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27 Nov 2011


Designing a simple and cheap temperature logger @ Pick and Place blog… Some time ago, I was looking for a temperature logger. After checking what was available on the market and the prices, I decided to make one myself.

Designing a simple and cheap temperature logger – [Link]

24 Nov 2011

“ColorHug”… [via]

For the past 3 weeks I’ve been working long nights on an open source colorimeter called the ColorHug. This is hardware that measures the colors shown on the screen and creates a color profile. Existing hardware is proprietary and 100% closed, and my hardware has a GPL bootloader, GPL firmware image and GPL hardware schematics and PCBs. It’s faster than the proprietary hardware, and more importantly a lot cheaper.

Making hardware does cost money, and I can’t give the hardware away for free like I do my other software. I’m aiming to do an initial production run of 50 units, but I’m going to need some advanced orders just to make sure I don’t get stuck with a lot of stock and no buyers. I’m offering a 20% discount on each unit, on the assumption the first users will be testing the firmware and reporting problems. If you want to support a cool open source project, I’m asking £48 for each unit, plus postage and packaging. There’s a whole website http://www.hughski.com if you want to know more about the project, and there’s even an newsletter if you don’t need hardware, but want to know how we’ re getting on.

“ColorHug”… - [Link]

23 Nov 2011

circuitvalley.com writes:

This is General purpose Temperature meter for measuring Temperature from -55 ºC to 150 ºC ..It is a very useful bench test equipment for testing and finding out the temperature of various devices with unknown temperature such as room temperature , cpu cabinet, etc. The meter provides very stable readings and has excellent input sensitivity thanks to LM 35 Temperature sensor from National Semiconductor , so it can even measure small temperature change.

The LM35 is three terminal temperature sensor which gives output in the form of analog voltage. LM35 linear to the whole temperature range it generate 10 mV/ºC. this analog voltage is feed to the internal 10 bit analog to digital convertor of the PIC 18F458 which convert it into temperature and then display to the NOKIA 3315/3310 LCD.

Nokia 3315 LCD Based Temperature Meter - [Link]

23 Nov 2011

circuitvalley.com writes:

This is very accurate home made LC inductance/capacitance meter built with very common components which are very easy to find all around . The range of this LC Meter is extremely good at measuring very low value of capacitance and inductance.

LC Meter’s Inductance Measurement Ranges:

  • 10nH – 1000nH
  • 1uH – 1000uH
  • 1mH – 100mH

LC Meter’s Capacitance Measurement Ranges:

  • 0.1pF – 1000pF
  • 1nF – 900nF

Very Accurate LC inductance / Capacitance Meter - [Link]

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]





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