ACSP3 – current and voltage sensor

Nick Arsov, the developer of the AUAV-X2 autopilot, presented some time ago his new current and voltage sensor – the ACSP3. As I needed a power distribution board for my new SG Acro v1.1 quadcopter, I decided to give it a try.


  • Max Input Voltage (Vin) = 42V; So possibility of use a 10S LiPo battery.
  • I-shunt = 90A; You will be able to measure current up to 90A.
  • Vout = 5.3V; Great if your ESCs have no integrated BEC and you need to power the FC.
  • Iout = 2.25A; Enough to power your flight controller, receiver, GPS and so on.
  • Ultra low noise: <10mV
  • Analog interface
  • I2C interface; works great with my Arduino Uno.
  • Dimensions: 30x30mm. Mounting holes: 22.5×22.5mm.
  • 8x male headers pre-soldered.
  • Weight: 4.4g


  • Voltage and current sensor for AMP, Pixhawk, AUAV-X2 and all PX4 based flight controllers.
  • Distribution and power board for every 5V tolerant flight controller (Naze32, KK2.1.5, CC3D). You don’t need ESCs with integrated BEC or separate BEC.



I soldered a male XT60 connector to it and then integrated the ACSP3 into my SG Acro quadcopter.

Using the I2C interface with Arduino Uno: download the code. It is slightly updated by me, because the final version of the ACSP3 is rated for 10S and not for 6S as the beta. Upload the file to your Arduino and connect all four wires from the I2C interface as described in the code. Using the Serial Port you can check the current and voltage.

You can use it straight away with your AUAV-X2 flight controller. If you have Pixhawk, you need to modify the cable to fit in the Pixhawk voltage/sensor port. Not sure if it is possible to order such one from Nick´s webshop.

The quality of the ACSP3 is great, but the price is in my opinion high: 29$ plus shipping. If you just want to power your flight controller, you can go for a simple BEC. For those of you who need cheaper voltage and current sensor for Pixhawk, use this power module.

But If you are planning to build an expensive copter for work, then you definitely need the reliability of the ACSP3.

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