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20 Jun 2011

drzasiek.cba.pl writes:

XM-scope 3 – Miniature 2-channel digital oscilloscope for everyone.

This is already the third version of the digital oscilloscope for the AVR processor family. This time the machine is more complex, added a lot of interesting and useful features and above all, adding the device more practical applications.

The main goal of the project was to make a 2-channel oscilloscope with the smallest dimensions, with low hardware complexity, so that everyone can do it at home. An important role played by the cost of implementation and availability of parts.
About the unit

The heart device is a microcontroller ATXMega128A3-AU. The oscilloscope uses two built-in A / D converters of the microcontroller. The LCD display is a 132×176 pixel TFT driver L2F50 LS020 or the popular Siemensów S65/SX65/CX65 etc.

XM-scope 3 – Miniature 2-channel digital oscilloscope - [Link]

16 Jun 2011

ezflyer made a RS-485 network temperature sensor: [via]

This design will be used as part of my home automation system to measure temperatures in various parts of the house. I already have the wiring in place for an extensive RS-485 network, so the installation of the individual sensors will be easy. I’m currently working on a wireless version for my hot tub, and for an unattached workshop/garage.

This design is based on the PIC 16F648A processor, the MAX485 RS-485 interface IC, and the TC77 integrated temp. sensor. Each board has a (software) programmable network address, and network biasing (if required).

RS-485 network temperature sensor – [Link]

16 Jun 2011

Schematic and source for ITead’s programmable dummy load are now available. [via]

OverLoad source code release – [Link]

15 Jun 2011

PocketPico Picoammeter is a new, USB-connected; very low current measurement device for DC current from 20pA to 2mA. Tiny (2.7” × 1.4” × 3.7”), lightweight (8oz) PocketPico Picoammeter eliminates harmful switching spikes and reads at a rapid 15,000 samples per second. Perfect for lab test setups, PocketPico Picoammeter’s high accuracy, fast speed, and single measurement range brings new features previously unavailable in other picoammeters, like small size, single 20pA – 2mA measurement range at 15,000 Sa/s, high accuracy (±0.5%) and resolution (4½ digits), protection against voltage transients, etc.

PocketPico Picoammeter is dedicated to the task of measuring very low electrical current in optoelectronics, ion and electron beam monitoring, materials resistance testing and more. When connected to a PC, PocketPico Picoammeter accurately measures current from 20pA – 2mA and displays it using the free Windows-compatible easy-to-use PocketPicoReader software on the PC’s display.

PocketPico Picoammeter is one of the easiest and most affordable ways of measuring a wide range of extremely low current. Simple to integrate with existing lab tasks, it avoids using bulky equipment simply to take low power measurements, especially for field use. PocketPico Picoammeter could potentially save users thousands of dollars on instrument costs, software licenses and expensive data acquisition equipment.
Applications for PocketPico Picoammeter include: photodiode current and dark current measurement, ion beam monitoring and measurement, SEM and TEM beam current measurement, optical fiber alignment, component, sensor, and device I-V characterization, materials resistance testing, leakage current testing, analog and mixed-signal circuit testing & analysis, teaching labs, product demonstrations, etc.

Saelig’s New Tiny Picoammeter Eliminates Voltage Transients – [Link]

15 Jun 2011

blog.makezine.com writes:

Oscium’s iMSO-104 hardware offers to turn your iPhone, iPad, or iPod Touch into a 12MSPS digital oscilloscope with an analog bandwidth of 5MHz. For folks like me with limited desk space & shifting work environments, that’s an interesting offer indeed. Oscium sent over a test model to take for a spin, so onto the spinning!

iMSO-104 Oscilloscope for iPad & iPhone – [Link]

14 Jun 2011

adafruit.com writes:

A logic analyzer is a device that lets you watch digital signals in your electronics project. You can watch them real-time or log the data for later perusal. Unlike an oscilloscope, its not good for measuring analog signals – but also unlike an oscilloscope, you can track 8 signals at time! So its a good complementary tool. This logic analyzer plugs into a computer and has easy to use, cross-platform software. This makes it small, portable and inexpensive.

If you ever have to to debug SPI, i2c, serial, CAN, 1-wire, Manchester, biphase or other digital protocols, this tool is essential!

  • Speedy 24MHz

Logic samples each channel at up to 24M times per second. A large fraction of practical, real world applications run at less than 10MHz, and Logic is ideal for these.

  • 8 Channels

Logic has 8 inputs — it can monitor 8 different digital signals at once. For many modern microcontroller-based designs, this is plenty.

  • 10 billion samples

Logic can save as many as 10B samples, letting you capture even the most elusive events. No more dealing with frustratingly small sample buffers.

  • Comes complete

Start debugging within 5 minutes of opening your new Logic; everything is included: An ultra-flexible 22AWG 64/40 wire harness, 9 high-quality micro-hook probes, a USB cable (2 meter mini-B to A), and a nice carrying case. Download the software from our site (see software)

  • Enclosure

We love well made tools. That’s why we make Logic’s case out of custom CNC machined aluminum and make sure its anodized surface is finished to perfection.

  • Protection

Logic’s inputs are protected against overvoltage conditions via current-limiting resistors and ultra-low-capacitance diode clamps. A resettable fuse protects the USB ground return line to augment the USB host’s existing protection.

Saleae Logic – 8-Channel USB Logic Analyzer - [Link]

10 Jun 2011

Even upmarket digital multimeters with a built-in capacitance function are useless if you want to check out tiny capacitances, such as 2.7 pF or 5.6 pF. Usually the lowest measuring range is 2000 pF, which is a joke for RF designers and radio amateurs. Although the resolution of a 3.5-digit DMM resolution is 1 pF at this range setting, measurements below 200 pF or so yield results that are rough at best and ridiculous at worst. [via]

Please welcome ATtiny & The Low Picofarads – [Link]

10 Jun 2011

Wichit Sirichote writes:

This is my student assignment for the class “Designing Microprocessor Based Instrumentation”. The board demonstrates the use of 12-bit ADC, writing c program with digital filtering and interface the LED display. The reading provides 0.1C sensitivity. The optional input of the ADC is available for exercise with other input signals or sensors.

Thermistor Thermometer - [Link]

8 Jun 2011

Itead has a programmable dummy load kit. It’s open source, reuse it for that programmable power supply and load you’ve been putting off. [via]

Programmable dummy load – [Link]

8 Jun 2011

iTead has another dummy load on the way: [via]

Today we finished the OverLoad hardware finally design and now the first OverLoad dummy load is processing, and soon will back in stock.

By using the larger radiator and cooling fan, the OverLoad can work with 3A-12V without any pressure, in our aging test, it bear the 3.5A-14.5V for more than 3 hours and survived.

Another programmable dummy load – [Link]





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