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Vehicles - Ground / Brushless Motor

« Last post by Gray on August 05, 2022, 05:35:46 am »

Hey! Friends, I found several charts about brushless motors (Brushless Motor Chart), which explain the relationship between motor size, voltage, and speed very well. Honestly, this knowledge is very helpful for beginners. Saving these charts will save you time.

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Hardware / Re: Hobbyking discontinued Revo & Revo Mini

« Last post by Alex H. on August 05, 2022, 04:49:01 am »

I will need help to identify the RF connector that should be on the board.

Looks like a MCX, as MMCX is too small.

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Hardware / Re: Hobbyking discontinued Revo & Revo Mini

« Last post by Alex H. on August 05, 2022, 04:37:06 am »

Some mistakes have been made that day when I bought that board. I bought also a minimOSD 8$. As about the cables, now that it is talked about I wasn't thinking if the cables are included or not, only some options about S.H. and PIN heads were provided on rtf site. I have forgot about the pin heads, but I have some at home, this will not be a problem. Cables I still have some at home, possible the S.H. 10 pins connector also.

The remaining part will be the antenna connector on the board and the sma antenna adapter cable...

The board is advertised as naked for slim Fc profile... I don't even know that should mean, when there are so many cables hanging from the board.

I have found on aliexpress rfm22b boards with 4,2€, I have bought 4 of them with shipping was 21,15€.

I am still bellow 64€, as this one is asking on amazon:
Hobby King OpenPilot Revolution (Revo) 32bit F4 Based Flight Controller w/Integrated 433Mhz OPLink https://amzn.eu/d/dAYCsgG

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Hardware / Re: Hobbyking discontinued Revo & Revo Mini

« Last post by TheOtherCliff on August 04, 2022, 11:25:46 pm »

TL;DR  If you intend to buy the RF parts and add them, you may as well buy a complete one.  On the other hand, if you need to swap the RF board for a different band (433MHz -> 868 or 915) anyway, then this seems like the way to go.

Now we need that enhancement to allow a Revo to act like a plain OpLink...

As a Revo class board but without telemetry it is a good price, especially if you buy multiples, but it looks like the RF connector, cables, antenna are missing too.  Probably the rest of the back-side components (for RFM22B) are there if you want to build it out.  Servo pins appear to be free if you want them.

eBay used to be a good place to buy things like RFM22B, but they want like $18+ (none from china) for them now!!!  Luckily aliexpress has them for $3.50 free shipping if you are willing to wait 2 months.  I don't know how long the Ali buyer protection is.  It may be a scam.  On eBay lately, if shipping says it will take more than 1.5 months, then don't order it because it probably won't arrive and they hope you will forget by then.

If you want to build it out, it is still about 18+8+4+5= $35 for 1 (without cables or antenna).  Much better price for 2+.  About (36+8+7+7)/2= $29 each for 2.

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Hardware / Re: Hobbyking discontinued Revo & Revo Mini

« Last post by trust on August 04, 2022, 08:59:09 pm »

That's a great price for this board.
Looks like the OPLINK RF board is not attached, though there is a space to solder it (not easy).
Without that not sure how you connect an OPLINK.
Does it come with the 10 pin cable?
The mini REVOs I referenced have a dedicated connector for the OPLINKs - one advantage.

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Hardware / Re: Hobbyking discontinued Revo & Revo Mini

« Last post by Alex H. on August 04, 2022, 07:48:45 am »

If all you want is stabilized flight controls, they work fine. Great for quadcopters.

I want a flight controller that supports telemetry, GPS and OPLink, at least this is my target for actual drone.

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Hardware / Re: Hobbyking discontinued Revo & Revo Mini

« Last post by Alex H. on August 04, 2022, 07:38:40 am »

Please share the link where you got your cheap Revo/Sparky2.

Sure, I can, as I'm not affiliated with them or something. Looks like they are located in USA Florida, and the cheapest shipping to Germany is 8$.
It is a Revolution V2, but looks like a combination between revo and sparky2 but without the RFM module.

https://www.readytoflyquads.com/openpilot-cc3d-revolution-acro

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Hardware / Re: Hobbyking discontinued Revo & Revo Mini

« Last post by trust on August 04, 2022, 06:25:44 am »

 I still have a ton of Atom flight controllers, which also work with Librepilot, but don't have a lot of the features such as connections for GPS, OPLINK, and more. We switched all of them out when we went with the mini REVOs - those still seem to be readily available. We were getting Atoms for $10-$20 each.
If all you want is stabilized flight controls, they work fine. Great for quadcopters.
I think these could handle up to 11 outputs with cPPM input. But we just used the 6 standard servo pin outputs.

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Hardware / Re: Hobbyking discontinued Revo & Revo Mini

« Last post by TheOtherCliff on August 03, 2022, 09:08:53 pm »

Please share the link where you got your cheap Revo/Sparky2. 

18+8 is a great price for a Revo class FC !  ...  Hmmm, I do wonder if you might be getting a CC3D at that price.  If they have a picture, the easiest way for me personally to tell is by the size of the CPU chip in the middle, much smaller on CC3D.

Please come back and tell us about it when it comes in!

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Hardware / Re: Hobbyking discontinued Revo & Revo Mini

« Last post by Alex H. on August 03, 2022, 07:24:20 pm »

It seem to me that these boards are available at reasonable cost, so it sounds a bit as if you are trying to generate interest in making them, or asking permission to make them.

Finally found one at 18$(I don't even know if these are legal, but the price looks good to me, comparing with 64Euro on amazon) + 8$ shipping, I was thinking that is oversea it will cost considerable more, but 8$ it's acceptable taking into account that I can add some other parts to my order.

Beware that dead looking projects can come back to life if there is money involved.  You try to sell boards and OpenPilot could tell you that you are legally required to pay them.

Only if the boards look the same with theirs ... looking at the sparky project.

I'm fine with the cheap one I found...