Vehicle is one item that is very prone to theft because the price is quite expensive. Therefore, this tool is made for security systems in vehicles, especially in the car. This tool utilizes a mini PC as a central controller system. The mini PC devices used is Raspberry Pi with the size of a credit card. This car security system utilizing the features of the General purpose input output (GPIO) in Raspberry Pi. The car security system works by detecting the movement of human in the car and send the information to the owner of the car via sms , then sound the alarm , turn off the ignition system of the car , and lock the car doors . The car security system uses a PIR sensor to detect object, the GSM modem to send SMS to the owner of the car by using the AT command, dc motor as the driving gear to lock the car doors, the relay as a switch that is connected to the ignition system of the car, the LED as an indicator of movement of human and speakers to sound the alarm.