Now you can catch the burglar:-
We can use single NAND gate to make burglar alarm. This can be done by using NAND gate (combination of NOT and AND gate ),an LDR (light depending resistor), a push button Switch S and an alarm on picture attached.
Cinnect LDR between NAND gate input B and rhe positive terminal of the battery.
The LDR will cause a High level input '1' at B when in light because of its Low resistance. The LDR will cause a low level input '0' at B when light is interrupted and cause high resistance in LDR .
A low level signal is also caused at A when burglar steps on switch S.
si this burglar alarm sound when either burglar interrupts light falling on LDR or steps on switch S.
We can use single NAND gate to make burglar alarm. This can be done by using NAND gate (combination of NOT and AND gate ),an LDR (light depending resistor), a push button Switch S and an alarm on picture attached.
Cinnect LDR between NAND gate input B and rhe positive terminal of the battery.
The LDR will cause a High level input '1' at B when in light because of its Low resistance. The LDR will cause a low level input '0' at B when light is interrupted and cause high resistance in LDR .
A low level signal is also caused at A when burglar steps on switch S.
si this burglar alarm sound when either burglar interrupts light falling on LDR or steps on switch S.
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