kWh data logger circuit?

[Maxcot]

I'm looking for a DIY kit to build a data logger than records kWh consumption... not having much luck. I know the devices are available commercially, but I'm interested in putting one together myself. Any pointers?
Thanks.

 

[tpetar]

Check this project:

 

[Maxcot]

Check this project:

? I don't see anything.....?!?!?

---------- Post added at 14:28 ---------- Previous post was at 14:27 ----------

Ahhh, sorry... took a while for the attachment to appear. Apologies.

 

[tpetar]

I hope so that you dont have that lag in your future logger.

 

[Maxcot]

I hope so that you dont have that lag in your future logger.

Hells teeth, me too

I've got a question on winding a toroidal coil for the sensor element... A toroid of approx ext 35mm diam, with 100 turns of enamelled wire.... how important is it to have the turns wound neatly, and tightly against each other? Does it matter if they are overlapping each other in an ad-hoc way.

 

[tpetar]

Its current transformers CT.

 

[Maxcot]

Its current transformers CT.

? I don't understand the comment...

Yes, it's a CT...

 

[Maxcot]

Check this project:

I'm looking for some info around the distance constraints between sensor and micro-controller. If I had the sensor component (a toroid type current transformer) located about 20m away from the "reading" component, would it work? My design at present aims to provide 1.1v on the sensor output, and the connection between sensor and micro-controller is regular cat-5 cable.

 

[tpetar]

Of course you should put signal amplifier its obvious, or convert analog to digital and transfer over long distance.