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Forum Index : Microcontroller and PC projects : Power Monitoring.

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Phil23
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Joined: 27/03/2016
Location: Australia
Posts: 1664
Posted: 12:45pm 21 Apr 2017
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Still don't have any power monitoring going on my heat pump conversion.

Just stumbled across these, Energy Monitor Module with Serial TTL.




Looks like it does away with the need for calculations from the other type sensors, with Voltage, Current, Power & Energy usage all sent out in the serial data string.

Haven't found a data sheet yet, but there's some relevant info on Github.

Looks like it could be a really useful module for anyone wanting power monitoring without the alternate hardware & code overhead.

Cheers

Phil.
 
Phil23
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Joined: 27/03/2016
Location: Australia
Posts: 1664
Posted: 12:56pm 21 Apr 2017
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Data Sheet here.
 
TassyJim

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Joined: 07/08/2011
Location: Australia
Posts: 5913
Posted: 03:47pm 21 Apr 2017
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It's good to have the data sheet.

The module could be handy.
I normally don't trust ebay quality mains connected devices but it looks like the serial is opto-isolated so that makes me a bit more willing to try it.

Jim

Edit:
ON further research, I found a good description of some of the hazards with this board.
https://forum.arduino.cc/index.php?topic=435594.0

The photos attached to the message are worth looking at, especially this one.
https://forum.arduino.cc/index.php?action=dlattach;topic=435594.0;attach=187170
Edited by TassyJim 2017-04-23
VK7JH
MMedit   MMBasic Help
 
centrex

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Joined: 13/11/2011
Location: Australia
Posts: 320
Posted: 04:59pm 21 Apr 2017
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http://www.ebay.com/itm/100A-Electric-monitor-communication-module-power-energy-current-meter-CT-coil-AC/311568778074?_t rksid=p2045573.c100033.m2042&_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D41375%26meid%3D354e6511076a473188 0b1f183edeaaf2%26pid%3D100033%26rk%3D3%26rkt%3D8%26sd%3D111343306786

If this works have a look at how not to connect to 240 volt power at the bottom of the page.
Cliff
 
TassyJim

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Joined: 07/08/2011
Location: Australia
Posts: 5913
Posted: 05:06pm 21 Apr 2017
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I did see that lovely test setup. You wouldn't want to sneeze.
VK7JH
MMedit   MMBasic Help
 
Phil23
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Joined: 27/03/2016
Location: Australia
Posts: 1664
Posted: 11:10pm 21 Apr 2017
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  TassyJim said  Edit:
ON further research, I found a good description of some of the hazards with this board.
https://forum.arduino.cc/index.php?topic=435594.0

The photos attached to the message are worth looking at, especially this one.
https://forum.arduino.cc/index.php?action=dlattach;topic=435594.0;attach=187170


Yes Jim,

I did read that very same post about 1/2 an hour after clicking Buy it now & spending my $9.21.

At that point Telstra decided I needed a "Break" for the day.

Phil.
 
Phil23
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Joined: 27/03/2016
Location: Australia
Posts: 1664
Posted: 11:21pm 21 Apr 2017
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  TassyJim said   I did see that lovely test setup. You wouldn't want to sneeze.


Banana plug friendly power board.....

Companion to the, crocodile clips on the 240V lead?
 
Phil23
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Joined: 27/03/2016
Location: Australia
Posts: 1664
Posted: 01:24pm 22 Apr 2017
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Got a couple of plug in cheapies here with large displays, $20.00 at the junk shop.

Pulled them apart yesterday to resolve the "Rain" issue.
It was interesting to see the screen/keypad connections with their SPI markings.




Saw this page earlier in the day, Reverse engineered power meter.

And this.

Don't understand SPI enough to make use of the information, but could it be a useful option to break out of a complete monitor unit.

Phil.
 
mikeb

Senior Member

Joined: 10/04/2016
Location: Australia
Posts: 173
Posted: 05:20pm 23 Apr 2017
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The Asian's have a sense of humour when it comes to novel things to connect to the mains supply. Especially when it comes to 'creepage' clearances.
Looking at that X2 capacitor I can just picture the power supply schematic in my head. Capacitive reactance is not my idea of isolation.
Reminds me of the poor girl that bought an iPhone charger, off eBay, and got her head fried while listening to music through headphones.
No mention of 'power factor' measurement in the specs so I guess it can only represent apparent power.

Pass.....................

@Phil,

'Hot Snot' has many uses. At least they bothered.

Regards, Mike B.
There are 10 kinds of people in the world.
Those that understand binary and those that don't.
 
crez

Senior Member

Joined: 24/10/2012
Location: Australia
Posts: 152
Posted: 01:06am 25 Apr 2017
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I have a monitoring system for total mains power drain/feed based on a maximite. The voltage is monitored via a small mains transformer. The current is measured using a hall sensor in a gapped core around the main conductor. The instantaneous voltage is measured then the current is measured 20ms later, which relies on the voltage not changing much from cycle to cycle. The two values are multiplied to get the instantaneous power. The power is measured at 20 points in the cycle and then averaged.
You can use these samples to measure power factor and real and reactive power. The power can be negative or positive depending on solar grid feed and local consumption.
 
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