Applications of the NAND gate
Burglar
alarm:
When the switch is closed one input of the NAND gate is LOW. When the
LDR is in the light the other input is LOW. This means that if either of these
things happen, i.e. the switch is closed or the light is on one of the inputs
is LOW, the output is HIGH and the buzzer sounds.
Freezer warning buzzer:
When the thermistor is COLD its resistance is
LARGE and the input to the NAND gate is high.
Since the NAND gate is connected as an INVERTER the output is LOW.
As the thermistor warms up its resistance decreases, the voltage across it falls and the input to the NAND gate falls.
When it becomes low enough the output becomes HIGH and the buzzer sounds.
Since the NAND gate is connected as an INVERTER the output is LOW.
As the thermistor warms up its resistance decreases, the voltage across it falls and the input to the NAND gate falls.
When it becomes low enough the output becomes HIGH and the buzzer sounds.
An automatic watering system:
This is designed to water plants
only if the contacts, which may be buried in the soil, are too dry and it is
night-time. The relay closes and starts the pump only if both these conditions
are fulfilled. (Presumably somebody waters the plants in the daytime because if
the switch is pressed the water pump works regard less.
Application of Ex-OR/Ex-NOR gate:
This type of
logic gates are used in generation of parity generation and checking units. The
two diagrams below shows the even and odd parity generator circuits
respectively for a four data.
With the help of these gates parity check operation can be also performed. The diagrams below show even and odd parity check.
Applications of NOR Gate:
One of the most famous
of which is using two of them to make one bit of memory.
Written by Unknown
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