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22 Mar 2012

Zener diode is a special diode, unlike normal diodes zener diodes are intended to work in the breakdown voltage. These components maintain constant voltage at its terminals. This is a circuit to help you find out what’s the breakdown voltage of your diodes.

  • Read  Vz  value of zener diode in Led display
  • Zener diode tester range: 1V to 50V
  • Two scales 5mA and 15mA test

Zener diode tester 1V to 50V - [Link]

21 Mar 2012

Steve @ semifluid.com writes:

Using the PIC18F2550 GLCD Text Test as a basis for further experimentation, I put together a simple and accurate graphical oscilloscope using a PIC18F2550 microcontroller and a AGM1264F graphical LCD. The oscilloscope measures the average voltage, the maximum voltage, the minimum voltage, the peak-to-peak voltage, and the zero-crossing frequency for a DC signal over 100 samples. The oscilloscope has a built in edge trigger function that can be set to capture on rise or fall (or disabled altogether). The time scale for the display is variable and can be easily redefined using the changeTimeDivision function. Likewise, the voltage range can be change to 0-5V, 0-2.5V, and 0-1.25V. The main limitations of this oscilloscope include relatively slow acquisition time and sampling rate (~60kHz) and the fact that the inputs are limited by the constraints of the internal ADC. However, it is a very nice display and I highly suggest you view the videos to see it in action.

PIC18F2550 KS0108 Graphical LCD Oscilloscope - [Link]

21 Mar 2012

Ivan Sergeev writes:

The battery-powered Levitating Digital Scale electromagnetically levitates a load platform, and uses a linear hall-effect sensor to measure the magnetic field strength to determine the weight of the platform. The levitating platform is embedded with a permanent magnet that opposes the magnetic field of a solenoid (the electromagnet). When a load is placed on the platform, the levitating platform will settle to a new height. Since the magnetic field created by the electromagnet is held constant, the linear hall-effect sensor experiences a stronger magnetic field due to the closer permanent magnet platform. Therefore, the reading on the linear hall-effect sensor increases, and can be correlated with the added weight on the scale.

Levitating Digital Scale - [Link]

17 Mar 2012

 

The i-voltmeter is an electronic testing tool that can:

  • Diagnose electronic functions of anything you need to test
  • Data log electronic events over time
  • Remote view events with your smart phone
  • Create Remote Triggers
  • Set Alarms
  • Use as an anti-theft device
  • Measure electrical voltage, current & resistance

Now you can test a full spectrum of electronics with the diagnosis and data logging features of the iV. Other units cost upwards to $1000. Because it is Bluetooth enabled, you can unleash yourself from the testing device with the iV.

i-voltmeter – Voltmeter with Bluetooth Technology - [Link]


16 Mar 2012

electronicsblog.net writes:

Today I will show how to make digital bridge between Arduino and PC: control analog – digital converter and send measured data to PC. Windows application will be created using Visual C++ 2008 Express.

Voltmeter demo software is very simple, and here is a lot room for improvement, but I just wanted to show basics how to control com port and execute data exchange between PC and Arduino.

Digital voltmeter – Arduino and PC (Visual C++) – [Link]

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:

main:
READADC10 1,B0
SERTXD(#B0,10)
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]



 
 
 

 

 

 

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