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7 Feb 2012

circuitvalley.com writes:

This is a simple application of internal 10-bit ADC (analog to digital converter) of MSP430G2231 microcontroller.you can use this circuit to measure up to 30 Vdc. the possible applications are on bench top power supply or as a panel meter in various system.

TEXAS INSTRUMENTS MSP430G2231 is the heart and brain of this circuit .the internal adc of the mcu with a resistor network voltage divider is used to measure the input voltage . then 3 digest of comm anode 7 segment display is used to display final converted voltage. as you can see in the schematic the displays are multiplexed with each other . means we switch on one display and put the corresponding digit on this while other two displays are off this cycle go for each of the display.

MSP430 based 30V voltmeter - [Link]

7 Feb 2012

www.simpleavr.com writes:

This is a simple rf spectrum analyzer project based on TI Launchpad. i have been working on other rf transceiver projects and in need of a simple rf spectrum analyzer to help me visualize what’s happening.

This is a linux project, i had given attention with my best knowledge to make provisions so that it can be built under windows. however i do not have the time and resources to try out everything under windows.

I did successfully built and run the project under windows 7 w/ TI CCS IDE, for host visualization script, it also works under windows but required you to install some unixish packages (cygwin and more)

I need something simple to show the pattern of frequency hopping. i do not need very accurate display of rf power. the Launchpad came in handy as it is inexpensive and contains fast ADC functions. the included usb to uart is a plus as i can communicate data between the MCU application w/ a PC side application for visualization. there are around a dozen or so commands that you can issue via SPI to control the RFM12B, as well as sending and receiving data.

RFM12B Spectrum Analyzer - [Link]

5 Feb 2012

dangerousprototypes.com writes:

Arhi made use of his precision LCR meter to measure capacitance and ESR values of ceramic, tantalum, and electrolytic capacitors. He made his measurements at various frequencies to help him graph the changes to the values over a wide frequency range.

From the graph it can be extrapolated that the ceramic capacitors have the lowest ESR values at any frequency up to the measured 100KHz. While the tantalum capacitors seem to be the most stable of the group.

Ceramic, tantalum, and electrolytic capacitor comparison - [Link]

4 Feb 2012

coremelt.net writes:

With this tool you can test various electronic components like diodes, LEDs, all kinds of transistors (PNP, NPN, several types of MOSFETs), capacitors, resistors as well as triacs and thyristors. It will show you several physical characteristics after the test was completed, like forward voltages, (gate) capacity and amplification factor. More over, it will show the polarity of the component and identifies the several pins of a package. A very nice and sophisticated project I host for Markus Frejek. I’ve done an additional layout for the device you can see on the left side. This project has found a lot of fans, including myself. The device is powered by an AVR ATmega 8 MCU.

Component tester - [Link]


3 Feb 2012

Here is an interesting electronics gadget. It’s a semiconductor component tester that displays the type, pinout, and some relevant specifications of the device connected to its probes. [via]

It doesn’t matter how you connect the test clips to the component, the Atlas DCA can analyse a vast number of different component types including bipolar transistors, enhancement mode MOSFETs, depletion mode MOSFETs, Junction FETs (only gate pin identified), low power thyristors and triacs (less than 5mA trigger and hold), diodes, multiple diode networks, LEDs, bi-colour and tri-colour LEDs. It will even identify special component features such as diode protection and shunt resistors in transistors.

Semiconductor analyser determines part type and value - [Link]

3 Feb 2012

dangerousprototypes.com writes:

Zipppys123 is building a DIY ultrasonic range finder based on this design. Once it’s externally triggered a PIC12C508 is used to generate generate the ultrasonic pulse, and measure its echo.

The ultrasonic pulse is amplified using a MAX232 TTL-to-RS-232 level converter, while the echo is amplified and demodulated using two op-amps and comparators.

DIY ultrasonic range finder - [Link]

2 Feb 2012

Ejberg.dk has developed this project for a simple ATtiny2313 based servo tester – [via]

Ejberg.dk has developed this project for a simple ATtiny2313 based servo tester.

This device lets you test servos by varying the pulse width between limits of 0.8000 ms and 2.2000 ms selectable through the use of four buttons.

While the schematic shows an Atmel AT90S2313, the circuit will work with the popular ATtiny2313 using version 2.05 of the code downloadable from the ejberg site. He also has another version of this tester known as the ServoTester2 which uses the ATmega16P.

ATtiny2313 based servo tester - [Link]

2 Feb 2012

Charalampos Andrianakis writes:

When i was using operational amplifiers at school lab i wanted a function generator at home to play with and work on circuits with Op Amps for better understanding. So i found on the internet a free function generator circuit which uses the IC XR-2206, i printed the PCB with my UV epxosure box, i bought an enclosure box, i put everyhting inside and here is the result.

The function generator can generate Square, TTL, Sine and Triangle waveforms from 1Hz to ~1Mhz with Voltage regulation to Square Sine and Triangle waveforms.

XR-2206 Function Generator - [Link]

2 Feb 2012

Charalampos Andrianakis writes:

Autonomous live tracking weather station. It takes (analog/digital) measurements and sends them to a web server over GPRS. Adding a battery and a solar station you can make it fully autonomous. It supports up to 3 Analog or Digital inputs. The main brain is the PIC 16F877A which also drives the SIM900/300 GSM module which is placed in the back of the PCB.
The main purpose of this project is to take wind flow measurements of different locations and store them in a database remotely. By this you know if the locations are appropriate for future installation of wind generators.

The data send from GSM to Web server with GET requests which isn’t the safest and best way but its an easy way to make it work. The example code you can find at the github is a very simple example and has no security responsibility.

GSM/GPRS Autonomous Weather Station (Tracking System) - [Link]

2 Feb 2012

A mini Logic Analyzer wich has 4 inputs, it’s portable (55×65 mm), battery powered and at the moment can capture data upto 100kHz. Vassilis Serasidis writes:

This mini Logic analyzer is a tool for you to watch on LCD the logic transitions 0 or 1 of a digital data signal. A digital data signal can be found on the output pin of TSOP-1730 Infrared Receiver, on the Transmit and reveive pins of MAX-232 chip (RS-232), on Clock and Data pins of I2C data bus and many more electronic components. This circuit is so far limited upto 100 kHz digital signals but this will be changed with a future firmware update.

4-input mini Logic Analyzer - [Link]



 
 
 

 

 

 

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