PB 001 is an 8051 based development board with the following features:

a)      On Board Power Supply.

b)      P89v51RD2 Microcontroller.

c)       EEPROM 24C256 for data logging.

d)      Real Time Clock (RTC) DS1307 with battery backup.

e)      MAX 232 for PC interface. Can also be used to interface with GSM Module, Fingerprint Module, RFID Module.

f)       One, Two Line, Sixteen Characters LCD.

g)      One Relay which can be activated deactivated using Microcontroller.

h)      Four Switches.

i)        Four LED’s.

The Circuit Requires 5 Volts for normal Operation. This 5 volt is generated using a step down transformer, rectifier & a voltage Regulator.  Click here for Power Supply Details.

We have used Phillip’s P89V51RD2 microcontroller because it can be directly programmed using Flash Magic Software without removing the microcontroller.

P89V51RD2 is an 8-bit 80C51 5 V low power 64 kB Flash microcontroller with 1 kB RAM. The P89V51RD2 is an 80C51 microcontroller with 64 kB Flash and 1024 bytes of data RAM. A key feature of the P89V51RD2 is its X2 mode option. The design engineer can choose to run the application with the conventional 80C51 clock rate (12 clocks per machine cycle) or select the X2 mode (6 clocks per machine cycle) to achieve twice the throughput at the same clock frequency. Another way to benefit from this feature is to keep the same performance by reducing the clock frequency by half, thus dramatically reducing the EMI. The P89V51RD2 is also In-Application Programmable (IAP), allowing the Flash program memory to be reconfigured even while the application is running.

The AT24C256 provides 262,144 bits of serial electrically erasable and programmable read only memory (EEPROM). It can be interfaced using the I2C Protocol.

Real-time clock (RTC) DS1307 counts seconds, minutes, hours, date of the month, month, day of the week, and year with leap-year compensation valid up to 2100. A Battery is provided so that the RTC can retain time even after Power Failure. The RTC can also be interfaced with the microcontroller using the I2C Protocol.

The controller has a single UART port through which it can communicate serially with the PC. But for converting the 0 & 5 volt signal into PC’s plus minus 12v we require a line driver IC for which we use MAX 232.

A 2x16 LCD is used in 8-bit mode and can be used to display the real time.

Four Tactile Switches can be used as keypad to the controller.

Four LED’s are connected to the controller for testing purpose.

One Relay can be directly controlled by the Microcontroller. The relay can be directly used to turn on/off motors, bulbs, heaters etc.

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