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Four-Day Event Features 51 Classes - Embedded Design Topics

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Just a friendly reminder: registration for 2017 India MASTERs 2017 closes on 24 November.

This four-day event features 51 classes, and is a great opportunity to learn about a variety of embedded design topics and get answers to your design questions from our experts.

 

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Completing Modified Sine Wave Inverter Design with Full Bridge Circuit and Step Up Transformer - (Part 10/17)

Contributor: 

Diksha

Modified Sine Wave Inverter in actionIn the previous tutorial, a half wave bridge circuit with IR-2110 gate driver circuit was designed. The working principle of a modified sine wave inverter has been already discussed. Now it's time to complete the circuit of Modified Sine Wave Inverter. The complete sine wave inverter can be designed using full bridge circuit and a step up transformer.

The aim of this project is design an inverter which can output a quasi sine waveform having a frequency of 50 Hz and 220 V peak voltage. So all the building blocks will be combined in this tutorial to make the final circuit of the sine wave inverter. 

Arduino Based Air Quality Monitoring IOT Project

Contributor: 

Hari Prasaath K

Arduino based IOT device for Real Time Air Pollution MonitoringAir pollution has become a common phenomenon everywhere. Specially in the urban areas, air pollution is a real-life problem. A lot of people get sick only due to air pollution. In the urban areas, the increased number of petrol and diesel vehicles and the presence of industrial areas at the outskirts of the major cities are the main causes of air pollution. The problem is seriously intensified in the metropolitan cities. Also, the climate change is now apparent.

The governments all around the world are taking every measure in their capacity. Many European countries have aimed to replace petrol and diesel vehicles with the electric vehicles by 2030. Even India has aimed to do so by 2025. The use of coal for electricity generation is now going to be a thing of past. The nations are now focusing to generate energy from nuclear reactors and the renewable resources like solar energy, wind energy and hydroelectric power. 

Designing Gate Driver Circuit and Switching Mechanism for Modified Sine Wave Inverter - (Part 9/17)

Contributor: 

Dikhsa
Gate Driver Circuit for Modified Sine Wave InverterIn the previous tutorial, basic operation of a modified sine wave inverter was discussed. It was mentioned in the previous tutorial that the H-bridge MOSFET circuit of the quasi sine wave inverter cannot be directly interfaced with the microcontroller circuit. There is a need of a Gate driver circuit as an intermediate circuit between the microcontroller and the H-bridge MOSFET circuit. The H-bridge MOSFET circuit generates a modified sine wave by switching the MOSFETs in a sequential manner with predetermined delay.
 
This sequential switching of the MOSFETs in the previous tutorial was explained with the help of a truth table and circuit diagrams.

Designing Modified Sine Wave Inverter - (Part 8/17)

Contributor: 

Dikhsa

Modified Sine WaveformIn the previous tutorial, square wave inverter was designed. Square wave inverter was simple to design but had certain drawbacks. The AC appliances are actually designed to operate on sine wave and square wave though being AC signal does not match to an ideal sine wave.

Due to this, when an appliance is powered by a square wave inverter, it may have noise or humming sound during its operation. So, designing of a modified sine wave inverter will be discussed in this tutorial.

Designing Switching Mechanism with Step Up Transformer for Square Wave Inverter (Part- 7/17)

Contributor: 

Dikhsa
Half Bridge Square Wave Inverter Circuit in ActionIn the previous tutorial, a square wave generator was designed having a symmetric output waveform having 50 Hz frequency and 12 V peak to peak voltage. The square wave generator designed using 555 timer IC was meant to provide input square wave in the inverter circuit.
 
Now, it is time to complete the square wave inverter circuit by adding a switching mechanism and step up transformer in the previous designed circuitry. The square wave generated from the 555 IC based circuit has peak to peak voltage of 12 V. This voltage needs to be stepped up using a step up transformer. So a step up transformer of 12V-0-12V rating is used for this purpose. But not only the voltage need to be simply stepped up, there is also a need for switching mechanism which allows drawing power from the inverter on power failure.

Designing Square Wave Inverter for UPS (Part - 6/17)

Contributor: 

Dikhsa
Square Wave Inverter Block Diagram The square wave inverter is easy to design and suitable for less sensitive electronic devices. For more sensitive electronics, the supply from square wave inverter can result into noise. In this tutorial, a square wave inverter is designed which will input power from a battery and output a square AC waveform. An Inverter should generate an AC signal at the output but that signal is not necessarily an exact sine wave.
 
A square wave can also be considered as an AC signal which can be used to drive less sensitive AC devices.

Keypad Controlled RF based Wireless Robot

Contributor: 

Hari Prasaath K
AVR based Keypad Controlled Wireless RobotIn robotics, wireless robots are commonly used for applications that need to be operated remotely. Usually such robots are controlled with a remote control that connects with the robot using a wireless technology like RF, Zigbee, Bluetooth, Wi-Fi or Mobile network. In this tutorial, a wireless robot will be designed that will connect with the remote control using 434 MHz RF module.
 
The remote control will have a keypad to control the movement of the robot. Keypads are one of the commonly used Human Machine Interfaces (HMI) and play an important role in small embedded systems where human interaction or human input is needed.Matrix keypads are well known for their simple architecture and ease of interfacing.

 

Switching mechanism for Linear Regulator Single Cell Li-ion Battery Charger using microcontroller and relay (Part -5/17)

Contributor: 

Diksha

In the previous tutorial, the Constant Current (CC) Source of 60 mA and Constant Voltage (CV) Source of 4.2 V were designed using LM317 voltage regulator IC. The constant current source is to be used for constant current mode of the battery charging while the constant voltage source is to be used for constant voltage mode of the battery charging. During the designing of constant current source and the constant voltage source, testing a Li-ion battery before charging it was also discussed. Check out the previous tutorial “Basics of Li-ion battery charging” for learning about the basics of Lithium ion batteries, their charging methods and topologies.

Designing Constant Current and Constant Voltage Source for Single Cell Li-ion Battery Charger (Part- 4/17)

Contributor: 

Diksha
Battery linear charger real time circuit arrangementIn the previous tutorial, the basics of Lithium ion batteries were discussed. Also, it was discussed how it is important to handle these batteries with care. as mentioned in the previous tutorial, that Lithium ion batteries need to be charged using CC-CV method, in this tutorial, a Li-ion battery charger for a single-cell Li-ion battery of nominal voltage 3.7 V will be designed. 
 
There are charger modules available in the market which can be used to charge the Li-ion batteries. In this tutorial, a charger built using the basic electronic components including Linear Regulator will be designed from scratch. The charger circuit will be customized as per the battery specifications and the charging requirements.