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| Buzzer |
Buzzer
is the devices are output transducers converting electrical energy to sound.
They contain an internal oscillator to produce the sound which is set at about
400Hz for buzzers. Buzzers have a voltage rating but it is only approximate,
for example 6V and 12V buzzers can be used with a 9V supply. Their typical
current is about 25mA. Buzzers must be connected the right way round, their red
lead is positive (+).The buzzer used in the project is 5V buzzer. It is direct
connected to PIC. Whenever invalid entry detected the buzzer will turn on. Else
it remains off.
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