ACS712 current measuring

Hello everyone

I´ve got my new ACS712 chip (like: http://tinyurl.com/a6g9lfg )

I´ve hooked some power consumption appliance through the screw terminal. Hooked 5V for the VCC and Ground til GND. I´ve putted my meter (VDC) to the GND and OUT on the board. (The LED on the board is power on)

The problem is i´ve only got 2,416 VDC out, even if I took the appliance out of the circuit, and there is no consumption.

Have I missed something ??

StenKrog: Hello everyone

I´ve got my new ACS712 chip (like: http://tinyurl.com/a6g9lfg )

I´ve hooked some power consumption appliance through the screw terminal. Hooked 5V for the VCC and Ground til GND. I´ve putted my meter (VDC) to the GND and OUT on the board. (The LED on the board is power on)

The problem is i´ve only got 2,416 VDC out, even if I took the appliance out of the circuit, and there is no consumption.

Have I missed something ??

Yes, the device can measure current flowing in either direction as it does in AC circuits. So they set 'zero current flowing' in the middle of the DC output voltage range (nominally +2.5vdc) and measurement DC voltage increases from that as current increases in one direction and the DC output voltage will decrease from +2.5vdc as current flow increases in the opposite direction. The datasheet for the device should explain all that and the proper scaling value of DC output voltage Vs AC current value.

http://www.sparkfun.com/datasheets/BreakoutBoards/0712.pdf

Lefty