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23 Nov 2011

circuitvalley.com writes:

This is 60 MHz frequency meter / counter for measuring frequency from 10 Hz to 60 MHz with 10 Hz resolution.It is a very useful bench test equipment for testing and finding out the frequency of various devices with unknown frequency such as oscillators, radio receivers, transmitters, function generators, crystals, etc. The meter provides very stable readings and has excellent input sensitivity thanks to on board amplifier and TTL converter, so it can even measure weak signals from crystal oscillators. With the addition of prescaller it is possible to measure the frequency of 1GHz and above.

60 Mhz Frequency Meter / counter - [Link]

22 Nov 2011

jumperone.com writes:

My parents growing their own organic food and they asked me to deal with winter temperatures problem in the storage room. It gets really cold here, in Ukraine. Some winters have even lower temperatures than -30°C (-22°F). So right now I designing a simple thermostat for keeping temperature at about 5-7 degrees C above zero. Plus right now I started to use my garage as a gym, so this thermostat would be handy there too.

It’s based around ATMEL AVR ATtiny2313 microcontroller, it will measure temperature using DS18B20 digital temperature sensor, and it has a 30A 240VAC relay to control heater.

ATtiny2313 – Based Thermostat Project - [Part1]+[Part2]+[Part3]

22 Nov 2011

circuitvalley.com writes:

More and more experiments are now ‘PC-assisted.’ Also conventional acquisition systems are very expensive. Since portable PCs are today common and a USB link is a better solutionhere we present an oscilloscope using USB port of the PC that operates at up to 10 kHz with ±16V input voltage. It has much more improved features than the PC-based oscilloscope . The oscilloscope uses IC PIC18F2550 from Microchip as the main controller, which makes the oscilloscope compact as there is no need of additional power supply for the entire circuit board.

Two-Channel PC Based Oscilloscope USB - [Link]

21 Nov 2011

At purchase of any HAMEG digital storage oscilloscope from 7xx,10xx,15xx to 20xx series within this year, you wil gain the serial bus analysis option with a value of 190 EUR for free.

Together with a lot of useful functions which new HAMEG HMO digital storage oscilloscopes feature, HAMEG Instruments (a Rohde&Schwarz company) offers an extra bonus. At purchase of any of the above-mentioned oscilloscopes until the end of year 2011, you will gain the option 2011 for free – a license key enabling to analyse I2C, SPI a UART/RS-232 serial bus. Thanks to this function you can save a lot effort at development or service of devices, which use these communication protocols.

The option HO011 uses analog inputs and the trigger input, thus it isn´t necessary to buy any external logical sond. It offers a real time hardware accelerated decode. Values are displayed colour coded for intuitive analysis and an easy overview. Up to 4 lines are displayed for a comfortable display of decoded values. Decoding is into ASCII, bináry, hexadecimal or decimal format. HO011 also features a powerful trigger to isolate specific messages. You can download the HMO user manual, where you can find the detailed description of serial bus analysing on pages 37-41.

Analyse I2C, SPI and UART/RS-232 for free! - [Link]


9 Nov 2011

Whether itʼs software engineers and their compilers or electrical engineers and their oscilloscopes, engineers and makers of all kinds rely on tools to build great things every day.  We depend on tools so much that we often take our ability to use them for granted.  The NerdKits team was contacted by a blind mechanical engineering student, and combined technologies from two earlier projects to produce a set of talking digital calipers that turn a distance measurement into an audible readout.  The video includes a clip where Terry explains his passion for engineering and shows how he uses the talking calipers in his job and classes, so be sure to take a look.

Talking Digital Calipers for Engineering Accessibility - [Link]

5 Nov 2011

With the MS2102 clamp multimeter you can comfortably measure not only alternate but also a direct current and voltage and all this at an outstanding price.

If you´re considering a purchase of a clamp multimeter, or if you already have a common multimeter and want a clamp version, then we have the device with an outstanding ratio of price to performance for you.

Sometimes it isn´t a problem to disconnect a measured circuit and to measure current by a common multimeter connected in series. However you may have already experienced a situation when it wasn´t possible to disconnect the measured circuit, from mechanical or electrical reasons. For these situations a clamp multimeter is an ideal choice. As it is well known, the biggest advantage of clamp multimeters is that they are able to measure a current flowing by a wire lead on the base of an induced magnetic field – without direct connection to a measured circuit. Thanks to the fact that a current is measured indirectly – the multimeter is at measuring galvanically isolated from a measured circuit, what provides a significantly higher safety to the user. From the principle of construction is the clamp multimeter suitable for measuring of mid to higher currents (above approx. 10 mA)

A big advantage of MS2102 is that it enables to measure also a direct current (DC). So for example to measure a current flowing to or from a car battery is with this device a breeze. Concurrently with measuring AC and DC current offers MS2102 also a possibility to measure also an AC and DC voltage, resistance to 400 Ohm and a continuity test. It contains an analogue bargraph and a maximal display value is 3999.

Measure even a direct current with the clamp multimeter MS2102 - [Link]

31 Oct 2011

This circuit is a digital sound level meter with a LCD screen, capable of displaying 80 characters (4 rows with 20 characters on each). You can build this LCD display. It also provides more debugging information, such as the minimum and maximum analog-to-digital samples that were measured during each period. [via]

Digital Sound Level Meter - [Link]

27 Oct 2011

redferret.net writes:

For most of us, the threat of radiation poisoning is not something we often think of. However, there is always the possibility that some catastrophic incident will put some of us in danger. Now, I don’t know about you, but I can’t recall the last time I’ve seen my Geiger counter. So how do you tell if the area is unsafe? As it turns out, you can use your iPhone.

Don’t get me wrong, you really shouldn’t trust your phone as a completely reliable source of information regarding radiation levels. However, in a pinch, it can tell you enough to let you know if there is a danger. You see, the CMOS sensor doesn’t just record the light visible to your own eye, it can also capture Gamma and X waves emitted by radioactive sources. With the WikiSensor Dosimeter, you just cover the iPhone’s front camera with black tape, and run the program. The black tape prevents any light from traditional sources from being captured, yet still lets though the waves mentioned above. If these waves are recorded, then the software will let you know, and give you an idea of the risk. If you live in an area where you might be exposed to radiation at some point, this might be worth the $.99 price.

WikiSensor turns your iPhone into a Geiger counter - [Link]

26 Oct 2011

Arduino BiCMOS Curve Tracer – [via]

The curves above can be done with a Arduino board, a solderless breadboard, a dual Rail to Rail Input/Output Op amp, a few resistors and capacitors, and some free software. The graphs above are produced by either Scilab or Octave. The curves are also viewed when using the Processing application.

Arduino BiCMOS Curve Tracer - [Link]

26 Oct 2011

Big Mess o’ Wires » Backwoods Logger – Open Source and On Sale – [via]

The Backwoods Logger is a programmable graphing altimeter / thermometer, developed and documented here at Big Mess o’ Wires. Today is a big day for the Logger: I’m re-launching it as a formal open hardware project, and also offering a small test run of pre-assembled Backwoods Logger Mini units for sale. After corresponding with many enthusiastic people over the past months, I’m convinced there’s a community of Logger-heads out there that’s bigger than just me. My goal is to bring together people who are merely curious about the Backwoods Logger, or are interested in buying a prebuilt Logger, or have already built their own Logger, or are interested in making improvements to the existing Logger software and hardware.

Backwoods Logger - [Link]



 
 
 

 

 

 

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