[TriEmbed] Question: On/Off Sensor for Hot Water Heater

[Glen Smith]

You can also use either a clamp on (split) or pass through (disconnect,
pass wire through sensor and reconnect) transformer to measure. Sparkfun
has a 30A clamp on here: https://www.sparkfun.com/products/11005

I also have a bookmark for an ElecFreaks Octopus version (pass through) but
the link
http://www.elecfreaks.com/store/octopus-noninvasive-ac-current-sensor-ta1703-brick-p-648.html
appears to be broken. I found info in their wiki about it here:
http://www.elecfreaks.com/wiki/index.php?title=Octopus_Non-invasive_AC_current_sensor_%28TA12-100%29_Brick

These get placed around one AC hot wire and depending on the current draw,
a voltage is induced that can be measured by a micro controller.

Glen

On Wed, Jan 14, 2015 at 2:15 PM, Dwight Morgan <dwight.w.morgan at gmail.com>
wrote:

> Hello All:
>
>
>
> I want to monitor when my hot water heater is on and off using my Arduino
> UNO. I have done research on sensors and it looks like the best choice is
> the ACS712 Hall Effect Current Sensor.
>
>
>
> My water heater has two 4500 Watt elements at 240 Volts. So the calculated
> current draw is 18.75 amps since only one element is on at a time.
>
> My question(s): First, is the Hall Effect sensor a good choice and second,
> if so, will the 20 amp rated one work okay?
>
>
>
> Also, if this is viable, I think I will try to use Cat5 cable to pick up
> the signal which will be about 100 feet away. I’m not sure exactly about
> the connectors yet.
>
>
>
> All advice is appreciated.
>
>
>
> Thanks!
>
>
>
> Dwight
>
>
>
>
>
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