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Author Topic: Robocat Build Step by step with lots of pics !  (Read 2907 times)

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Offline Scubacrazy

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Robocat Build Step by step with lots of pics !
« on: January 04, 2017, 11:09:26 »
Hi All.
After much reading, asking questions, and general you-tubing, I have decided to build my first quad.
A Robocat 270.

The idea of this thread is to provide a true and honest step by step build thread, warts'n'all , which may help anyone in the future who is considering building the same model.
Whilst doing my research I found it hard to find a complete step by step for a build written from a beginners' point of view. especially the problem solving side of things.
I will record as much as I can in pictures, and will also go through my thought processes when faced with the problems which will inevitably crop up.

OK, so with the above in mind, I'll start .
First, why the Robocat, you might be asking?
Well, this is my first ever build, and although down the line I might well decide to build a small, ultra quick 210 x-racer or something like that, I thought for a first timer that would not be a sensible model to start with.
The Robocat is large, with plenty of room for electronics etc, and although I do know how to solder, I don't think I am up to doing anything too fiddly just yet.
Secondly, this is the machine I am going to learn on, so I would rather have a flying brick to learn on, rather than a super quick flying missile.
Plus, I think it looks quite cool for a first build.

In my next post I'll list what equipment I have ordered, and the tools etc I will be using for the build.



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Re: Robocat Build Step by step with lots of pics !
« Reply #1 on: January 04, 2017, 11:39:42 »
I'll start off with a list of the tools and equipment needed for my build. It may well be that there will be other things I need, but if that's the case, I'll get them when the need arises.
If you are reading this and can think of anything I may have missed, feel free to tell me.

In fact, one of the aims of this thread is for the more experienced builders out there to advise/help/guide/laugh-at-the-newbie, so any input gratefully received !

Soldering station - mine is a variable 60watt, with a range of tips
Solder - good old 60/40 lead with rosin core for me.
Helping hands - useful until I can work out how to grow another arm.
Strong magnifier - useful for checking soldering work for shorts etc.
Solder sucker - in case I need to unsolder stuff!
Flux pen - I use this a lot, others don't.
Solder tip cleaner - I use the metal (brass?) wool type.
Wire cutters and fine nosed pliers, and tweezers.
Screwdrivers and hex drivers in a range of sizes.
Assorted nylon standoffs.
Assorted heat shrink.
Multimeter - not everyone has one, and probably not essential, but I do have one, so it's on the list !
Blue thread-lock
Cable ties
Double sided sticky foam
Velcro tape
Various gauge cables/wires.

I think that's about it.
I was lucky, as I had all this at home anyway, but if you have to buy it all, it's a few quid to invest.

Next post I'll list the actual quad stuff ordered.

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Offline Cheredanine

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Re: Robocat Build Step by step with lots of pics !
« Reply #2 on: January 04, 2017, 11:46:10 »
List looks good, don't see any omissions, but some bits I would stress:
1. Solder iron - don't just get any cheap soldering iron, this will make life very hard, as you said, get a solder station with variable temp, 48-60w
2. Hex drivers - if you buy cheap you will have issues with chewing things up, worth investing in decent drivers, also with cheap kits you tend to get cheap aluminium bolts, these will also chew up, best to invest in some decent ones and replace the ones that come with the kit. Good sources of excellent bolts are carbolts and a little more expensive GWR fasteners

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Re: Robocat Build Step by step with lots of pics !
« Reply #3 on: January 04, 2017, 14:16:42 »
Right, now on to the model parts.
As most people know, it is quite difficult, but not impossible, to order everything needed to build a quad (or tricopter, hexcopter etc.) in the UK from just one supplier.
Inevitably various bits have to be ordered from various suppliers.

