Tag Archives: power distribution board

ACSP3 – Current, voltage sensor and power board

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. Here some data.
  • 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.


ACSP3 BackACSP3 Front

I soldered a male XT60 connector (for use with all my 1300mAh LiPos) to it and then integrated the ACSP3 into the acro quadcopter.

ACSP3 XT60SG Acro v1.1 Weight

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 a Pixhawk controller, 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 a bit high: 29$ plus shipping from here for USA. If you want just to power your flight controller on an small quad, you can go for a simple BEC. For those of you who need cheaper voltage and current sensor for you 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.

Power distribution board vs. Cable harness

When I started with the Multicopters in the late 2012, I used cable harness/power breakout cable  for the power distribution from the battery to the ESCs in my first quadrocopter. Until last month I always used my self-made cable harness in my copters. There were no problems during the flights and everything was just great.

Last month I decided to buy one from these so called power distribution boards. Just because of the weight and it looks a bit better when there are not so many cables. My goal was to safe some grams and optimize the overall weight of my SG Adventure quadcopter. It is a small quad and every gram matters.

Soldering was a bit tricky, because I left the ESCs mounted on the quad and I am not so good at soldering. In general there is no difference, but it looks better for me now. The quadcopter flies great, as it was with the cable harness.

How many grams do I saved?

Cable harness and the 3.5mm gold connectors, that I cut from the ESCs wires: 28g + 12g = 40g.       Power distribution board + 4mm gold connectors to the battery + some tin-alloy: 3.5g + 10g = about 15g. So I saved about 25g, which is not much, but for small copters every saved gram means more flight time.

Another cool feature on this flyingfolk board is, that it is possible to solder other low current components such as LED or Voltage-Sensor on the corners.