by mjlorton @ youtube.com
In this video I explain how a spectrum analyser (Tektronix MDO3000) can be used to view signals in the frequency domain vs an oscilloscope’s time domain.
I give an overview of the logarithmic scale and its benefits vs a linear scale.
I explain how compound wave forms like square and triangle are made up of harmonics.
I do a practical demonstration of how the spectrum analyser works with some example signals. I then show how this can also be done on an oscilloscope using the FFT (fast Fourier transform) maths function.
Spectrum Analyzer, Scope and FFT looking at Signals - [Link]
by PeterHaban @ makechronicles.com:
I made a water level sensor a little while a go to measure the water level in my underground rainwater harvesting tank. Thanks to the Jubilee I found time to finally setup the first part of my Arduino/Xbee wireless sensor network and the first sensor node was also meant to read from this water level sensor. I was somewhat surprised when it only returned 0s so I went and had a closer look. How the slug got into the enclosure is still a mystery to me… but looking at the bright side (after the uncontrolled swearing) I now had a reason to build a much better water level sensor
Measuring a water tank level - [Link]
A DIY dynamic electronic load by Jay_Diddy_B over at EEVblog Forum:
The dynamic load steps the load current so that the transient response of the power supply being tested can be observed.
0-5A maximum continuous current
0-5A pulsed current at 330Hz
DIY dynamic electronic load - [Link]
by Joe @ hobbyelectronics.net:
This project was built to monitor the temperature of one of our computer rooms at work that has rather temperamental air-conditioning. The maximum temperature can be set, and if this is exceeded an alarm is activated.The unit gives a continuous display of current temperature and it’s possible for the constructor to change the device program firmware or display board.
LED display Over Temperature Alarm - [Link]
by tnkrmnz @ instructables.com:
Edison-Scope, is an Intel Edison controlled 200 Msa/S mixed signal oscilloscope. It provides an Operating System agnostic method to control the MSO-28 oscilloscope. By leveraging the web browser on the modern smart devices, one can control USB based hardware traditionally requires a desktop OS. Conceptually this project is very similar to the PiMSO project, but the similarity exist only on the client side. The server side was rewritten using Node.js. Node.js provided a more device independent solution to the server side of the WebMSO project.
Intel Edison Oscilloscope - [Link]
by Nurgak @ github.com:
To measure my electricity usage I decided to build a small system that would count LED blinks on my power meter which indicate the used Wh. It was pretty straight forward system requiring an Internet connected microcontroller to log the data and some sort of sensor that would detect LED blinks on the power meter which is not my property and thus not accessible or modifiable.
The main reason to do this project is to get a better overview of the electricity usage as the house is heated by a heat pump so basically everything works on electricity or other free (thermal solar collector) and renewable sources (stove).
I had a CC3200 development kit laying around, it’s featuring a chip with Wi-Fi and an ARM Cortex-M4 processor running at 80MHz, it was more than enough to fill all the needs of this project.
Electricity usage monitor - [Link]
Rohde & Schwarz designed the new 200 MHz models of the R&S RTM oscilloscope especially for universities and educational institutions. The education mode was developed for test and measurement practica and makes it possible to disable all analysis tools (e.g. Autoset and QuickMeas) and automatic measurements. This improves the learning effect as students and learners have to calculate measurement results on their own. The mode is password-protected and available for the other bandwidth models of the R&S RTM family as well.
The R&S RTM is also ideal for general T&M applications in development, manufacturing and service. Using the R&S RTM-B200, -B201 and -B202 bandwidth upgrade options, the 200 MHz models can grow with future requirements and be expanded to 500 MHz. The new R&S RTM-K32 digital voltmeter option enables the R&S RTM to measure various values such as AC, DC, peak and crest factor with three-digit accuracy regardless of the oscilloscope’s triggering. A seven-digit frequency counter has also been integrated into the scope.
200 MHz bandwidth, education mode, digital voltmeter and frequency counter added to R&S RTM bench oscilloscope - [Link]
The idea behind this project is connect some sensors to the Raspberry Pi and put the information available on demand via Twitter requests and put sensor history data online on the web.
To do that, I used a DHT22 temperature and humidity sensor connected to the Rasberry Pi.
Sending weather data via Twitter using Rasbperry Pi and DHT22 - [Link]
by Husham Samir @ instructables.com:
A temperature data logger, is a portable measurement device that is able to recording temperature over a defined period of time automatically. The data can be retrieved and viewed after it has been recorded. In this device the temperature will record every one minutes in CSV file.
Temperature Data Logger - [Link]
Davide Gironi published a new project an AVR ATmega328 based CO2, temperature and humidity logger and meter:
It logs data feed, CO2 in air in terms of ppm, temperature and humidity to a xively.com feed.
It also display realtime data to user through a 16×2 characters LCD.
This logger it is based on the xively logger you can found here
CO2 meter and Xively logger with NDIR infrared sensor built on AVR ATmega328 - [Link]