Before I go on, I just need to clarify my aims for this build.
It is simply to build my first quadcopter in order to learn more about the physical building, tuning, and of course learning to fly it.
It is not to build the best ever quad, from the finest materials, or using the best components. It is a learning process for me, and if successful will lead to a 2nd build, which I guess will be a better, lighter frame, faster, more control etc etc.
Like most other people, I have asked questions, listened to some of the advice given, ignored some of the other advice, and formulated my own idea on what I want.
My guess is that this is the way a lot of beginners go.
So yes, I could have bought better parts, which will be recycled for my 2nd build, thus giving better long term value for money, but I decided to go the cheap route, and next time maybe do it differently. (Again, I think a lot of beginners feel this way)

So, having decided on a Robocat, I found a UK supplier, BuildYourOwnDrone, and ordered the carbon fibre frame, although they also sell a glass fibre version.

http://www.buildyourowndrone.co.uk/robocat-270mm-3k-carbon-fiber-mini-fpv-racing-quad.html

I also ordered the power distribution board for the build, also from BYOD

http://www.buildyourowndrone.co.uk/robocat-270mm-power-distribution-board.html

This should be delivered today at some point.

Then, the motors, esc's and Flight controller.
I found a "kit" on Ebay, consisting of:

4 X RS2205 2300Kv motors
4 X DYS XS30A BLHeli_S Esc's
1 x SP Racing F3 Flight Controller Acro

Again, not the best out there, but they will do for now.
Specs for these: (copied from Ebay page)

Description for Motor:

Brand Name: BETTERGO RC
Model: RS2205-2300
Framework: 12N14P
No. of Cells: 3 - 4S
Color: Red
Length: 31.7mm
Shaft: M5
KV: 2300
Max Thrust: 1024g
Diameter: 27.9mm
Propeller Suggested: HQ 5045 BN
Weight: 30g
Features for motor:
Race Spec Performances
High Strength N52 Neodyum Magnets
Active Cooling Fins Greatly Reduce Motor Temeratures
Low CG, Light Weight Design
Japanese Bearing For Performances
Enchance Anti Off U Ring For Safety & Stablility
Dual Lock CW / CCW Locknuts

Features for SP Racing F3 Flight Controller Acro:
Practical - Easy to access connectors and solder pads.
Configurable - Choose to use connectors, solder pads or pins.
Stackable - Mount to your PDB or OSD.
Compact - Only 36x36mm.
Professional - Symmetrical, Neat and Tidy.
8 Dedicated PWM outputs
8 PWM Inputs
36 I/O Connections
72Mhz Clock Speed
3 Hardware Serial Ports
8Mb Flash Storage

Specifications (Acro Version):
The hardware was designed by the lead developer of Cleanflight to be more capable than the previous-generation STM32F1-based boards after hearing feedback from the Cleanflight users, contributors and top-pilots.

36x36mm board with 30.5mm mounting holes
Weight ~6 grams
Acro version is without Compass and Barometer Sensors
STM32F303 CPU, 72Mhz inc FPU
High-Capacity Flash (Acro and Deluxe)
MPU6050 accelerometer/gyro
MicroUSB socket
2x 8pin JST-SH sockets (PPM, PWM, SERIAL RX, GPIO, ADC, 3V, 5V, GND)
8x 3pin though-holes for pin headers for ESC/Servo connections
2x 4pin though-holes for pin headers for 2x serial ports
1x 2pin though-holes for pin headers for battery voltage
1x 2pin though-holes for pin headers for buzzer
1x 4pin JST-SH socket for I2C
1x 4pin JST-SH socket for SWD debugging

Description for ESC:
- Brand Name: DYS
- Item Name: XS30A Solder Version
- BEC: NO
- Weight: 8.65g
- Size: 45*16.5*5.8mm
- MCU: Silabs EFM8BB2
- Input Voltage: 3-6s Lipo
- Firmware: BLHeli Bootloader & BLheli_S
- BLHeli_S does Damped Light only
- High-current burst rating
- High-Resolution Throttle steps
- BLHeli_S ESC with Hardware generated PWM synchronous to MCU yields ultra-quiet motor performance
- Firmware upgradable via signal wire (works with USB Linker for XM series)
- Supports Motors with super high KV (EFM8BusyBee 50MHz can handle up to 500k eRPM)
- Supports 1-2ms signal, Oneshot125, Oneshot42 and Multishot

Package Included:
4 x BETTERGO RC RS2205 2300KV Motor (2 x CW, 2 x CCW)
4 x Motor Protector Cover Green
4 x DYS XS30A ESC
1 x SP Racing F3 Flight Controller Acro

Next, from HobbyRC UK, batteries, charger, and props

A couple of these:
HobbyRC Race Spec 1800mAh 4S 45-90C LiPo Battery

One of these:(Thanks to Cheredanine for the suggestions)
Imax B6 Compact 2-6S LiPo and NiMH AC Charger
3 sets of these:
DAL T5040 V2 Tri-Blade Super Durable Propellers (2x CW + 2x CCW) - Green

That should get me started at least.

