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Author Topic: Voltmeter via ethernet for a hydroturbine  (Read 526 times)
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Hello all,
I'm looking for a way to monitor the voltage of a battery that is connected to a hydro turbine and send the results to a local network website.
I can do the website and coding part but have no idea on how and what I do need in terms of electronics to set this up.

Does anyone have an idea?

Thanks
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Shannon Member
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I'd have a look at the Nanode - its the sort of setup needed, an Arduino-a-like and
ethernet controller used to monitor power.

http://www.nanode.eu/
An Arduino and an ethernet shield can do the same thing.
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What is the maximum output voltage of the hydroturbine? 
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But I'm only planning on checking the battery voltage, so it's a range from 10v to 14v...
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You might use ~13 diodes in series (.7v drop each) to reduce the battery voltage to a point where it can be input to an arduino analog input pin. There are a number of ways to display the arduino analog pin values in a web page.

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I recommend use of a voltage divider to measure the battery voltage, as this will be easier to calibrate than when using diodes. Here is a tutorial: http://forums.trossenrobotics.com/tutorials/how-to-diy-128/cheap-battery-monitor-using-resistive-voltage-divider-3264/
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Adjustable voltage dividers.

http://www.ebay.com/itm/10pcs-10K-Ohm-B10K-Knurled-Shaft-Linear-Rotary-Taper-Potentiometer-A865-/121191682904?pt=LH_DefaultDomain_0&hash=item1c37965358
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You might use ~13 diodes in series (.7v drop each) to reduce the battery voltage to a point where it can be input to an arduino analog input pin. There are a number of ways to display the arduino analog pin values in a web page.

But that doesn't actually work because an input pin draws no current until the
protection diode starts coducting at 5.4V or so.  Diodes only have a roughly
constant voltage drop when there is a definite constant current flowing, but
its temperature sensitive so you'd need a temp-sensor too.

Voltage divider is simple, reliable, drift-free, cheaper.
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