This article creates a new method of controlling tool on / off electronic devices using Short Message Service (SMS). On / off electronic device controllers have been developed using Siemens C35 mobile phones as receivers on devices and other phones as controllers. In this study the receiver on the tool used SIM800L module, so to operate the device simply use a mobile phone. Apart from being a receiver, SIM800L can also send a reply to the mobile phone that is used as a controller. Work process

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... ools that have been made that the command in the form of SMS sent using the phone will be received by SIM800L and processed by ATmega328 microcontroller. If the command is processed in accordance with the program, then ATmega328 will turn on or off the relay that is connected directly with the electronic devices to be controlled. The created tool has been tested with 5 distance variations. Taken 50 attempts for each distance variation with randomly selected commands. The test results show that the tool is made quite effective to use, with an average accuracy of 92.62%.