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10 votes
Accepted

Can a receiver get damaged if you power it up without an antenna?

Running a receiver without an antenna should not cause any damage to the receiver, as no RF power is sent to the antenna (if your receiver has an active antenna there may be a DC bias present, but ...
Kralc's user avatar
  • 6,056
7 votes
Accepted

What would a basic fixed-wing electronic setup look like?

The main things you need are a motor, battery, electronic speed controller (ESC) and servos. The ESC sits between the battery and motor, and it also has a thinner cable that goes to the receiver. The ...
Robin Bennett's user avatar
7 votes
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How do you build and use a smoke stopper?

There are different ways, but a common one is to put a light bulb in series with the positive battery lead. This works because it will allow low currents through to power the flight controller, but ...
Drones and Whatnot's user avatar
5 votes

What are the usual engineering considerations for a UAV current sensor?

Is the shunt resistor usually mounted high-side (i.e. at the positive battery terminal), or low-side (at the negative terminal), and why? Does it matter? There should be no significant difference ...
Kralc's user avatar
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5 votes
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How to prevent a 5V supply from sagging to 4.6V when the FPV camera is on?

I've pulled a few specs together from the parts you linked to: Flight controller: Input: 2S to 6S LiPo (7V to 20V) Output: 5V 3A VTX: Input: 7V to 24V Output: 5V 0.3A Camera: Input: 5V 0.65A --...
Kralc's user avatar
  • 6,056
4 votes
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Quality of transmitted image and electrical problems

There’s a lot to unpack here, so I’m going to give a general kind of advice that should be helpful for anyone trying to get cleaner video: Electrical Power There are two main aspect to the image ...
Drones and Whatnot's user avatar
4 votes

How do you build and use a smoke stopper?

A small scale power supply with over-current protection also works well. The type to get are little cheap build yourself units, with a display that allows you to adjust output voltage and display ...
ctzsnooze's user avatar
  • 301
4 votes

How do you build and use a smoke stopper?

There are two problems to mitigate here - incorrect polarity and overcurrent - which have different solutions but can be used together. To protect against a battery being connected backwards you need ...
Kralc's user avatar
  • 6,056
4 votes
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How do you waterproof your electronics?

The first step I take to help protect my gear from shorting out from water is to apply silicone conformal coating to all the electronics I can. I cover the ESC, flight controller, vtx, and any other ...
5zero7rc's user avatar
  • 1,130
4 votes

What would a basic fixed-wing electronic setup look like?

Summary The necessary electronic components: Transmitter & receiver, ESC, motor, servos. (yes, it really is that simple) How they are linked together: basically; battery plugs into ESC input, ...
Jacob B's user avatar
  • 5,792
4 votes

What would a basic fixed-wing electronic setup look like?

The image below shows a fairly basic fixed wing electronic configuration. Depending on your design you might not need it all, and for more complicated builds with flaps and retractable gear you would ...
Kralc's user avatar
  • 6,056
3 votes

Amperage of FC, ESC

However, sometimes I see in OCD far beyond 5A and 6A. ... Shouldn't they burn down? This is the difference between a rating for continuous, burst, and instantaneous current flow: Continuous: maximum ...
ifconfig's user avatar
  • 6,008
3 votes

Is my flight controller dead or can I save it?

Something similar happened to me only with a different cause, my quad crashed and the omnibus f4 v2 fried itself in the logic side but it could still power the esc and the 5v pads. So, I think sadly ...
Vichot's user avatar
  • 151
2 votes

What are the usual engineering considerations for a UAV current sensor?

Using PM07 power management board from Holybro as an example. They use shunt resistor on the high side. Voltage across the shunt resistor is then fed into the Texas Instruments INA169 current sense ...
jpou's user avatar
  • 411
2 votes

Serial Communication Not working in APM 2.8

There are a bunch of problems which need to be overcome when using the RPi GPIO serial port. The RPi normally runs a login process on the serial port, this will need to be disabled. ...
Paul Kendall's user avatar
1 vote
Accepted

Why does ELRS use only radio modules with SPI control and UART?

It turns out ELRS requires way higher communication protocol rates. So that's why they use SPI at multiple MGhz rates. What's more, those UART modules are not really UART natively. I've dissambled one ...
Secret-guy's user avatar
1 vote
Accepted

Amperage of FC, ESC

sometimes I see in OCD far beyond 5A and 6A Those specs are probably per motor, so 4 motors could pull 20A. And I think you mean OSD, for On Screen Display. 1c = 12 A Nope, 1200mAh is 1.2A, so 1c ...
Robin Bennett's user avatar
1 vote
Accepted

What are controllers of Parrot AR drone 2?

After reading relevant materials, i think I have find the answers for this question. Q1:Since AR drone2 is a proprietary system, this company didn't publish any documentation about the internal ...
DarkKnight's user avatar
1 vote
Accepted

FPV camera and beeper seems to be interfering with each other

The problem was indeed the 5V regulator. I bought an external 5V 1.2A regulator and hooked up the camera and VTX to it, and all my problems have disappeared.
Hannes Hultergård's user avatar
1 vote

How to prevent a 5V supply from sagging to 4.6V when the FPV camera is on?

I am not an electronics expert, but it sounds like it is a problem with the voltage regulator and as such, adding a capacitor wouldn’t solve the problem. I would suggest you try running the camera ...
Drones and Whatnot's user avatar
1 vote

How do you waterproof your electronics?

As mentioned a conformal coating is what you need. There are various types and methods of application. I haven't personally used this product, but it does look like the best and easiest: https://...
strepto's user avatar
  • 356
1 vote

How do you waterproof your electronics?

Just to add some extra info to the other good answer, there are liquid products specifically for coating PCB's. They come with a small brush for easy application and you can easily solder through the ...
3k-'s user avatar
  • 439

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