To control the speed of a motor, there are different ways. But in this tutorial, we are explaining simple and easy way by using the pulse width modulation (PWM). The modulation is a process of varying the parameter of a carrier signal in accordance with the instantaneous value of the message signal. The modulation process is used to reduce the size of the antenna and increases its efficiency. PWM is a technique used to generate the analog signals from the digital devices like MCU. All the modern MCU’s have dedicated hardware for PWM signal generator.
In the industrial automation, the Temperature Sensor is used to measure the temperature. The temperature sensor uses the converter to convert the temperature value to an electrical value. To read the temperature correctly & control the temperature in the industrial applications the temperature sensor is used more widely. In between the different types of sensors, we can make large peculiarities and the sensors will have the different properties like temperature range, contact-way, sensing element, and calibrating methods. The temperature sensor consists of a sensing element together in housings of plastics or metal. By using the conduction circuit the sensors will reflect the charge of environmental temperature.
The field of wireless communication is enormous and demands modernization. This proposed system that aims to interface android with microcontroller via Bluetooth, exposes lots of methods to work in this field. The project creates communication between an android mobile and microcontroller by enabling it to transmit and receive inflation and then by android mobile to simply control other devices which are connected to the microcontroller. The method of interfacing android with microcontroller through the Bluetooth device will help to develop this project named “android based smart phone used for induction motor control” because, in this project android mobile is interfaced with the microcontroller through the Bluetooth. This project is designed to control the speed of an induction motor like fan using an Android based smart phone. In home automation-related applications, the convenience of remotely controlling the speed of a fan can be achieved.
In 1880 Curie brothers invented the direct piezoelectric effect in a certain solid crystalline and dielectric substance such as quartz. The piezo word originates from the Greek word piezein, which means to press. The Piezoelectric sensor is a sensor used to measure the change in the pressure, force, temperature and acceleration. The general benefits of the piezoelectric accelerometer are it has a wide frequency range, the output noise is very low, there is no external power supply is required & it has self-power generating.
If any unexpected fluctuation in the power supply may cause many problems in the industries, homes, offices. Voltage fluctuations in the electric power supply have a very poor effect on connected load. These fluctuations of over voltage and under voltage protection system are produced by many reasons which are like voltage surges, limiting, overload and etc. General applications of these systems are used in agriculture motors, water pumps and etc. In this article, we will discuss the different control structures like timers and comparators of the under voltage and over voltage protection system.