System specification:
1. The Temperature sensor must be a linear
temperature sensor, with adjustable current
source such as the LM35. Alternatively the
LM334 or LM391 from National Semiconductor
can be utilised.
2. A quasi-crystal of 10MHz must be hooked to the
micro controller to maintain a steady clock
frequency for the microcontroller internal clock.
3. A common cathode ssd, RS25 miniton display is
chosen as display for the system.
4. A static switch for the ssd through the port 2 and
port 3 must be configured using PNP silicon
bipolar junction transistor to pave way for
conformity to their individual biasing
requirements based on the input output (I/O)
logic.
5. The electromagnetic relay must exhibit the
following parameters: Coil resistance of 400Ω,
maximum current rating of 10Amps, and voltage
of 12V max.
6. The microcontroller must be fortified with a
power up reset at the pin 9, precisely manually
operated to reset the system at any time.