1. Access Control System
This project Access Control System is used in the places where we need more
security. It can also used to secure lockers and other protective doors. The system
comprises a number keypad and the keypads are connected to the 8 bit microprocessor
8085 through the programmable peripheral IC 8255. This is one of the popular microprocessor.
The microprocessor continuously monitor the keypad and if somebody enters the password
it will check the entered password with the password which was stored in the memory
and if it they are same then the microprocessor will switch on the device. In our
Project we are controlling a electrical device. The password can be an four digit
number. If we enter the correct password then the microprocessor will switch on
the load. If we want to switch off the load simply press the digit 0 in the keypad.
2. Automatic Night Lamp with Morning Alarm
This Project “Automatic Night Lamp with Morning Alarm” was developed using
Microprocessor. It is the Heart of the system. The sensors are made with help of
LDR which are Light Dependent Resistors, whose Resistance is inversely proportional
to the Light falling on it. The LDR converts the light energy into electrical energy
and this variable electrical energy was converted into digital signal (0 or 1) by
using the timer IC555. The Timer IC output goes low when light falls on the LDR
and the timer IC output goes high when the LDR was placed in dark.
3. Automatic Plant Irrigator
The Project presented here waters our plants regularly when you are out
for vocation. The circuit comprises of sensor parts built using op-amp IC LM324.
Op-amp’s are configured here as a comparator. Two stiff copper wires (for one sensor)
are inserted in the soil to sense the whether the Soil is wet or dry. The Microprocessor
was used to control the whole system. It monitors the sensors through the programmable
peripheral interface (PPI) IC 8255. When more than two sensors sense the dry condition,
then the Microprocessor will switch on the motor and it will switch off the motor
when all the sensors goes wet. The Microprocessor does the above job by receiving
the signals from the sensors through the PPI, and this signals operated under the
control of software which is stored in ROM. We are using the 8 bit Microprocessor
8055 and the programmable peripheral interface IC 8255.
4. Digital gates Emulator
This project “Digital gates Emulator” is used to emulate the basic gates
such us NOT, OR, AND. The system has the selector switch by which we can select
any gate. The system has two inputs and one output. We use two SPDT switches for
the inputs and for the output we use an LED. The gate selection can be done by the
selector switch and it is also indicated on separate LED’s. There are three LED’s
provided on the board for the gates NOT, OR, AND. The corresponding LED will glow
for the corresponding gate. The main operation is done by the Microprocessor through
its ports using the PPI (Programmable Peripheral Interface) IC8255. The microprocessor
gets the input through the ports and it will produce the output according to the
gate selected.
5. Digital Visitor Counter
Digital visitor counter is a reliable circuit that takes over the task
of counting Number of Persons/ Visitors in the Room very accurately. When anybody
enters into the Room then the Counter is Incremented by one and when any one leaves
the room then the Counter is Decremented by One. The total number of Persons inside
the Room is displayed on the seven segment displays. The microprocessor do the above
job it receives the signals from the sensors, and this signals operated under the
control of software which is stored in the Memory. The sensors are made with help
of LDRs which are Light Dependent Resistors, whose Resistance is inversely proportional
to the Light falling on it. The Laser Torch is used as the Light source and it is
focused on the LDRs, the Microprocessor continuously watches the LDRs.
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