You might have wished for something to warn you if you misspelled a word while writing a letter or doing a school assignment. Well, help with this is on the way!
A couple of German inventors, Daniel Kaesmacher and Falk Wolsky have developed a prototype of a pen that can warn you when you make a spelling mistake or when you do not write a letter correctly. Going by the name Lernstift, the pen starts to vibrate when the writer makes a mistake while writing out a word or letter. Lernstift is German Read more [...]
Your pet dog knows it has to “Fetch” the Frisbee you throw out and to “Sit” when you command it to do so. The dog knows this since it has been trained to learn some commands. As its association with you grows, so does its vocabulary. As the dog is an intelligent creature, it sometimes chooses to ignore your commands, depending on its mood.
Fortunately, the Raspberry Pi or RBPi does not have moods to ignore your commands. Not possessing any intelligence of its own, it faithfully obeys (or Read more [...]
A fan regulator is a crucial component that serves to increase or decrease the speed of your fan according to your needs. You have a choice between conventional and electronic regulators. The technology along with the circuitry that controls the fan speed is quite complex.
Older versions of conventional regulators were quite bulky to look at. A square box jutting out of a board with a circular knob or toggle switch did not make for very sleek appearance. The box contained Read more [...]
Industries are increasingly opting for low-power wireless photoelectric sensors with extended range of signals that carry for miles. Such improvements have been made possible with the proliferation of low-power micro-controllers that have boosted the range of the sensors and enhanced their battery life.
In general, wireless sensors conserve and extend battery life by switching themselves off when they are not taking measurements. This allows the sensor to spend most of its time not consuming any Read more [...]
Most touchless rotary sensors use a magnetic position marker for sensing position. The position marker is attached to the rotating part of the application. It also uses a sensor to measure the angle of the marker. The touch-less rotary sensor uses a magnetism-based technique and does not require physical contact between the marker and sensor. Although other noncontact magnetism-based sensors overcome the limitations of potentiometric sensors that use resistance-based track-and-wiper techniques, they 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 [...]
Want to learn more about power supplies and remote sensing? Here’s a comprehensive article about this subject from Andy – and don’t forget to Follow us on Google+:
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 [...]