Open source extra-sensitive high resolution TED receiver

Previously on the bloggy blog, I posted a few of my projects related to home data acquisition and to The Energy Detective (TED), a whole-house power measurement device. I made a set of homebrew wireless temperature sensors that display graphs on a digital picture frame, I reverse engineered the TED protocol, built a small self-contained open source TED receiver, and used that design to make a nifty clock. So, I wanted to take the next step and set... Read More

The Kilowatt Clock

I thought I’d try putting together a YouTube video to show my latest crazy project. As usual, the schematic and firmware is in Subversion.  Read More

Self-contained TED receiver

My previous entry introduced a homebrew receiver for the powerline-based data protocol used by The Energy Detective. I just designed a second revision of that receiver. This one is self-contained: It gets power and modulated data from a 9V AC wall-wart transformer, and decoded data leaves via an RS-232 serial port at 9600 baud. Best of all the circuit is very simple: Just an 8-pin microcontroller and a single op-amp. Major changes in this version: DC... Read More

Interfacing with The Energy Detective

I recently bought The Energy Detective (TED), a pretty inexpensive and friendly way to keep tabs on your whole house’s electricity usage. It’s a lot like having a more featureful version of your utility company’s power meter, sitting on your kitchen counter. It can estimate your utility bill, and tell you how much electricity and money you’re using in real-time. The resolution is pretty good- 10 watts, 1 second. As a product,... Read More

Measuring energy usage

Lately I’ve been interested in measuring whole-house power consumption. I’d like to know where my electric bill is going, how often I forget to turn the lights off, how much the CFL bulbs are actually helping, etc. Besides, I really like measuring things in real-time and displaying them in interesting ways So, I’ve been pondering various ways to do this. Our house has a mechanical power meter out front, so I considered building... Read More