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Topic: Voltmeter via ethernet for a hydroturbine (Read 589 times) previous topic - next topic

lguenier

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

MarkT

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.
[ I won't respond to messages, use the forum please ]

zoomkat

What is the maximum output voltage of the hydroturbine? 
Consider the daffodil. And while you're doing that, I'll be over here, looking through your stuff.   8)

lguenier

But I'm only planning on checking the battery voltage, so it's a range from 10v to 14v...

zoomkat

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.

Consider the daffodil. And while you're doing that, I'll be over here, looking through your stuff.   8)

jremington

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/
"It seems to run on some form of electricity"

zoomkat

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
Consider the daffodil. And while you're doing that, I'll be over here, looking through your stuff.   8)

MarkT


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.
[ I won't respond to messages, use the forum please ]

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