Speed Control of DC Motor using Microcontroller 8051 with Circuit Diagram

The aim of developing this project is to control the speed of DC motor. The main advantage in using a DC motor is that the Speed-Torque relationship can be varied to almost any useful form. To achieve the speed control an electronic technique called Pulse Width Modulation is used which generates High and Low pulses. These pulses vary the speed in the motor. For the generation of these pulses a microcontroller (AT89c51) is used. As a microcontroller is used setting the speed ranges as per the requirement is easy which is done by changing the duty cycles time period in the program. Continue reading Speed Control of DC Motor using Microcontroller 8051 with Circuit Diagram

Rain Sensor for Automatic Irrigation System

When we have an automatic irrigation system, we experience the joy of watching the water run while the rain falls. Besides looking silly, this is a waste of water and can damage your lawn and garden. Thankfully, there is a solution to this problem: installing a rain sensor. Rain sensors detect natural rainfall and shut the irrigation system off until the rain has stopped and the sensor has dried off. These devices can be used with any brand or type of wall-mounted irrigation controller, and there are several types available. Continue reading Rain Sensor for Automatic Irrigation System

Adaptation in Standard CMOS Processes with Floating Gate Structures and Techniques

Abstract :-
We apply adaptation into ordinary circuits and systems to achieve high performance, high quality results. Mismatch in manufactured VLSI devices has been the main limiting factor in quality for many analog and mixed-signal designs. Traditional compensation methods are generally costly. A few examples include enlarging the device size, averaging signals, and trimming with laser. By applying floating gate adaptation to standard CMOS circuits, we demonstrate here that we are able to trim CMOS comparator offset to a precision of 0.7mV, reduce CMOS image sensor fixed-pattern noise power by a factor of 100, and achieve 5.8 effective number of bits (ENOB) in a 6-bit flash analog-to-digital converter (ADC) operating at 750MHz. Continue reading Adaptation in Standard CMOS Processes with Floating Gate Structures and Techniques