Radio:
Flysky FS-i6X 10CH 2.4GHz AFHDS 2A RC Transmitter With FS-iA10B Receiver

Awaiting delivery of these, but should be soon, I hope.

Well that lot should keep me out of mischief for a while, or at least it will when it all arrives !

Sorry for the long post, but it is in the spirit of a step by step to include absolutely everything !

Oh, and cost so far:

Frame kit  £42.00 (cheaper elsewhere, I decided to buy from UK) - BYOD
Motors, ESCs & FC  £60 - Ebay
Batteries, charger and Props £80 - HobbyRC UK
Radio Tx & Rx  £45.00 - BangGood

I haven't had to buy the tools/soldering station etc, but if I did, I would estimate around £175 for everything.

That's it for this post.
I'll update when the bits arrive, and the build can begin !!

Offline Cheredanine

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Re: Robocat Build Step by step with lots of pics !
« Reply #4 on: January 04, 2017, 14:50:51 »
Just a slight concern on your eBay kit mate,
Firstly I suspect it is from China? Thought we were aiming for uk suppliers?

I appreciate we are not looking for top end
The motors are cheap clones of emax rx2205 2300, I have issues with the originals, a cheap clone isn't gonna improve that, I think I would suggest spending a little more, there are motors which are not top end but are very reasonably priced available in the uk such as hellfire

Finally the flight controllers again a cheap clone, not genuine, the sprf3 uses an mpu6500 gyro, not a 6050 (in fact it may even be the 9250)
The problem with cheap clone fc, quite apart from the fact you are not supporting the creator of cleanflight and have no real recourse if there are software issues, is they tend to use cheap components that break pretty quickly,  the problem with the sprf3, aside from the gyro (the clone one is actually a better gyro for a quad) is those just-sh connectors which may seem a great idea if you are not confident soldering but actually are a common fail point, again there are cheap genuine uk supplied boards such as the skyline series,

Offline Scubacrazy

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Re: Robocat Build Step by step with lots of pics !
« Reply #5 on: January 04, 2017, 15:56:18 »
Just a slight concern on your eBay kit mate,
Firstly I suspect it is from China? Thought we were aiming for uk suppliers?

I appreciate we are not looking for top end
The motors are cheap clones of emax rx2205 2300, I have issues with the originals, a cheap clone isn't gonna improve that, I think I would suggest spending a little more, there are motors which are not top end but are very reasonably priced available in the uk such as hellfire

Finally the flight controllers again a cheap clone, not genuine, the sprf3 uses an mpu6500 gyro, not a 6050 (in fact it may even be the 9250)
The problem with cheap clone fc, quite apart from the fact you are not supporting the creator of cleanflight and have no real recourse if there are software issues, is they tend to use cheap components that break pretty quickly,  the problem with the sprf3, aside from the gyro (the clone one is actually a better gyro for a quad) is those just-sh connectors which may seem a great idea if you are not confident soldering but actually are a common fail point, again there are cheap genuine uk supplied boards such as the skyline series,

Another thankyou from me.
You are right. The kit is in fact from China, Stupidly, it said it was despatched from UK, or at least I thought it did !
The motors I will look at again. Any links to decent ones appreciated.
I have looked at a few alternatives, but when I think I've found some they are out of stock.
As for the FC. Really don't know which one to go for, although would prefer an original rather than a clone.
You have mentioned before about avoiding certain features on boards, but I must have missed that one.
So, I'll rethink the motors and FC.
Problem is, there are so many vids on builds, using any of the FCs, and they all work, even most of the clones.

Offline Scubacrazy

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Re: Robocat Build Step by step with lots of pics !
« Reply #6 on: January 04, 2017, 16:00:02 »
Meant to mention: I was originally thinking of an OpenPilot CC3D or Naze board originally.

