Developer Comment by Randy on October 27, 2012 at 7:18pm

Ok, so I guess it's an alternative to the Atto (Otto?) current sensor which for some reason i'm unable to find in the diydrones store.

Comment by Nick Goodey on October 27, 2012 at 10:37pm

The output is just a voltage proportional to current so if that's what the Otto does then I suppose it is an alternative I am not familiar with the Atto (otto) 

Comment by Geoffrey Preston on October 28, 2012 at 7:09am

@ Randy

AttoPilot voltage and current sensor is available at Spakrfun

https://www.sparkfun.com/products/9028

  These hall effect sensors look like good alternative if you have a way to calibrate the output.

Comment by Nick Goodey on October 28, 2012 at 11:28am

I see its a shunt type sensor, so there is some energy used as heat in the resistor these devices.

The difference is that the raw output on the Raz is offset at arround half the supply voltage so you can add some analogue circuitry to null that out, or if do it in software.

One thing teh raw signal from the 100 A Raz is 0.01V per amp so with a 10 bit analogue input you would have around 0.5A resolution. As I say adding an analogue circuit to calibrate teh device to 0 to 5V for an Arduino would improve the resolution to around 0.1Amps

Test Data

Comment by Yuan Gao on October 28, 2012 at 12:03pm

What about Allegro MicroSystem's Hall effect current sensors?

I use them a lot and they're not that expensive, about $7 from Digikey

Comment by Nick Goodey on October 28, 2012 at 2:37pm

Nice

will take a look I only used these because I had them is stock from an old project

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