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Voltage Logging

Steve Wright

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Mar 4, 2010
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great_britain
I read some where ( I think it was on here) someone selling a voltage logging device that connects to the battery and then you can use a smartphone to view the results !
I have looked on here but not able to find it so I wonder if anyone remember seeing it and can link me to it
 
I think Chris has,...............Chrissss
 
Chris has a Bluetooth monitor. Crispin I think posted a recent thread.
 
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One way of doing it is to get one of these usb sticks with the right type of input. You get them with temperature, humidity, voltage, and a few other types of inputs. This is often used when you don't need online continous data, but many of them can be used online as well. You first plug it into a computer and set the logging interval, unplug and connect to object, and it will go on logging until the battery is empty or the memory full, which could be a day or a year, according to settings.

Here's one that seems to fit the bill:
https://www.amazon.co.uk/Maplin-Vol...73542&sr=8-1&keywords=Voltage+USB+Data+Logger

Here is one example from a cheapo source - out of stock - but still, you get the idea:
http://www.dx.com/p/bside-bdv01-usb-dc-voltage-data-logger-black-blue-dc-0-30v-322555#.WHIYi4p95hE
Here's another one, similar function, and a bit ott: https://www.picotech.com/data-logger/drdaq/overview
Or ebbuy:
http://www.ebay.com/itm/Lascar-EL-U...30VDC-with-USB-Connectivity-New-/252420657379
 
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I have a cortex a20 based board ( cubie3 also called the cubietruck) with a bunch of sensors feeding it directly. But getting voltage has been a problem since its own reference is 5v. Been pondering a dedicated ADC to divide and feed an i2c bus.
 
GOK - If your board has a 0-5v ADC you can use a pair of resistors as a voltage divider to get the voltage into range for the hardware and then you just scale the result back up to the real value in code.
 
GOK - If your board has a 0-5v ADC you can use a pair of resistors as a voltage divider to get the voltage into range for the hardware and then you just scale the result back up to the real value in code.

Unfortunately this does not have an ADC on there. Would have made things simpler.
 
Says it requires 'Only' 6-24 MW :scared-eek: (Megawatts!) of power!
They must be trying to say it's low but would usually be in mA rather than watts or milliwatts.
 
Seem to be about £35 or thereabouts on eBay. Think I'd be inclined to add an inline fuse right at the battery + terminal.
 
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