In this project we measure the speed of motor and when motor speed is change.According to the speed of the motor we change the gear from 1 to 4 automatically. display microcontroller 89s51 interface . in this project we will use stepper motor for gear control. We will use 12v motor. We will ue DC motor also Whose speed When we vary with variable resistance then speed of DC motor will vary. We will use Seven segment display
Microcontroller provide a signal to the motor circuit. Motor is not directly connected with the microcontroller. For the safety of the main processor we interface the motor with optocoupler circuit. Here we use pc 817 ( 4 pin opto coupler) to interface the micro controller with the motor circuit. We use H bridge circuit with the motor. H bridge basically control the movement of the motor. With the help of this H bridge we change the direction of the motor. We use four transistor circuit with each motor. We are using four transistor circuit. Out of these four transistor two transistor is NPN and two transistor and PNP transistor. One NPN and One PNP provide a one direction voltage and motor moves on one direction. Second NPN and second PNP transistor again change the direction of the motor automatically.In this project we will also try to attach Sensors for security purpose. We will use fire sensors-temperature based and LPG sensor. We will also try other sensor.