What’s inside Gossen Metrawatt’s Metrahit Energy Multimeter?
Gossen Metrahit Energy Multimeter Teardown - [Link]
Here’s Big Mess o’ Wires simple pressure and temperature demo: [via]
I described an idea for a hiking data analyzer based around an old cell phone LCD, a pressure/temperature chip, and an ATmega microcontroller. Since then, I’ve received the parts and built a simple demo that exercises everything. It’s not very exciting yet, but it demonstrates that all the parts are working as expected, so now the real work can begin.
In the photo, clockwise from the upper-left, you can see the ATmega, LED used for debugging, Nokia 5110 LCD, Bosch BMP085 pressure/temperature sensor, and the ISP programming cable. The BMP085 is mounted upside-down, since direct light on the sensor can skew its measurements. A small 3.3v power supply is to the left of the board, not visible.
Pressure and temperature sensor demo – [Link]
Squonk has some useful links if you want to build your own scope: [via]
- A nice HDL example of an oscilloscope using a FIFO and trigger
- A 100 MHz input stage
- A firmware development/improvement for the DSO “Welec 2000a- series”
- The (sad) story about the DSO Quad portable scope (why sad?)
DIY oscilloscope – [Link]
This project is one of many others I had made to control my house with rules, web interface, logger and many more. This one is a weather station that reports almost anything about the external environment. I bought mechanical part of the wind sensor at http://www.aag.com.mx/indexaag.html I had to remove all the electronics that came with it and replace them with my own.
Weather Station – [Link]
Here is my new Frequency meter who was done with a LCD’s cellular phone!!! This is a simple project. The Frequency is passing through an op-amp to convert it in a square wave. The ouput of the op-amp is feeding the 3*8 bits counter (24 bits) who can accumulate at a maximum of 16777216 count.
Frequency Meter – [Link]
The iDVM digital multimeter from Redfish Instruments Inc. wirelessly connects to an iPhone, iPad, or iPod Touch to enable users to acquire, visualise and share measurement data on their Apple devices. Unlike conventional multimeters, the iDVM does not have its own display or controls, but instead piggybacks on the iPod, iPad or iPod Touch screen with the aid of a special app. According to Redfish, this novel approach provides instrument users with a familiar user interface that allows them to interact with electronic test and measurement tools in a previously impossible manner. [via]
Multimeter module links to iPhone or iPad – [Link]
emonTx stands for Energy Monitoring Transmitter. It’s a small, open source wireless energy monitoring node. It’s based on the Arduino (Atmega328) and is fully compatible with the Arduino IDE and programmed via an FTDI to USB cable.
It’s designed to take inputs from multiple CT sensors, optically from a pulse-output utility meter and from multiple one-wire temperature sensors, and interface via RF with the Nanode which then makes the data available over the Internet. The emonTx is designed to be powered by 2x AA batteries or 5V USB. [via]
Openenergymonitor – [Link]
In this video, we’re demonstrating how to measure component signatures using a digital storage oscilloscope, signal generator, and a solderless breadboard.
How to Use an Oscilloscope and Signal Generator as a Component Tester / Curve Tracer – [Link]
blog.saleae.com writes: [via]
Woo Hoo! Logic16 is finally released. It has been a long time coming. The main bottleneck was the new 1.1.x software, and making that rock solid, but it was also plenty tricky on its own – in particular the analog front end. Analog 101 all over again, plenty of spice simulation, at least 5 or 6 board revs, a fairly high end Agilent scope and $1000 active probe. There’s things we could have done to make it a lot easier in retrospect, but part of the goal was to learn how we could design front ends for much higher end stuff. We now at least know what the right questions are, and I’m confident that we’ll be able to pull off some really nice stuff for the 3rd/4th products.
New Saleae 16bit logic analyzer released – [Link]