rooster1
Posts: 17
Joined: Tue Feb 12, 2013 8:55 pm

current clamp meters

Thu May 09, 2013 9:23 am

Hi

There was some discussion some time ago about reading domestic electricity meters with a Pi and the best solution seemed to be counting the LED flashes using a photoresistor.

In the case of older meters, it seems we need to use a current clamp http://www.powermeterstore.com/p8578/efergy_xl.php which outputs a 50Hz voltage (of 0- few volts) which is in someway related to the 50Hz current.

The clamp has a jack and I was wondering whether this could be plugged into the audio jack of the Pi and read rather than used as a speaker?

Failing that would need an AD converter - any recommendations?

Thanks

R

User avatar
DeeJay
Posts: 2027
Joined: Tue Jan 01, 2013 9:33 pm
Location: East Midlands, UK

Re: current clamp meters

Thu May 09, 2013 9:34 am

rooster1 wrote:I was wondering whether this could be plugged into the audio jack of the Pi and read rather than used as a speaker?
The 3.5mm audio jack on the RPi is an output not an input.
How To Ask Questions The Smart Way: http://www.catb.org/~esr/faqs/smart-questions.html
How to Report Bugs Effectively: http://www.chiark.greenend.org.uk/~sgtatham/bugs.html

User avatar
mahjongg
Forum Moderator
Forum Moderator
Posts: 13379
Joined: Sun Mar 11, 2012 12:19 am
Location: South Holland, The Netherlands

Re: current clamp meters

Thu May 09, 2013 1:57 pm

there is some progress in using the PI's (revision 2) I2S audio interface, so perhaps in the near future it will be possible to have audio-in on the PI.

Return to “Automation, sensing and robotics”