Offline Cheredanine

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Re: Robocat Build Step by step with lots of pics !
« Reply #7 on: January 04, 2017, 16:15:11 »
Stick to cf board for a beginner. (Openpilot hasn't supported cc3d for over a year)

Rotorgeeks have just released the perfect fc for this at a very good price but they are Canadian, don't know if they will have uk supplier

Something like this:
http://www.hobbyrc.co.uk/emax-skyline-f3-acro-flight-controller
And here:
http://makeitbuildit.co.uk/index.php?route=product/product&path=87_31&product_id=897
Are cheap and will work well although still using jst-sh

Motors:
Dys would be pretty cheap and decent:
http://www.hobbyrc.co.uk/dys-se2205-pro-2300kv-racing-edition-3-5s-brushless-motor

 the hellfire ones are here (out of stock):
http://www.radioc.co.uk/Hellfire-2204-2300KV-Motor-p/2122.htm
But suggest if you are looking for economy and not too worried about speed:
https://www.dronebit.co.uk/motors/2205?product_id=385

Most of the build stuff is translatable from one component to another


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Re: Robocat Build Step by step with lots of pics !
« Reply #8 on: January 04, 2017, 16:34:41 »
Stick to cf board for a beginner. (Openpilot hasn't supported cc3d for over a year)

Rotorgeeks have just released the perfect fc for this at a very good price but they are Canadian, don't know if they will have uk supplier

Something like this:
http://www.hobbyrc.co.uk/emax-skyline-f3-acro-flight-controller
And here:
http://makeitbuildit.co.uk/index.php?route=product/product&path=87_31&product_id=897
Are cheap and will work well although still using jst-sh

Motors:
Dys would be pretty cheap and decent:
http://www.hobbyrc.co.uk/dys-se2205-pro-2300kv-racing-edition-3-5s-brushless-motor

 the hellfire ones are here (out of stock):
http://www.radioc.co.uk/Hellfire-2204-2300KV-Motor-p/2122.htm
But suggest if you are looking for economy and not too worried about speed:
https://www.dronebit.co.uk/motors/2205?product_id=385

Most of the build stuff is translatable from one component to another

Thanks yet again !
I'm going to order the EMAX FC from HobbyRC Uk.
Looking at the DYS motors, but it seems they only have the CCW Spin version, I can't see where to order the CW spin. I know rotation can easily be reversed, but am concerned about props coming undone. Or is this a non issue? If not, I'll order 4 of these at the same time as the FC.

Offline Cheredanine

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Re: Robocat Build Step by step with lots of pics !
« Reply #9 on: January 04, 2017, 16:56:13 »
Hobbyrc seem to have both. It is on a drop down on the motors actual page above add to basket, but actually best way to do it is not use the stupid prop nuts but use an m3 nyloc nut - I don't have quads I fly that use motors that are cw and ccw, they all have normal threads any nylon nuts and I never have problems
(Caveat, that isn't completely true, I have a set of armattan oomph which don't use either but do come in cw and ccw)

Edit recomend you phone Mike at hobbyrc, he is a pretty helpful guy, explain you want dys but you want nylon nuts, he will tell you which to buy, he may even throw the nuts in

If not:
http://www.buildyourowndrone.co.uk/lumenier-m5-green-aluminum-low-profile-lock-nut-set-of-4-ccw.html
« Last Edit: January 04, 2017, 17:01:57 by Cheredanine »

Offline Scubacrazy

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Re: Robocat Build Step by step with lots of pics !
« Reply #10 on: January 04, 2017, 18:38:06 »
Ahh, OK, just seen the drop down box.
Ordered the FC and the 4 x motors now.
Thanks again for the advice, I really do appreciate it.
Time to read up a bit on the FC now !

Edit: I did try ringing HobbyRC, but it was just after 5, so I guess they were closed. Recorded message, but no answerphone. No big deal, I'll call tomorrow anyway.
« Last Edit: January 04, 2017, 18:42:55 by Scubacrazy »

Offline Cheredanine

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Re: Robocat Build Step by step with lots of pics !
« Reply #11 on: January 04, 2017, 18:48:32 »
:) Mike is really helpful and knows his stuff,  you can also phone or email him if you have problems with things you bought from him. Really can't fault his customer service and support

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Re: Robocat Build Step by step with lots of pics !
« Reply #12 on: January 05, 2017, 14:17:09 »
Well, the postman and DPD have been today ! Yay !
My Frame kit, along with the integrated PDB has arrived, along with my 4c batteries, and charger, and my Flysky FS-i6X radio with the FS-iA10B receiver too.
Motors and FC are coming tomorrow .
Also got a few sets of props. (DAL T5040 V2 triblades)
Itching to get started, but I'm going to wait until everything is here first.
Watch this space !!

