The utility model relates to an electromagnetic gear shift automatic speed changing device for a machine tool. There are disclosed an automatic gear change control apparatus for an automobile and a method of controlling such apparatus. A rotational output of an internal combustion engine is connected to drive wheels of the automobile and a load device. When a gear shifting-up of an automatic transmission is to be effected, the load applied by the load device is increased, or the load is connected to an output rotation shaft of the engine via a selectively connecting device, thereby reducing the rotational speed of the output rotation shaft of the engine to a required level. In our project, three electromagnetic coils are coupled to the gear rod of the two ends. The ultrasonic sensor is used to sense the wheel speed and this signal is given to the microcontroller unit. The microcontroller is activate the relay depends upon the vehicle speed. There are four relays are used, one for freely movement, second for Level 1 gear, third for Level 2 gear and another one for Level 3.

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In modern era, opening and closing of doors is always a tedious job, especially in places like shopping malls, hotels and theaters where a person is always required to open the door for visitors. This project proposes a system of automatic opening and closing of door by sensing any body movement near the door. This is achieved with help of either sensor or switch control as per requirement. The door open/close signal is fed to a micro controller to operate a door motor through motor driver IC. When a body approaches within the operating range of the sensor, it sends a logical command to open the door. The door automatically closes with a fixed time delay.

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