|03-04-09, 03:04 PM||#1|
Join Date: Aug 2008
Location: 1000 Islands region, Ontario, Canada
Thanked 20 Times in 19 Posts
DIY household power use monitor / logger
Stumbled across this project - a home made logger of household power use (think: heavy duty killawatt that monitors the whole house instead of just one plug).
An AVR-based logging wattmeter
A strip chart showing power usage over time.
Our hot water heater uses over 4kW.
|03-04-09, 09:06 PM||#2|
Join Date: Oct 2008
Location: Austin, TX
Thanked 241 Times in 227 Posts
How about use hall effect sensors to sense the current? Then you don't need to integrate the signal and therefore get a higher accuracy. (The magnetic field around a wire is proportional to the current through the wire, but the voltage across a coil in a changing magnetic field is the derivative of the magnitude of the magnetic field with respect to time, so it would be necessary to integrate the voltage with respect to time to get the correct current for anything other than a sine wave. But the voltage output from a hall effect sensor is proportional to the magnetic field, so no integration is necessary.)
As for other improvements, maybe add an OpenWRT router to allow network access?
To my surprise, shortly after Naomi Wu gave me a bit of fame for making good use of solar power, Allie Moore got really jealous of her...