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Re: Robocat Build Step by step with lots of pics !
« Reply #13 on: January 05, 2017, 15:36:29 »
I would suggest you start like most,motors mounting,esc,working your way tonthe pdb,connecting up the motors to esc,esc to pdb,check everything 3 times  :azn
Then move onto the fc and connect to the pdb,then add and bind rx,you can bind the rx now if you have the tx/rx combo.

Then maiden it los but dont go like clappers,learn to get it in air as it takes a punch to take off.be sure to add an led bar/strip.add fpv gear when ready.

A lost alarm/buzzer and battery metre/alarm are handy but i use loc8tor and now i removed all the osd stuff i used for low voltage alarm so realy i just guess how long i fly  :laugh:

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Re: Robocat Build Step by step with lots of pics !
« Reply #14 on: January 05, 2017, 18:14:28 »
I would suggest you start like most,motors mounting,esc,working your way tonthe pdb,connecting up the motors to esc,esc to pdb,check everything 3 times  :azn
Then move onto the fc and connect to the pdb,then add and bind rx,you can bind the rx now if you have the tx/rx combo.

Then maiden it los but dont go like clappers,learn to get it in air as it takes a punch to take off.be sure to add an led bar/strip.add fpv gear when ready.

A lost alarm/buzzer and battery metre/alarm are handy but i use loc8tor and now i removed all the osd stuff i used for low voltage alarm so realy i just guess how long i fly  :laugh:

Thanks for that. Pretty much as I was thinking TBH.
I'm going to knock up a bulb "smoke stopper" as a precaution, just to be on the safe side. I was going to make one today but couldn't find any XT 60s. I get some tomorrow I think.

The only thing which I'm not sure about is the PDB I have. It's the Robocat PDB, but effectively it mounts upside down, which sounds awkward, but I'll see how I go with it.
This is what I mean:



If it proves too troublesome I will get a matek pdb and mount it as normal.
I'll do some pics tomorrow, when I start the build.



« Last Edit: January 05, 2017, 20:45:24 by Scubacrazy »

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Re: Robocat Build Step by step with lots of pics !
« Reply #15 on: January 05, 2017, 22:33:16 »
Rule 1. The first thing you do is connect the fc to cleanflight, check you can flash it, check the sensors work by moving the board and watching the icon

As a basic rule sellers will not accept returns that have been soldered

Rule 2 build a step at a time and test. A smoke stopper is a good idea, I don't use one but I do test with a multimeter

So I start from the pdb.
Attach the xt60, test the continuity between the pads ((including testing for shorts), add a battery, test the reg outputs,

Add the fc, test it powers up correctly from the pdb.

Add the radio Rx, bind and test it works by watching the Rx tab in cf whilst you mess around with the sticks.

I would the sometimes do the escs and test I can connect with blheki_suite before I attach motors, sometimes do it the other way round, the driver is the heat shrink.you are gonna have to solder one side of the escs with the heatshrink slid over the esc and as far away from the soldering as possible, depending on where the escs sit governs which side is easiest to do last

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Re: Robocat Build Step by step with lots of pics !
« Reply #16 on: January 05, 2017, 22:55:49 »
Thanks for that.
Good point about connecting the FC first, before soldering. Something so obvious but easy to get carried away and soldering up first.
HobbyRC have despatched it, and my motors, so I await the text from DPD in the morning.

I have already checked the pdb as you suggested, with my multimeter. All the pads are good, 5 & 12 v outputs all good too.
In fact the pdb looks quite good, the pads are huge with plenty of space in between them for easy soldering ! Track quality is good too.

I'll start posting some pics up tomorrow, if nothing else some-one else might find it useful, especially the Pdb, as there isn't a huge amount of info on that .

My escs and the motors all have pads, rather than wires, so I can custom build the wiring for them.

I am going to go and read some more about blheli_suite now, as it's a bit confusing for me, it's not something I have read much about.
I'm OK with Cleanflight though (I think)

Thanks again to all for any and all contributions and advice.
I appreciate it.

