Voltage problem!!!!

You really need to give some more details. What FC? Which receiver? Battery voltage you're running? Is the FC powered through BEC or ESC?

sorry for your trouble - but people will be able to help better if you list all the facts.

 

try switching your power feed from another esc (you are powering the fc from only one esc , right?)

 

Yep, swap the ESCs. Also, have you measured the voltage coming from the battery to make sure the battery is cool?

The multiwii definitely wants to run at 5v - and I have read the anything under can damage it (the threshold is about 4.7 IIDC). Is it possible the FC got short-changed on power at some point?

 

Are you confident the battery is fully charged? Has the quad ever worked correctly?

 

The measurement of a 3S battery will be over 14v. You should take a look at the sticky about Lipo batteries. It's really informative and will answer most of your battery questions.

There are 2 ways to power the RX & FC. One is through the servo coming from a ESC (as long as there is an onboard BEC - OPTO style do not). The other way is with an external UBEC that gets power from the battery and provides solid power to the FC and/or RX.

If you have an ESC that can provide power - then when that is plugged in to the FC it gets power. Also, when the FC is connected to the control channels of RX, one of the channel connections should have all three wires plugged in (signal, power and ground). That will provide power to the RX.

Hope that makes sense.

 

ok back to step one

where are you reading 2.9 volts?
what board is it?

 

Better yet, what exactly is the problem you're having???

is there no power at all getting to the FC? Have you attempted doing the throttle calibration for the ESCs - which removes the FC from the equation all together?

 

Im sorry, I'm trying to help here, but we may have a little communication barrier.

If you have put the battery power directly to it and it worked, that's a start. If the same thing happened with another receiver, then those 2 tests should prove that it's not the receiver. The next test would be to plug 1 ESC servo cable into the throttle channel of the receiver (all 3 wires should be present). Turn on Tx, and then provide power to the ESC.

See if that gives you power to the RX.

If you haven't ever been able to bind - you might want to do this first - just powering the RX the way you listed above (battery and jumpers?).

 

Ok good. Let us know how it goes. If it doesn't work from that 1 ESC, unplug it and try plugging the servo from another ESC to see if that works. Could be a bad ESC, or servo wire.

Technically it it doesn't need to be the throttle channel of the RX, that's just the one you use to calibrate your ESCs when you get the RX working correctly.

which was the red wire not showing any power? From the ESC servo lead?

 

Which red wire? The servo red power wire? The red wire that connects battery to ESC???

Give us specific details of what you mean by "connect". How have you tried to connect it? Did you already plug the servo in to the RX channel directly (no FC) and the ESC power cables to the battery (PCB)???

When you plug the RX servo to the FC - the way it would be to run the quad, is there power to the FC?