An SMPS application using PIC16F785 from Microchip. [via]
In this application note, we will examine a typical buck topology intelligent SMPS design using the PIC16F785.
The design presented here shows an alternative single-chip approach to adding intelligence to SMPS designs. The basic design is really unchanged. There are current and voltage feedback loops, a counter-based PWM is used to generate the reference voltage to the voltage loop, and the microcontroller uses the reference voltage to modify the operation of the system in response to conditions sensed through the ADC.
App note: Switching power supply design with the PIC16F785 – [Link]
Maxwell Technologies have announced the addition of a 2.85 Volt, 3400-Farad cell to their K2 family of ultracapacitors. It is the most powerful cell available in the industry-standard 60 mm cylindrical form factor. Incorporating Maxwell’s DuraBlue™ Advanced Shock and Vibration technology it also claims to be the most ruggedized cell currently available making it suitable for high energy storage in demanding environments such as those typically encountered in public transit vehicles and transport applications.
3400 Farad Ultracapacitor – [Link]
by Shawon Shahryiar @ embedded-lab.com:
Okay firstly the reason I wrote about the clock system instead of I/O ports or something else in this second post of the XMega series is simply because of the fact that without understanding clock configurations you won’t get what you want from your chip. Since XMega’s clock system is software-level configurable and complex at first, it makes itself the first priority module before anything else.
XMega Clock System – [Link]
Colin Jeffrey @ gizmag.com writes:
In a conventional camera lens, the iris consists of a set of overlapping mechanical blades that control the amount of light entering the camera. As efficient as this mechanical system is, it is too bulky and too difficult to miniaturize to be incorporated in smartphones and other compact devices. To address this, a team of researchers has used “smart glass” to create a micro-sized electronic iris that may bring much greater image quality and flexibility to smartphone cameras.
“Smart glass” iris could bring greater quality and flexibility to smartphone cameras – [Link]
by prem_ranjan @ open-electronics.org:
We have designed an Oscilloscope using PC and Arduino Board. The signal is first of all fed to the Arduino Board where the analog signal is converted to a digital signal by the ADC which is then serially outputted to the PC and is read by the MATLAB software via the COM ports. Here the signal is read in the form of digital data but then is converted to analog one by using the resolution of the ADC used by the Arduino Board. The MATLAB software was then used to plot the signals.
A PC and an Arduino: here’s your DIY Oscilloscope – [Link]
Dave teardown 3 classic analog multimeters:
EEVblog #634 – Analog Multimeter Teardowns – [Link]
w2aew @ youtube.com writes:
This video presents a simple automatic audio volume leveling circuit. The application that prompted this is a police/fire/emergency scanner. Often times, different services will have different volumes in the receiver – so adjusting for a comfortable listening level on one service/station will often lead to other services being too loud or too quiet. This circuit will automatically adjust the volume of each received signal based on the signal’s peak amplitude. Similar circuits have been widely published, so there’s really nothing new here – just a quick tutorial and demonstration of how this circuit works. An arrangement of capacitors and diodes are used to implement a peak detector to measure the input signal amplitude. The dynamic impedance of diodes is controlled/changed to adjust the signal level. The result is a leveling circuit that has a very wide input dynamic range with a near constant average output level.
Circuit fun: Automatic audio leveling circuit – [Link]
by Ryan Roderick, Intersil @ edn.com:
The fundamentals to translating the analog world into the digital domain reduces to a handful of basic parameters. Voltage, current, and frequency are electrical parameters that describe most of the analog world. Current measurements are used to monitor many different parameters, with one of them being power to a load.
There are many choices of sensing elements to measure current to a load. The choices of current sensing elements can be sorted by applications as well as the magnitude of the current measured. This write up is part one of a three part series that discusses different types of current sensing elements. The focus of this paper is evaluating current measurements using a shunt (sense) resistor. The paper explains how to choose a sense resistor, discuss the inaccuracies associated with the sensing element and the paper discusses extraneous parameters that compromises the overall measurement.
Sensing Elements for Current Measurements – [Link]
With components from Belden, Hirschmann, Lumberg automation and other brands of company Belden group you´ll solve any challenge in industrial automation.
If you work with sensors, signals and a data transfer in industry in general, then you´re probably familiar with brands like Belden, Hirschmann and Lumberg automation. It´s a less known fact, that all these brands (and other) belong to company Belden group.
We mention all this mainly because some components from Belden group could be found in our portfolio already for some time. As an authorized distributor of Belden we enlarged our cooperation even more and enhanced our offer with another products.
In the Belden group portfolio can be found solutions for:
● industrial networking
● industrial connectivity
● cables and cable assemblies
● machine control (MCS – machine control solutions)
● broadcasting and AV, and many other …
From the point of view of producers of various industrial devices are very interesting industrial connectors, i.e. mechanically very stable and reliable connectors with IP rating for transmission of signals from sensors and also in an opposite way – for controlling (driving) of various actuators. It can be said, that they´re „internationally standardized” and widely used , whether in round versions – so called „sensor connectors“(IEC 61076-2-xxx) of various sizes (M8, M12, M20, …) or rectangular – „valve connectors “ according to DIN EN 175 301-803.
Universal connectors usable for power supply, control and data transmission are another very interesting group of components. Here belong for example CA series connectors.
In many cases it´s more convenient and simpler to use ready-made cables with a connector, often hermetically sealed, providing the highest protection against harsh environment and pollution. Cables are available with a PVC or PUR insulation, and also a welding sparks resistant PUR. Cables are available with one connector (the other end is free, suitable for soldering in or insertion into a connector) and also with connectors on both sided (the same or different types). Also available are cables with an approval for usage in a food industry.
For all cases, when several connectors should be interconnected on one place, are suitable so called distribution boxes (I/O modules) with a various count of connectors (ports).
Another interesting group are components for „Industrial Ethernet“. Here can be found for example Ethernet switch, RJ45/M12 adapters and various interconnecting cables.
In respect to a huge amount of versions and series, we recommend you to have a look at the „Belden Industrial Connecting solutions” catalogue, where you can find particular products comprehensively sorted by given groups. Solutions for other segments can be found on http://www.beldensolutions.com website.
Belden group are more than just cables – [Link]
Anticipating the need for secure communications for the next level of device connectivity Microchip have integrated a complete hardware crypto engine into their PIC24F family of microcontrollers. Computers normally use software routines to carry out data encryption number crunching but for low power microcontrollers this method will generally use up too much of the processor’s resources and be too slow.
Microchip have integrated several security features into the PIC24F family of microcontrollers (identified by their ‘GB2’ suffix) to protect embedded data. The fully featured hardware crypto engine supports the AES, DES and 3DES standards to reduce software overheads, lower power consumption and enable faster throughput. A Random Number Generator is also implemented which can be used to create random keys for data encryption, decryption and authentication to provide a high level of security. For additional protection the One-Time-Programmable (OTP) key storage prevents the encryption key from being read or overwritten.
Microchip PICs with Integrated Crypto Engine – [Link]