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Re: Robocat Build Step by step with lots of pics !
« Reply #17 on: January 06, 2017, 14:43:25 »
So here I am, eager to start my build, but no ESCs !!
I ordered motors and FC from HobbyRC, but forgot to order escs ! Doh !
So, I have ordered 4 x Spedix ES25 BLHeli_S ESC from Electricwingman, which I hope will be here Monday, if not tomorrow !
So here is a pic of my "box-o-bits", all waiting assembly !

DSCN0502 by Gary Hickling, on Flickr

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Re: Robocat Build Step by step with lots of pics !
« Reply #18 on: January 06, 2017, 15:41:15 »
:)
Perhaps lay it out?

Test the fc!
And let me tell you right now, you are gonna get very fed up with screwing those panels on and off

I did forget, there were not enough bolts for all the panels in the robocat kit I built for my son, I had to use a couple of nylon standoff bolts

Worth dry building the frame to figure out where it will all fit

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Re: Robocat Build Step by step with lots of pics !
« Reply #19 on: January 06, 2017, 15:57:28 »
:)
Perhaps lay it out?

Test the fc!
And let me tell you right now, you are gonna get very fed up with screwing those panels on and off

I did forget, there were not enough bolts for all the panels in the robocat kit I built for my son, I had to use a couple of nylon standoff bolts

Worth dry building the frame to figure out where it will all fit

Yes, doing a layout was my next thought. I have plenty of screws/standoffs etc, so I can get something together I'm sure.

OK, just plugged the FC into Cleanflight. Do I need to flash it, as I don't know whether that is necessary or not?
Also, I noticed the board does move around in the graphic when I move it, and it lets me calibrate Accelerometer, but the "Calibrate Magnetometer" is greyed out. Any thoughts?

Oh. and just has a text from Electricwingman to say my escs are on their way, so here's hoping for tomorrow.

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Re: Robocat Build Step by step with lots of pics !
« Reply #20 on: January 06, 2017, 16:00:54 »
Actually, thinking logically, does my board, (being an acro) even have a magnetometer?
Or am I being stupid

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Re: Robocat Build Step by step with lots of pics !
« Reply #21 on: January 06, 2017, 16:05:33 »
Probably not, but most 250 don't use mag anyway, board sounds like it is working
If you type version into the cli it will tell you what it has installed, always worth running the latest release

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Re: Robocat Build Step by step with lots of pics !
« Reply #22 on: January 08, 2017, 17:54:06 »
Unfortunately I missed the postman yesterday, so my Escs will be here tomorrow.
So that's everything I need to get started,
But could some-0ne advise me on which gauge wire I should use between Esc and motors please. The motors I have are solder pads, as are the escs, so I need to provide the wire between them.
Generally, I go with the following:

16AWG Wire - 50A
18AWG Wire - 30A
20AWG Wire - 20A

Does this sound about right?

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Re: Robocat Build Step by step with lots of pics !
« Reply #23 on: January 10, 2017, 13:43:12 »
Can't honestly answer with absolute certainty mate, all my motors come with wires, that sounds like the awg raining but bear in mind that is constant, you are not providing constant current at those levels for any length of time. Suggest you phone mike again

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Re: Robocat Build Step by step with lots of pics !
« Reply #24 on: January 10, 2017, 19:50:41 »
Can't honestly answer with absolute certainty mate, all my motors come with wires, that sounds like the awg raining but bear in mind that is constant, you are not providing constant current at those levels for any length of time. Suggest you phone mike again

Ha, stupid me, I didn't realise until I opened the box that the cables, although not attached, are included !
Ok, onwards and upwards.
I've done the dry fit build, and all is good with that. (No screws missing, in fact I had an extra bag)
Tomorrow, I'm going to get the header pins soldered onto the FC, and start soldering ESCs and motors onto the PDB.
Pics will follow.

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Re: Robocat Build Step by step with lots of pics !
« Reply #25 on: January 13, 2017, 12:48:09 »
OK, so here's a few pics.
First, for the sake of completeness, a couple of pics of the frame dry build.

DSCN0520 by Gary Hickling, on Flickr

DSCN0520 by Gary Hickling, on Flickr

Nothing special to see really. Frame fits together OK, but the PDB holes were very tight, and needed a tiny bit if filing to get it to fit well.
Talking of the pdb, it's this one I'm talking about.

