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16 Mar 2012


A modular device, NODE communicates with smartphones via Bluetooth. Bluetooth requires less energy than Wifi and can send information directly to your Bluetooth enabled device. With new Bluetooth Low Energy, NODE can communicate with iPhone 4S and some Android phones at up to 50 meters with even less energy than conventional Bluetooth. With multiple NODEs networked in your home or office, you can control the different devices by your location.

NODE: a modular, handheld powerhouse of sensors - [Link]

15 Mar 2012

dangerousprototypes.com writes:

Patrick Cambria posts this simple oscilloscope project using a Picaxe-08M microcontroller and a potentiometer. The Picaxe is programmed in BASIC and the entire MCU program follows:

goto main

The output from a potentiometer voltage divider is fed into an ADC pin of a PICAXE 08M then serially transmitted to a Serial Port in Visual Basic.NET and plotted over time in a line graph.

$5.00 simple oscilloscope using Picaxe and VB - [Link]

12 Mar 2012

  • Silicon Gamma Radiation Detector without GM tube
  • Gamma-ray or X-ray detector with PIN photodiode
  • When a Gamma-ray hits a depletion region on the PIN photodiode, it produces a small charge.
  • As known as Photoelectric effect or Compton effect.
  • The signal is generated as a pulse with amplifer.
  • Electron pair creation is needed 1.022MeV at least.
  • E value of Si is 3.65eV. When Si atom gets 3.65eV, Si puts out an electron.
  • Visible light have between 400nm to 800nm wavelength. Gamma ray have under 10pm wavelength.
  • Mainly Photoelectric effect under 60KeV, mainly Compton effect upper 60KeV
  • Mainly Electron pair creation upper 6MeV
  • Gamma energy of radionuclide have between 5keV to 4MeV. So rare electron pair creation without cosmic rays.
  • Cosmic ray have strong energy.
  • The lower energy come to high detection probability, the higher energy come to low detection probability.
  • The detection probability on 10keV is 100%, but 1% between 100KeV to 1MeV

Gamma spectroscopy - [Link]

12 Mar 2012

  • Silicon Gamma Radiation Detector without GM tube
  • Gamma-ray or X-ray detector with PIN photodiode
  • When a Gamma-ray hits a depletion region on the PIN photodiode, it produces a small charge.
  • As known as Photoelectric effect or Compton effect.
  • The signal is generated as a pulse with amplifier.

Silicon Gamma Radiation Detector - [Link]

11 Mar 2012

electronicsblog.net writes:

This is a very simple capacity tester. It consists of single resistor that discharges battery. Arduino measures the voltage drop across resistor. According to Ohm’s Law current = voltage/resistance. Every second value of current is divided by 3600 and summed up to get the capacity expressed in Ah (Amp per hour).

I have used two parallel connected resistors that total resistance is 6.9 ohm. Make sure that they have proper power rating, if you don’t want them to convert to smoke. If voltage across 6.9 ohm resistor is 3.7 V, then current – 0.54 A, power ~ 2W.

Arduino Lithium-ion battery capacity tester/discharge monitor - [Link]

10 Mar 2012

Light Meter @ Electric Projects – [via]

I was given a Yashica Mat-124G camera and you cannot get batteries for the light meter, so I decided to make one. I already had the analog meter and the small box, so the two were a natural fit. I also used Adobe Illustrator to make a new paper template and scale for the meter. This needs some work and I realize this is not actual lux levels.  The trick here is to come up with a scale useful to the camera I will be using it with.

Light Meter - [Link]

9 Mar 2012

The light weight, compact size and low cost DSA800 family of spectrum analyzers from Rigol Technologies feature digital IF technology to provide the reliability and performance necessary for RF applications. The spectrum analyzers have a frequency range of 9 kHz to 1.5 GHz with a typical displayed average noise level (DANL) of ‑135 dBm. SSB offset phase noise is typically -80 dBc/Hz at 10 kHz, and the resolution bandwidth is adjustable from 100 Hz to 1 MHz. A preamplifier and AM/FM demodulation are standard with this instrument. [via]

Low-Cost Spectrum Analysers Feature 1.5 GHz Top End - [Link]

9 Mar 2012

embedded-lab.com writes:

An LCR meter is an extremely useful device for measuring three basic impedance elements, namely, Inductance (L), Capacitance (C), and Resistance (R). Recently, I got a TENMA 72-8155 digital LCR meter from Newark for review. I was very excited to receive it as I didn’t have a dedicated LCR meter in my home lab. Here’s my quick review of this product.

TENMA 72-8155 digital LCR meter - [Link]

1 Mar 2012

HAMEG Instruments (a Rohde&Schwarz company) complements the successful HMO Series of DSO/MSO Oscilloscopes by also covering the lower bandwidth range of 70 to 200 MHz.

Recently, we introduced you new user-friendly oscilloscopes HAMEG, reach-featured already in a base version. They offer practically everything, what you can need at a usual work in development or repair, and who wishes to add functionality like I2C decoding or measuring of AC/DC currents, can do this by optional accessories. As we notified their supposed availability to this term, we already have them in stock and they are immediately available.

All types are MSO-ready – it suffices to connect a logic probe (option HO3508) in order to analyze 8 digital channels. With the known option HOO10 two freely selectable serial protocols of the types I2C, SPI and/or UART/RS-232 can be analyzed, hardware-supported and time-synchronous. This is possible both on the analog and the digital channels.

New is the option HOO11 which enable the analysis of these serial protocols on the analog channel. Even with the 2 channel instruments 3-wire buses such as SPI can be analyzed this way by making use of the external trigger input.(additional probe recommended)

Technical parameters:

  • 2 GSa/s Real Time
  • Low Noise Flash A/D Converter (Reference Class)
  • 2 MPts Memory, Memory zoom up to 50,000:1
  • MSO (Mixed Signal Opt. HO3508) with 8 Logic Channels
  • Serial Bus Trigger and Hardware accelerated Decode, I2C, SPI, UART/RS-232 (Opt. HOO10, HOO11)
  • 8 User definable Markers for easy Navigation
  • Pass/Fail Test based on Masks
  • Vertical Sensitivity 1 mV/div.
  • Offset Control ±0.2…±20 V (HMO20xx, HMO15xx)
  • 12 div. x-Axis Display Range, 20 div. y-Axis Display Range (VirtualScreen)
  • Trigger Modes: Slope, Video, Pulsewidth, Logic, Delayed, Event
  • Component Tester, 6 Digit Counter, Automeasurement, Formula Editor, Ratiocursor, FFT for Spectral Analysis
  • Crisp 16.5 cm (6.5”) TFT VGA Display, DVI Output
  • Lowest Noise Fan
  • 3 x USB for Mass Storage, Printer and Remote Control optional IEEE-488 (GPIB) or Ethernet/USB
  • Made in Germany

The HOO11 will be delivered with each HMO7xx, 10xx, 15xx, 20xx at no cost in the year of introduction.

New DSO Oscilloscopes from HAMEG - [Link]

28 Feb 2012

Sergei Bezrukov writes:

This project is based on Sensirion SHT15 humidity and temperature sensor. The sensor communicates with microcontroller by means of an I2C-like interface. Although this is a proprietary interface and not compatible with the standard I2C, it is very clearly described in the data-sheet.

I use the default 14-bit resolution for measuring the temperature and 12-bit resolution for humidity. The prototype also shows the atmosphere pressure sensor on the board and is an extension of the barometer project. This concerns usage of the pressure sensor, its interface with PIC, and communication with the LCD. The schematics below just shows the added parts to the barometer project.

Digital humidity meter - [Link]





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