- Body: Diatone FPV250 v2 (banggood, hobbyking)
- ESCs: RCX SimonK 10A
- Motors: ZMR 1804 2400Kv
- Power distribution: HobbyKing Mini power distribution board
- Controller: OpenPilot CC3D
- Propellers: Gemfan 5030
- Receiver: Corona R4FA-SB (Note: might not work with 14SG firmware 5.0)
- Camera: 700TVL Sony CCD Boardcam
- Video transmitter: SkyZone TS5823 200mW (banggood, hobbyking, dx)
- Video antenna: Noname "mushroom" antenna
- OSD: Super Simple OSD (hobbyking, banggood)
- Battery connector: EC3 (hobbyking, banggood, dx)
These are parts that you could use to get an even cheaper build but I chose not pick something a little bit better or a cheaper product has arrived after I ordered the parts.
- Flight controller: KK Multicopter
- ESCs: RCX 12A Sky (frankly, this is junk)
- Camera: HobbyKing has a really cheap one. But there are surely even cheaper on ebay!
Motors and ESCs
I always intended to solder the motors wires onto the ESCs. Surprisingly the ESCs are constructed a bit differently than what I'm used to with the wires soldered onto the center of the board instead of the edge. As a result the motor wires were to short and it took some extra fiddling to get it right.
|ESC with cables soldered into the center of the PCB|
The motors are mounted using the new motor adapters the comes with the FPV250 frame from HobbyKing. They work great but I managed to break a screw while attaching them. Hopefullt this does not indicate future problems.
I attached the two front ESCs with transparent heat shrink just to give a bit illustrative feeling. Now I can should people "how" those ESCs work.
|Motors and ESCs mounted and connected to the power distribution board.|
Receiver and flight controller
I decided to use a single-wire capable receiver with the CC3D using the S-BUS system. This is one of the reasons I go with higher priced CC3D instead of a Naze32 or the ultra-cheap KK boards.
|Single-wire capable FASST receiver|
To make the installation more compact I removed the servo connectors on the CC3D and the receiver and soldered all the wires directly.
|Receiver without the plastic case|
As I was removing the servo connector pins from the receiver I managed to break away the soldering pad. I tried to fix this by soldering signal cable directly to a surface mounted resistor on the circuit but didn't succeed.
|Receiver with only the necessary wires soldered and wrapped in heat shrink|
Instead I had to use the PPM output to connect the receiver to the CC3D. But it turned out it works quite fine.
|Receiver and CC3D installed on the frame|
I picked the cheapest camera I found for this one with a few basic requirements, size and focal length. I really love the wide angle I bought for my last build, it gives a strange feeling at first but when you get used to it is really nice to see so much more of the surroundings. The choice fell on a $27 board camera. I could have found a cheaper one easily.
|Camera and camera mount assembly|
Instead of using a telemetry system, which is expensive, I will install an OSD to monitor battery voltage. This is the cheapest one I found. I intended to do this mod to get RSSI displayed on the OSD but I fear it might bright noise passed the LC filter so I saved that for a later build.
|Super simple mini OSD|
I built the classical LC filter to remove/reduce any ESC noise that might interfere with the video signal. I also removed the connector pins from the OSD to solder cables directly instead. I get more and more into soldering and start wishing they would sell more stuff unsoldered.
|LC filter and liberated OSD board|
The OSD board is actually quite large. They could definitely have made it smaller. I built a kind of stack together with the LC filter to make them fit together nicely.
|LC filter, FPV power distribution and OSD in one|
Some heat shrinking to keep everything and double sided tape to attach it. I used an old wire to secure it. Usually I would use a cable tie of course.
|OSD and LC filter mounted on the frame|
This is the finished frame, except for the antenna that hasn't arrived yet. I will try flying it with the included whip antenna anyway just to see how bad it really is.
And the CC3D china clone that everyone says is crap, it's really kicking it!
Average current: 6.5A
Weight without battery and mobius: 353.3g
Total cost: 204 USD