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Arduino Based AC Voltage Control using Zero Voltage Crossing Detection

Contributor: 

Pawan Kumar

Arduino Based AC Voltage Control using Zero Voltage Crossing DetectionA lot of Arduino projects involve controlling devices running on DC voltage. The devices running on DC voltage are usually controlled by changing logic at GPIO pins for switching control or by PWM for operational control. There are times when devices running on AC current also needs to be controlled by the microcontroller.

For switching control, the AC appliances are usually interfaced to microcontroller boards via relays or relay circuits. For operational control over AC appliances like controlling the speed of a fan or dimming a light bulb, power electronics comes into the picture. This project is a demonstration of operational control of AC appliances using zero voltage crossing detection.

Making Li-ion batteries safer: Cell balancing as an important design feature

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Making Li-ion batteries safer: Cell balancing as an important design featureThe energy density of Lithium-ion (Li-ion) batteries is two to ten times more than other battery technologies. But, Lithium-ion uses a flammable substance as an electrolyte. If overcharged or overheated, Li-ion cells are a fire risk. 

Cell balancing equalizes the voltages and state-of-charge (SOC) among the cells, when they are at full charge. Balancing can be either voltage-based or SOC-based. It’s a non-trivial task that – ideally — aims both to increase the life of a battery pack and to enhance battery safety.

Virtual Retinal Display

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Shalem Pravas

A machine consists of many sub systems working together to perform a certain task. The information from the electronic devices are retrieved from the machine sub systems as binary code. All this information is presented in a user readable formatthrough a display device. The display technology has seen a rapid growth in the past few decades from the old CRT (Cathode Ray Tube) displays to the presently in demand LCD (Liquid Crystal Display) and LED (Light Emitting Diode) displays. The LCDs and LEDs consists of two dimensional arrays of individual display units (pixels) whose number to size of display determines the clarity of the display (resolution).

Fujitsu Develops Circuit Technology for Improving Energy Efficiency of Deep Learning Hardware

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Neha Rastogi

Fujitsu Develops Circuit Technology for Improving Energy Efficiency of Deep Learning HardwareFujitsu Laboratories Ltd. had recently made an announcement regarding the development of a circuit technology. It would improve the energy efficiency of deep learning hardware by reducing the data bit width used in the process. Also, it won’t require changing network structures or training algorithms. 

In deep learning, massive calculations are involved based on training data. However, the upper limit to processing performance is governed by the electricity volume used by servers and other hardware that carry out the processing. Hence, increasing performance per watt has become a crucial issue. So, the latest circuit technology from Fujitsu aims to address this problem.

Constant +/-9V DC Symmetrical Power Supply Circuit (Part 5/13)

Contributor: 

Ayush Jain

In the previous project, a constant 12V DC power circuit with current limitation of 1A was designed. In this project, a symmetrical dual power supply with constant voltage outputs will be designed.  A symmetrical dual power supply can provide two symmetrical voltages at the output with opposite polarity with respect to a common ground reference.

Every electronic circuit needs a proper power supply at the input for its optimum functioning. The power supply of any device or circuit should be chosen as per its power requirements. In this project, a regulated power supply circuit which can output constant voltages of 9V and -9V with 1A maximum current is designed.

Arduino based Accelerometer driven DC Motor Speed Control

Contributor: 

Pawan Kumar

Arduino based Accelerometer driven DC Motor Speed ControlDC motors are commonly used in electronics projects. A lot of projects require controlling the speed and direction of rotation of DC motors. The DC motors have voltage and RPM ratings. The RPM (Rounds Per Minute) rating indicates the maximum speed with which the motor can rotate. The speed of a DC motor varies with the voltage supplied to it.

The motor rotates at the maximum speed when it gets the supply equal to its voltage rating. For supply voltages lower than their voltage rating, DC motors rotate at lower speeds. For example, a DC motor with 18V 200 RPM rating can rotate at the maximum speed of 200 RPM when the supply voltage to it is 18V. For supply voltage lower than 18V, it rotates at lower speeds.

Innovative digital interface increases throughput in data-acquisition systems

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Gopi

To meet today’s challenge of transmitting data to a host with as little latency as possible and to simplify the interfacing with modern MCUs, processors and FPGAs, Texas Instruments has developed multiSPI™, an interface that increases data transfer rates between ADCs and digital hosts, while decreasing the required clock frequency. MultiSPI retains compatibility with standard SPI. In multiSPI, throughput is increased buy the use of 4 data output lines and double data rate transfer (DDR), which allows data transfers on both on the rising and falling edge of the SPI clock.

GLXP: Google's Mission to the Moon

Submitted By: 

Neha Rastogi

Google Lunar X Prize CompetitionAfter choosing five finalists from a group of 16 teams, the Google Lunar X Prize Competition (GLXP) has reached its final stage. In this race, 5 teams are now competing with each other for prize money worth 20 Million USD. To register a victory in the challenge, the teams have to launch a spacecraft to the lunar surface, explore it by covering at least 500 meters, and then send back high-definition videos and images. 

The first lunar lander, which succeeds to accomplish all these tasks by the end of this year i.e. 31st December 2017, will be declared as the winner. The Google Lunar X Prize teams competing in the final stage include SpaceIL (Israel), Moon Express (USA), Synergy Moon (International), Team Indus (India) and Hakuto (Japan).

Building Affordable Photodiode Spectrometer

Submitted By: 

Shalini Verma

Building affordable photodiode spectrometerWith a goal to develop an inexpensive spectrometer, bhickman on his website has designed and explained the process of making an affordable spectrometer. The resolution of the same is comparable to lower end commercially available spectrometers. Further, approximately 0.6 nm wavelength resolution is being provided by the current design and around 12-bit intensity resolution.

Generally, spectrometer should operate in the 400-900 nm wavelength range but to get the exact wavelengths, some changes are needed because of the discrepancies between the theoretical and actual design. Hence, a halogen bulb has been used as the light source and the design is accordingly modified to handle the heat generated. Further, some thoughts are required to find the way to eliminate higher order light interference.