I have connected my
power counter to my gateway's serial port (RS232, 7E1) and I retrieve
its data stream. Given that I pay for electricity once per month, I got
1 file per year. This system allows me to track my power consumption.
By this way, I get daily/mensually/yearly rating. At the end, I have
some nice graphs
As of 2011, this project has been restarted with a different approach. The project is hosted by EMG-BOX
A small (30x60 mm) digital RPM meter for my Peugeot 205 Diesel (or any other vehicle). Designed with Eagle
- AVR programmer (schematics & pcb & bom): here
- RPM meter (schematics & pcb & bom): here
- firmware for RPM meter (source & binary): here
The RPM meter has been published in the Elektor Magazine (French edition, juillet/aout 2008).
Note: programmer schematic is based on Mike Perks' page
programmer firmware is taken from Klaus Leidinger's page
with AVR Studio 4.
I have some other projects in the while: power supply, electronic load and an UPS.
As of August the 13th 2009, I added atomic time synchronization (DCF-77) to my server. Schematic of such a device can be found on the Jurgen Beisert's homepage
But, this simplistic receiver may not work in poor reception conditions. This is the reason why I develop an active antenna
. This active antenna uses a better ferrite rod (higher quality factor ~70) than provided with the module. The rod is tuned on 77.5 kHz frequency station
and 2 transistors are used to amplify low level signal.
This antenna can be located anywhere thanks to a differential transceiver connected to 2-pairs RJ45 cable.
A second module
is used to plug RJ45 cable and set levels to RS-232 standard.
You can look at pictures here