acs712

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MatB
Hi,

I'm trying to interface my espruino with a ACS712 current detection board.

I have the board sat between a source and a load, and have connected the out pin to C5 on my espruino. When using
```
console.log(analogRead(c5));
```
I get lots of values like this:
```
0.49707789730
pin
C5
0.49732204165
pin
C5
0.49707789730
pin
C5
0.49634546425
pin
C5
0.49561303120
```
But the values remain largely the same irrespective of whether the load is attached or not. I have read a couple of tutorials about using this board for arduino (here and here) but they seem to indicate that I just need to find some coefficient to multiply the values I'm reading by.

Am I doing the right thing? Do I just have to find the "magic coefficient"?

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