Computers available today come with only one or two USB sockets. With the multitude of USB or Universal Serial Bus devices we use today, it is easy to run out of sockets. For example, you may have to connect your mouse, keyboard, printer, webcam and microphone, all operating on USB technology, to your computer. With only two ports available, it is obviously a difficult task.
However, there is an easy solution. You can use an inexpensive hub. According to the USB standard, which also covers USB Read more [...]
Carrying your radio along is nothing new, since a small and portable radio set is readily available. However, there is a different charm in carrying your single board computer with you while it is playing software-defined radio, and this is exactly what Miller Jacobson did with his Raspberry Pi (RBPi). There are two aspects to this project, the hardware and the software. While the software is simple enough, the hardware is somewhat involved.
To carry your RBPi around means to free it from the Read more [...]
Can you imagine using a rollerball pen and paper to create a fully functional circuit? That day is almost here. The Circuit Scribe works just like a regular ballpoint pen except that it is filled with a special non-toxic conductive silver ink that creates functional hand drawn circuits. The special conductive ink dries instantly.
The Circuit Scribe will be a great tool for people who feel overwhelmed with learning about using an actual circuit board. It will also be a great tool for experienced 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 [...]
Many of you may be garden enthusiasts and would welcome the idea of automating some of the maintenance requirements of your plants. For example, keeping tabs on the quantity of water that is required by the plants based on the moisture in the soil, the available sunlight and the environmental temperature might be easy for an experienced gardener. However, gardeners who have just started gardening find it a difficult equation to balance. Even an experienced gardener may have to depend on a novice 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 [...]
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 [...]
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 [...]
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 [...]