<html><body><span style="font-family:Verdana; color:#000000; font-size:10pt;"><div>Greets,<br></div><div><br></div><div>I would suggest that you use a fairly low resistance resistor and place it in the B- wire, then measure the voltage drop across that and calculate the current from our dear friend Ohm's Law.</div><div><br></div><div>If you are currently supplying 0.333 amps, I'd suggest you find a precision 1 Ohm resistor. The voltage across the resistor would then be exactly equal to the current, via the equation V = I x R. You could then measure that with a DVM and see the current in real time, as you do whatever it is you're doing.<br></div><div>--<br>Julie Haugh<br>Senior Design Engineer<br>greenHouse Computers, LLC // jfh at <a href="http://greenhousepc.com">greenhousepc.com</a> // greenHousePC on Skype</div><div><br><br></div>
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-------- Original Message --------<br>
Subject: [Voyage-linux] Any Hardware Voltage Monitoring/Usage Sensors<br>
Available for ALIX boards?<br>
From: linux123 <<a href="mailto:24bits@comcast.net">24bits@comcast.net</a>><br>
Date: Sun, January 22, 2012 3:15 pm<br>
To: <a href="mailto:voyage-linux@voyage.hk">voyage-linux@voyage.hk</a><br>
<br>
Hello,<br>
<br>
I am using Voyage Linux MPD Version: 0.8 (Build Date 20111030) with an Alix<br>
2D2 board for my music server which connects to an Ayre QB9 external USB<br>
DAC. I was wondering if there are any ways to view/ monitor actual power<br>
usage of the ALIX board via software based sensors included with this Linux<br>
distribution or thru add ons? I saw that there were some basic Temp sensors<br>
available but nothing about power usage..etc<br>
<br>
My primary reason for seeking this information is that I am powering my Alix<br>
board with a laboratory grade benchtop linear power supply that is variable<br>
from 0-30v. At the moment I am feeding it a little over 15.5v & .33mA but<br>
can't tell how much of that power it is actually using without breaking out<br>
a volt meter/clamp. Its not the end of the world if I have to do it this way<br>
but thought it would be much easier if it could be done via software<br>
instead. My goal is to feed the board exactly what it needs to run and<br>
supply power for the USB port and not a spark more as to keep electrical<br>
noise/interference to a minimum.<br>
<br>
Thanks for your time and any info you can provide.<br>
<br>
--<br>
View this message in context: <a href="http://voyage-linux.34677.n3.nabble.com/Any-Hardware-Voltage-Monitoring-Usage-Sensors-Available-for-ALIX-boards-tp3680043p3680043.html">http://voyage-linux.34677.n3.nabble.com/Any-Hardware-Voltage-Monitoring-Usage-Sensors-Available-for-ALIX-boards-tp3680043p3680043.html</a><br>
Sent from the Voyage Linux mailing list archive at <a href="http://Nabble.com">Nabble.com</a>.<br>
<br>
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