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Kitronik Current Sensor Breakout Board (ACS711)

Measure currents from -25A to 25A with this board. It uses a Hall Effect sensor, which outputs an analogue signal which varies with the current detected.

Availability: In Stock.

Code1+ 10+
(£7.62 incl VAT)
(£6.84 incl VAT)

This circuit uses the ACS711 and can be used to measure currents ranging from -25A to 25A. The current you are measuring is routed into the pad labelled IP+ and back out of IP-. The board contains a range of hole sizes allowing for different gauge wires to be connected to the board. The IC then outputs the reading as an analogue signal between 0.3V and Vcc-0.3V to the OUT pin. When no current is drawn the output is at half the supply voltage, as the current draw increases the output moves further away from the centre point. If the device is operated from a 5V supply and is connected directly to a microcontroller analogue input (with a 10 bit resolution) then the resolution of the current reading will be 55mA.

The sensor works by utilising the Hall Effect so it must be kept away from strong magnets if it is to function correctly.

The board can easily be connected to a microcontroller and will operate at 3V or 5V.


  • Measures up to 25A current (in either direction).
  • Can be used with a microcontroller or an analogue circuit.


  • 1 x Current Sensor Breakout Board.

Possible applications include:

  • Digital current meter.
  • Motor stall detection.
  • Over load protection.


  • Length: 38mm.
  • Width: 28mm.
  • Height: 3mm.


  • Vcc: Supply Voltage (3 to7V)
  • OUT: Analogue Out (0.3V to Vcc-0.3V)
  • GND: Ground (0V)
  • FLT: Fault Pin
  • IP+: Current sensing pins + (-25 to 25A)
  • IP-: Current sensing pins - (-25 to 25A)



  • The maximum working voltage is 100V VAC peak or VDC.

This product is supplied in a bag.

Physical characteristics:

  • Length: 38mm.
  • Width: 28mm.
  • Height: 3mm.

Electrical characteristics:

  • Min supply voltage: 3.0V
  • Typical supply voltage: 3.3V
  • Max supply voltage: 7.0V
  • Typical current consumption: 4mA
  • Current measurement range: -25A to 25A
  • Typical sensitivity (over full scale): 55 mV/A
  • Max over current transient tolerance: 100A (single pulse for up to 100ms)
  • Normal Operating Ambient Temperature: -40C to 125C
  • Max Total Error: 4%


Posted by n pearson, Wednesday, 15 October 2014 on product Kitronik Current Sensor Breakout Board (ACS711)


do you thread the wire 'to be sensed' through the two IP holes, or cut the wire and solder to each hole. Bit confused as if the wire is to be soldered - could have done with being bigger pads ....? Thanks in advance


  • Posted by Aaron Sturman on Wednesday, 15 October 2014
    Hi, the current needs to pass through the IC so cut and one end soldered to "IP +" and one to "IP -". Thanks for the feedback on the pad sizes. I can see how with certain sizes of wire they might be tricky. The solder mask can be scratched off to reveal more copper to "enlarge" the pad if you're having difficulty. Please note that the maximum voltage you can run through the IC is 100V DC or 100V Peak AC

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