[thanos59]

hi from Greece
i am going to bild a 450 quadcopter with revo controller,in some videos on youtube they supply the revo with 5 volts but in librepilot says that needs 3.3volts max using voltage divider  otherwise the revo will destroy,can i use 5volts without any problem?

[kennyevo]

Hi! I'm powering the revo with my ESC, I think it's 5V not 3, but I'm sure there are pros here who can say it for sure

[Mateusz]

I used to power Revo with 5V BEC. When you check git repository, there are schematics (verify yourself if in doubt). According to schematics, there are three 3.3 regulators U1, U2 and U9 which power up the internals. Servo headers on another hand are all connected together and to unregulated pin, that also goes into the GPS uart. That means that main-port and other output/input ports will have the same voltage as you feed into Revo. So if your GPS units can't accept 5V then you might be in trouble. Otherwise as long as your Revolution board is as in original schematics (not modified) then powering with 5V should be fine. Person that produced that board, should state what voltage is required.

[f5soh]

some videos on youtube they supply the revo with 5 volts but in librepilot says that needs 3.3volts max using voltage divider  otherwise the revo will destroy,can i use 5volts without any problem?

The 3.3v limitation is only for voltage/current sensor input on revo sensor port

You can power your Revo up to ~10V, assuming your GPS or RC receiver can support that
Around 5V is just fine in all cases.

[thanos59]

thank you for your replies,i am going to use this gps http://www.ebay.com/itm/311498030791?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT,which is your opinion?

[f5soh]

Not the best choice, this one doesn't have wires for i2c mag... maybe the mag is here but you need to add I2C wires by yourself.

Next release support external mag as I2C and also Naza GPS (or clones) and his internal mag using only one connector/serial port.

As an example this one have the wires but you still need the right connector for Revo...
http://www.banggood.com/Ublox-NEO-M8N-Flight-Controller-GPS-with-Protective-Shell-for-PIX-PX4-Pixhawk-p-1005394.html

http://opwiki.readthedocs.org/en/latest/appendices/jst-sh.html

[Mateusz]

I will just add another reason why it is bad choice. The included mast has just one screw. This means that it is likely to rotate/move and heading of the compas inside GPS unit wont be the same everytime it moves. If GPS unit with mag moves, you need to recalibrate again, as calibration is not valid anymore. You should buy GPS unit alone and proper mast for it with at least two screws to mount it.

[f5soh]

Calibration still Ok, whatever the orientation.

You just need to change the Mag orientation using txPID

[thanos59]

thank all for your useful informations