Most electrical appliances have an electric motor that rotates to displace an object from its initial position. Various motors are available in the market such as servomotors, induction motors, stepper motors, DC motors (both brushless and brushed), etc. The choice of a motor depends on the requirements of an application. Most new designs favor brushless DC motors, also referred to as BLDC motors.
The working principle of brushless DC motors is similar to that of brushed DC motors, but their construction Read more [...]
Technologists researching at the laboratories of the National University of Singapore in the department of Electrical and Computer Engineering have developed a new technology that will help in enhancing storing information in electronic systems in a better and more durable manner. Called Magneto Resistive Random Access Technology, this innovative method increases the storage space considerably and ensures that all fresh data will remain intact, even when there is a power failure. The team of researchers, Read more [...]
Power supply manufacturers need to test their products dynamically. Instead of using fixed-resistor banks of different sizes, electronic loads allow them to simulate easily and quickly various power states. Using an electronic load, large ranges of power sources such as converters, inverters, UPSs and electromechanical sources such as batteries and fuel cells may be tested. For varying loads, electronic loads are easier to use and provide a much higher throughput compared to fixed-resistors.
For Read more [...]
Planning to go on a vacation, but afraid of who will look after your home for you? Worry not, for the mighty Raspberry Pi (RBPi) is here. Not only will RBPi look after your entire house, it will send you an email of what is happening in your home and let you see it on your mobile or on a PC. How cool is that?
Most alarm systems incorporate three primary sensors. The first is a temperature sensor to detect the rise in temperature in case of a fire. The second is an intrusion detection sensor to Read more [...]
An approaching thunderstorm creates a very stuffy environment with oppressively heavy moisture in the air. The presence of water in the air is termed as humidity and this largely affects human comfort. The amount of water vapor influences many physical, chemical and biological processes. In industries, measuring and controlling humidity is critical since it can affect not only the health and safety of personnel, it can affect the business cost of the product as well.
Sleep apnea leads to repeated Read more [...]
Your calculator probably has a darkish colored panel just above the display. The panel is made up of solar cells that power up your calculator if there is enough light. You may also have seen some solar panels, which people use for charging up their cell phones. Earlier, these solar cells or photovoltaic cells were exclusively used to power the electrical systems of satellites. However, they are now commonly used in less exotic ways as well.
How do photovoltaic cells convert light to electricity? Read more [...]
You might have noticed, the Raspberry Pi (RBPi) does not have any inputs for reading analog signals, unlike the PIC, AVR or the Arduino micro-controllers. This is because the RBPi is a digital only computer. Since many sensors generate only analog signals, it would be nice to make the RBPi analog-friendly by giving it some analog inputs.
Letting RBPi acquire some analog inputs is easy if you use the MCP3008 chip from Microchip. Since the RBPi does not have a built-in Analog to Digital Converter Read more [...]
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BJTs, FETs and MOSFETs are all active semiconductor devices, also known as transistors. BJT is the acronym for Bipolar Junction Transistor, FET stands for Field Effect Transistor and MOSFET is Metal Oxide Semiconductor Field Effect Transistor. All three have several subtypes, and unlike passive semiconductor devices such as diodes, active semiconductor devices allow a greater degree of control over their functioning.
Depending on their subtypes, operating frequency, current, voltage and power Read more [...]
The HVAC devices in your home, typically the air-conditioner, thermostats, heating and ventilation, use one or more remote handheld devices working on Infrared (IR) technology. As the HVAC devices are from different manufacturers, you will most likely own a multitude of remote devices, making it difficult to handle and set each of them independently.
However, with the Raspberry Pi or RBPi, a small board called the IR Remote Shield and a wireless interface, you can control all the HVAC devices Read more [...]