and cut it off if payment is not made.
You can buy the RFID reader from DNA Technology: http://www.dnatechindia.com/RFID.html the RFID nodel number is EM18.
Instead of 89c51 use P89V51RD2 which is costlier than 89c51 but has ISP mode and can be easily programmed via MAX232 IC using flashmagic software. It is pin as well as code compatible with 89c51
You will require a bluetooth module which you can connect to the controllers UART pins……..you can find these modules easily in online shops check this link for one such module: http://www.dnatechindia.com/WIRELESS/Bluetooth-Module.html
You can use 16×2 alphanumeric display….its very simple to interface…check this link to know how to interface lcd to 8051 controller: http://www.dnatechindia.com/Tutorial/8051-Tutorial/Interfacing-LCD-to-8051.html
here is a link for code in C language: http://www.dnatechindia.com/Code-Library/C-Code-Library/LCD-INTERFACING-TO-8051-IN-8-BIT-MODE.html
and here is a link for code in assembly language: http://www.dnatechindia.com/Code-Library/8051-Assembly/LCD-Interfacing-To-8051-in-8-bit-mode.html
If you have time on your hand then go for PIC or AVR else go with the one you are comfortable with i.e. 8051 series
Quite simple dude use LM35 because its o/p is linear and you can calibrate it easily.
For ADC you can use ADC0804 single channel 8 bit ADC.
For keypad even two switches are sufficient one for increment and another for decrement.
Instead of showing lights on/off on led use a relay, you will require relay driver circuit to drive the relay using which you can acutually turn on/off fan. check this link for relay driver circuit: http://www.dnatechindia.com/Tutorial/8051-Tutorial/Interfacing-Relay-to-Microcontroller.html
since all other ports have 10k internal pull up resistor my suggestion is to go for 10k resistor. But the value of the pull up also depends for what you are using the pins for
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You can see an open collector o/p used in IC. In same way we have open drain o/p in 8051 port0. The output essentially acts as either an open circuit (no connection to anything) or a connected to ground. we use external pullup resistor to provide high volt (1) rather than providing open circuit output.
Because the pull up resistor is external and need not be connected to the chip supply voltage, a lower or higher voltage can be used instead. Open collector circuits are therefore sometimes used to interface different families of devices that have different operating logic voltage levels or to control external circuitry that requires a higher voltage
