Discussions

Developer

Using ATTO sensor and the new APM Power Module connection

Posted by Bill Bonney on December 12, 2012 at 3:15pm

I am powering my APM with two batteries, one for the outputs and one for the inputs. So I don't require the APM Power Module to power my board, but I would like to add V & I sensing for the the main power.

Question is, has anybody wired an ATTO sensor to the Power Management port? What issues will I run into?

From looking at the eagle files the APM PM port is on ADC 12/13 not ADC 1/2. Is that still V & I respectively?

The divider network is 1.5K to 13.7k in the APM PM unit and 1K to 15.7K in the ATTO 90A? Is that correct?

The AMP current sensing is fed into an OpAmp with a 73.2k (atto) vs 110K on APM PM. What's the range for the APM PM vs the ATTO (3.3v)

 

Maybe the best solution is to buy the APM PM unit and disconnect the power line? 

 

Thanks for any help and advice :)

 

 

You need to be a member of diydrones to add comments!

Join diydrones

Tags: atto, management, power
Email me when people reply –
Follow

Replies

  • Mohamed Saleh June 5, 2014 at 3:43am

    Hi Bill,

    I have a similar problem regarding powering my APM2.5 with 6S LIPO.

    I was wondering if you could help me with this issue as i am a bit confused.

    many peaople mention using ATTOPILOT sensors.

    why do people suggest the ATTOPILOT as a solution for this issue,

    isn't it just a voltage and current monitor module and not a converter?

    instead i found that i need somehow a DC regulator such as 

    the adjustable DC/DC power converter (1.25V -35V/3A)

    http://www.antratek.com/adjustable-dc-dc-power-converter-1-25v-35v-3a

    can you kindly confirm if my understanding is correct! or if i am missing something here :)

    Cheers,

    Mohamed

  • Developer
    Bill Bonney January 4, 2013 at 3:33pm

    I've disconnected the 5V line from the regulator, it would be a good addition to have a soldered jumper or something to cut the supply if the voltage regulator is not required in your setup. I'm powering using a separate battery for the 'electronics'

  • Developer
    Bill Bonney December 23, 2012 at 7:28pm

    To answer my own question. The APM PM scales 0-50V to 0- 5V (well theoretical max 4.93V 1.5K/(1.5K+13.7K)*50V ) and the current is 0-5V to represent 0 - 90A. The APM PM can only take a max of 18V due to the power regulator, so why not make the scale to say 20V for greater accuracy? the actual max output to the ADC @ 18V is 1.78V

    The Atto sensor is less resolution as it scales to 3.3VDC.

This reply was deleted.

Activity