New ACSP3 current/voltage sensor with dual interface

Hi guys,

I and Phil Kocmoud are proud to announce the new ACSP3 - current/voltage sensor with analog and I2C interface.

Here are some device features:

  • Vin max = 42VDC ( 10S )
  • Ishunt current = 90A
  • Vout = 5.4V
  • Ioutmax = 2.25A with 3A burst
  • Ultra low noise/ripple <10-12mV
  • Analog + I2C interface
  • Dimensions - 30x30mm

The new current/voltage sensor uses INA169 for analog current readings and dual I2C ADC for digital readings. The ultra low noise DC-DC Buck ( LT8609 ) makes the device one of the most silent. The board comes with 2x4 0.1" presoldered header.

A simple Arduino code attached showing an example of I2C voltage data readings.

Now we're performing the usual current/voltage stress tests and hope the device will be ready for the market very soon.

Some more pictures attached.

Best regards

Nick Arsov

Views: 2652

Comment by UAS_Pilot on June 17, 2015 at 7:07am

Looks good. 

Thanks for sharing.

Comment by Tsahi Mizrahi on June 17, 2015 at 8:37am

This is great,

Comment by Marc Dornan on June 17, 2015 at 10:21am

So Nick, this will be sending I2C readings to the FC instead of a scaled 0-5V (or 0-3.3V) analog reading?

Comment by Nick Arsov on June 17, 2015 at 10:27am

Hi Marc,

No, it has DUAL interface - analog ( 0-3.3V ) + digital ( I2C ). So, one can use either of them or both :-)

Comment by Marc Dornan on June 17, 2015 at 11:12am

I have a standing order with Phillip to get one of these as soon as they are available (just staking my claim at the head of the queue). So will firmware changes be needed to pass current and voltage readings to the Mini Hawk (that is what I call your PX4 variant)? I have only ever used analog inputs. And does this mean we do not have to calibrate those non-linear 3DR-style power modules. This looks great.

Comment by Nick Arsov on June 17, 2015 at 11:20am

Hi Marc,

The ACSP3 uses the same current sensor as the 3DR PowerBrick, then the signal is converted from an ADC into I2C. The software add-on should be a must. I'm not a software guy, but with all my limited skills in Arduino code, I read the ACSP3 I2C within a few hours. So I think this add-on code will be a piece of cake for the skilled software guys.

Comment by Artem on June 17, 2015 at 11:23am

Nick, can you make one rated at least to 180A  with triple BECs: 5.4v for FC, ans two adjustable 5-12v (as silent as possible). Preferrably in 45x45 form factor with a ESC power distribution. This would be a great option for larger hexas and octas as those spike 130-140 amps, even though they spent 95% of flight time in 30-50amp zone. Price range about  ~$45.

Comment by Nick Arsov on June 17, 2015 at 11:30am

Hi Artem,

Yes, I can, but not at that price. For such price you have to ask the Chinese guys :-)

Btw, such triple 150A BEC has been already designed by Airbotservices.com and will be announced very soon.

Comment by Nick Arsov on June 17, 2015 at 11:47am

...sorry, I did mean ....150A current sensor with triple low noise BEC....

Comment by Artem on June 17, 2015 at 12:42pm

Nick, Chinese do it for  $24 :) , they use the same shunt as in ATTO Pilot 90A, but since the price of the sensor is the same 90A and 180A it shouldn't translate in price increase if they were to do a 180A version. BTW, those $24 chinese current sensor/ DUAL bec/ power distro boards are rather safe to use, as I bench test all the power equipment I found that those boards are just barely warm to touch at 90A constant for 60seconds @6s lipo.  I do not have a higher rated  stationary current meter so couldn't really try it at higher Amps. And do not forget, that for $19 bucks one can get the old tried and true ATTO180A and there are plenty of rather noiseless BECs on pololu for under $5, Integrated solution will sure look cleaner, and for that people will pay extra 20-30 bucks even loosing flexibility in the process. And, do not forget, you gotta be competitive as well ;) 

best of luck Nick! 

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