Explanation
of Each Block:
1.
Power supply:
Microcontroller Needs
+5V DC for its operation so 230V AC is stepped down to 9V AC, then rectified
using four 1N4007 diodes (connected in full wave bridge rectifier
configuration). Then this DC as it is pulsating need to be smoothened, so a
large value electrolytic capacitor is used for filtering. LM7805 (+5V voltage
regulator) is used to provide constant +5V DC even if we have voltage
fluctuation in 230V AC
2. Microcontroller:
We are using 8051 microcontroller. It has a 8 bit CPU for operation of data. It
has low power RISC based architecture. It is available in 40 pin DIP package.
The AT89S51 is a low-power, high-performance CMOS 8-bit microcontroller with 4K
bytes of in-system programmable Flash memory.
The device is manufactured using Atmel’s
high-density nonvolatile memory technology and is compatible with the industry
standard 80C51 instruction allows the program memory to be reprogrammed
in-system or by a conventional nonvolatile memory programmer. By combining a
versatile 8-bit CPU with in-system programmable Flash on a monolithic chip, the
Atmel AT89S51 is a powerful microcontroller which provides a highly-flexible
and cost-effective solution to many embedded control applications. The AT89S51
provides the following standard features: 4K bytes of Flash, 128 bytes of RAM, 32 I/O lines, Watchdog timer, two data
pointers, two 16-bit timer/counters, a five vector two-level interrupt architecture,
a full duplex serial port, on-chip oscillator, and clock circuitry. In
addition, the AT89S51 is designed with static logic for operation down to zero
frequency and supports two software selectable power saving modes.
No comments:
Post a Comment