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  • Miniature Tool For Operating A Lamp With ( Short Message Service ) is innovate because it is usually turned on and off using the switch interface , but the switch can be turned on if a user in close proximity. In designing this tool ArduinoUno , GSM Module , Input Relay , LCD 16x2 Using Input 5V / DC while the lights and need Relay Output voltage of 220V / AC . The operation of this tool the user must have a mobile with available credit and a good operator simcard then Module GSM in an active simcard .