[tinou]

Hello.
I'm new in the world of multirotor.
I have make a quad500 with revolution board.
I have a minimosd but when i connect my batterie on it i don't have my batterie level (stay at 0.00V).
So i think i need to use current sensir who is connnect to the revo board.
Librepilot said to use this one https://www.sparkfun.com/products/9028
But it's hard yo find it.
Can i use this one?
 http://s.aliexpress.com/yaqUrUra

What the difference between attopilot 45A, 90 A and 180A?

Thanks for all

[Mateusz]

Can i use this one?
 http://s.aliexpress.com/yaqUrUra

This says
"Voltage and current measurement configured for 5V ADC"
The ADC on the Revolution is the 3.3V one. So no, you can't. You need voltage divider that scales voltage to 3.3V level.
There are plenty PCB boards that do include votlage dividers that scale voltage to 3.3V level.

For example this one https://www.banggood.com/Matek-FCHUB-6S-Hub-Power-Distribution-Board-5V-10V-BEC-Built-in-184A-Current-Sensor-p-1147591.html
Says ADC 3.3V. All STM32 chips to my knownledge have 3.3V ADC (Analog to digital converter) used to measure voltage.

So don't order the one in your link, 5V feed to ADC would fry your Revo.

These two power distribution boards do have OSD included
https://www.banggood.com/Realacc-HUBOSD-ECO-H-Type-wSTOSD8-Current-Sensor-5V-12V-Dual-BEC-PDB-p-1068098.html
https://www.banggood.com/Realacc-HUBOSD-ECO-H-Type-wSTOSD8-Current-Sensor-5V-12V-Dual-BEC-PDB-with-XT60-Plug-p-1085412.html

[tinou]

Thanks for your answer very clear and very speed.
Thanks for all

[Mateusz]

You are welcome.

What the difference between attopilot 45A, 90 A and 180A?

It is the maximum current that can go through the sensor. If you think your motors won't pull more than 30A and you have 4 motors, then just 4*30A = 120A max.
You can add 15% for safety so 120+120*0.15 = 138A. Power boards I linked are 184A and 140A (each output 35A max per motor).

OSD with data from FC gives you more info, like current, voltage, heading, throttle, flight mode, GPS, RSSI etc.. which is nice. On tiny models I just want voltage, so I skip OSD and use RunCam Swift Micro 2 camera which has input for battery 8-36V that does OSD but only overlays voltage info.

[tinou]

Thanks now i know the difference! Since 2 weeks i'm searching about that!
I have very struggled  with my minimosd now i have all informations that i want (exclude batterie of course ) so use a new osd with the pbd and past 3 or 4 hours for have a result... not for the moment ;-))
Actually i fly with just my runcam like you for have batterie voltage