A GSM module or a GPRS module is a chip or circuit that will be used to establish communication between a mobile device or a computing machine and a GSM or GPRS system.
A LED or Light Emitting Diode is a Semiconductor two terminal(Pin) component, the two terminals are (+)Positive and (-)Negative. The voltage is applied to positive terminal and negative terminal should be ground light is emitted. Here we are using 12V LED so the maximum Voltage for positive terminal is 12V and minimum is 3V. If we use anything above 12V the LED will get short circuit.
Vibration motor is a compact size coreless DC motor used to informs the users of receiving the signal by vibrating, no sound. Vibration motors are widely used in a variety of applications including cell phones, handsets, pagers, and so on.
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