This device comprises of a pressure sensor which measures the current atmospheric pressure. This sensor is controlled by a microcontroller.

This project can be used to maintain the control various devices. Here a mobile phone is interfaced to different devices and according to the sms received each device can be controlled.

Mileage Indicator monitor and display the online mileage of a vehicle as a remedy to avoid the human interference to perform the mathematical calculation to know the mileage. . The designed system consists of two kinds of sensor setup. A set of optical sensors provide the information about the quantity of fuel supplied to the carburetor pump and proximity sensor measures the distance traveled by the vehicle corresponding to the measured quantity of the fuel. A microcontroller, an integral part of the system accesses the data provided by both the sensors and computes the mileage.

This project is one, which has a major part to play in the real world today meeting all the electronic applications in an bus.

The system consists of an ultrasonic transducers. The transmitter generates an ultrasonic sound of frequency 40 Hz. The receiver monitors the intensity of the signal and is given to a microcontroller unit.

The microcontroller based device lock is an access control system that allows only authorized persons to access a restricted area Programmable number lock system is a high security number lock system that can be used to lock electronic devices.