[balbs]

Hello,

My first post here. I'm setting up a Revo and hooked up a standard Pixhawk power module so that I can get the Voltage and Current values to the Librepilot GCS. Can you tell me what voltage and current factor values should I put in?

Thanks!

[f5soh]

Hi,

Factor values should be around:
10 for Voltage
16 for Current

To be adjusted to match measurement, also consider adjusting the "ZeroCurrent" value when idle.

https://librepilot.atlassian.net/wiki/display/LPDOC/Configure+a+Current-Voltage+sensor

[balbs]

Thank you!

[carpy]

The Pixhawk power module is 5 volts, correct?  If so, be careful as the Revo is expecting 3.3v I believe.

[balbs]

I'm not using the power module to power the Revo. I'm just using it to get battery voltage and current readings.

[carpy]

I figured that.  I'm just trying to make sure you saw the following warning:

"Any sensor can be used as long as the input voltage to Revo's Sensor Port pins does not exceed 3.3V. Higher values can damage board's CPU!"

[f5soh]

That the input voltage for ADC input pins, should be 3.3V max.

Revo can be powered up to 10V, also used for all accessories: GPS, receiver... so usually +5V

[Mateusz]

Here it says it provides 5.3+ V power measurements http://ardupilot.org/copter/docs/common-3dr-power-module.html#connecting-the-pm-to-a-flight-controller-board
If that is what it says, then the voltage gets scaled not to max 3.3V but to max 5.3V. That's what some voltage sensors do. Revolution ADC can accept max 3.3V levels.
So you need sensor that scales voltage to below 3.3V like AttoPilot one (I am using that one, but requires soldering).

[f5soh]

The APM page say only the powermodule provides +5.3V, nothing more.

APM power module / sensor fit perfectly what revo need if you check the PixHawk specs:
https://pixhawk.org/modules/pixhawk

[balbs]

The APM page say only the powermodule provides +5.3V, nothing more.

APM power module / sensor fit perfectly what revo need if you check the PixHawk specs:
https://pixhawk.org/modules/pixhawk

The only thing I have connected from the power module to the Revo are pins 6 for ground, 3 for current, and 4 for battery voltage. Am I safe? I entered the values you provided earlier and it seems to work fine. BTW, I have a separate 5V to power the Revo using one of the motor output plugs.

[f5soh]

That fine.