DSCN0535 by Gary Hickling, on Flickr

There are only the 4 x pairs of contacts to pre tin.

DSCN0538 by Gary Hickling, on Flickr

The XT-60 connector is already attached, and it also has a 12v and a 5v filtered supply out too.

DSCN0523 by Gary Hickling, on Flickr

DSCN0524 by Gary Hickling, on Flickr

So basically, the frame consists of 4 different "layers".
The top, hinged part isn't shown in this pic.
DSCN0527 by Gary Hickling, on Flickr

The difficulty with using the PDB I chose is that the business end of all the connections is hanging "upside down", and makes it a bit confusing when soldering escs onto the board, as the board is flipped when attaching it to the frame.
Anyway. I got on with soldering on the following:

DSCN0546 by Gary Hickling, on Flickr

As you can see, these particular motors do not have the wires attached, but they do come with some 16AWG wire in the box.

And this was my first attempt, I thought I would connect the power leads diagonally across the PDB in order to keep the cable routing tidy.
HOWEVER, when the board is flipped, and mounted onto the baseplate, there is an awful lot of cable to fold and tuck and generally stuff into the gap between the bas plate and the PDB.

DSCN0549 by Gary Hickling, on Flickr

Also, I wanted to have the ESCs in the gap between the PDB and the baseplate, and this much wire stuffed into the gap would not allow it to happen.

So, unsoldered and re-soldered after cutting the power feeds to length gave me this:

DSCN0551 by Gary Hickling, on Flickr

And I know that the ESC in the lower right of pic looks like it's connected wrong, it isn't, it's just the way I've folded and routed the cables !

After this, It's time to assemble.
More to follow . . . . . .

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Re: Robocat Build Step by step with lots of pics !
« Reply #26 on: January 13, 2017, 12:55:29 »
Ahh, forgot to mention.
I also needed to solder this:

DSCN0544 by Gary Hickling, on Flickr

Job done:

DSCN0545 by Gary Hickling, on Flickr

Also, I ordered a buzzer from HobbyRC, and this turned up:

DSCN0540 by Gary Hickling, on Flickr

Not quite what I was expecting, but might be a bit better than the normal 5v buzzer?

Anyway, I soldered the pin headers on, so I can at least try it.

DSCN0542 by Gary Hickling, on Flickr

DSCN0543 by Gary Hickling, on Flickr

Not sure why there are so many pins on this, but I'll look at that as and when I get to it !

OK, see you all later !
« Last Edit: January 13, 2017, 12:59:35 by Scubacrazy »

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Re: Robocat Build Step by step with lots of pics !
« Reply #27 on: January 15, 2017, 13:44:51 »
Right, update time !

Finished connecting and building the first level, which is basically the propulsion part of the quad.
All motors and ESCs are connected to the PDB now.

DSCN0554 by Gary Hickling, on Flickr

As you can see, the ESCs are mounted inside the body, which should offer a bit of protection.

Then, the moment of truth.
Was my soldering any good?
Was there going to be a puff of smoke?

DSCN0555 by Gary Hickling, on Flickr

Apparently not ! Phew, that's always a relief.

As you can see, I knocked up a smokestopper, just to play it safe.
For anyone who doesn't know, a smokestopper is a current limiting device, placed in line between the battery and the quad power in.
It is basically a twin filament car bulb, I used a 12v 21/5W dual filament tail light, which acts as a 2.5A current limiter.
In other words, if there had been any dead short in the circuit, the bulb would have glowed, and stopped the current flowing into the quad, thus saving the electronics from going up in a puff of smoke.

Here is a closer look at the smokestopper.

DSCN0556 by Gary Hickling, on Flickr

Next job is to start on the 2nd level, which is the flight controller, get it all connected up, connect the buzzer, and set it up in cleanflight.

Wish me luck . . . .
And a big thanks to anyone who has actually been bothered to follow this thread.

More will follow !

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Re: Robocat Build Step by step with lots of pics !
« Reply #28 on: January 15, 2017, 19:06:12 »
Looking good. Keep up the build thread.

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Re: Robocat Build Step by step with lots of pics !
« Reply #29 on: January 15, 2017, 19:48:03 »
Definitely a good idear to put your  ESC in the frame
I'm always catching mine with the props when I crash ..
Because there on top of the armes ....