TinyTwo Speed Controllers

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Hogi
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Re: TinyTwo Speed Controllers

Postby Hogi » Wed Jun 03, 2015 8:19 pm

i'm very glad to see that you are now going to be stocking nanoweight boards Rory. i am indeed interested.
Featherweight under construction.

Antweight to build list: 4Wd lifter, new clusterbot, secret project, walker of some description.

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joey_picus
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Re: TinyTwo Speed Controllers

Postby joey_picus » Wed Jun 03, 2015 8:33 pm

If they come with a Lemon I might be tempted, as much as I like soldering my own odd speedo/reciever combos :)
Joey McConnell-Farber - Team Picus Telerobotics - http://picus.org.uk/ - @joey_picus
"These dreams go on when I close my eyes...every second of the night, I live another life"

Nixon
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Re: TinyTwo Speed Controllers

Postby Nixon » Tue Jun 30, 2015 9:03 am

If I'm plugging an ESC for my EDF into the TinyTwo, do I need to cut the red power line that'd normally power a servo or do I leave that intact?

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EpicentrE
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Re: TinyTwo Speed Controllers

Postby EpicentrE » Tue Jun 30, 2015 9:18 am

The regulated 5-6v supply that a component feeds back to the receiver comes from what is known as a BEC - or battery elimination circuit. You only want to have one active BEC feeding back into the receiver in your system. So if your receiver already has power from the TinyTwo, then yes, you'll want to disconnect the red wire from the 3-pin connector from the ESC to the RX.
Scott Fyfe-Jamieson, Captain of Epic Robotics. Champion of AWS38/41/42.
http://www.epicrobotics.co.uk

Nixon
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Re: TinyTwo Speed Controllers

Postby Nixon » Tue Jun 30, 2015 9:45 am

Thanks Epic :)

Roboteernat
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Re: TinyTwo Speed Controllers

Postby Roboteernat » Tue Jun 30, 2015 10:59 pm

So... I got my stuff out again to build a new antweight, not that I have yet competed with anything, nor built a bot worthy of the arena!

But I plugged in my N2LVHP board to a 2s 350mah zippy lipo and smoke started to appear... I strip the heat shrink back to see if there is damage and although I cannot see any, the smoke is coming from the central side of the lower motor controller chip on one side.

Will check the wiring but I don't think it's a shorting issue, although the black wires sheath has shrunk with the heat...

IS there a likelihood I can repair it? I cannot trace the chip Used to perform a repair... Sad as it's not really been used much, and no battles!

And an action picture! https://flic.kr/p/v8KV2R
Some projects done: Wirelessly controlled mechanical hand/arm
Short Circuit: Robot Wars Series 6
Antweight robot : in production
Check out http://www.Roboteernat.co.uk for more details

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Rapidrory
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Re: TinyTwo Speed Controllers

Postby Rapidrory » Wed Jul 01, 2015 10:49 pm

Yeah, I'm afraid that appears to be a problem with the HP version of the controllers; I've had 3 reported to die like that in the last few months (compared to almost no dead regular N2LVs despite having sold more)

If you're not running 4 HP motors then the HP controller isn't actually needed. You can convert it to an LP controller by removing both the chips from the dead side, and then take the top chip off the working side and solder it in place of the dead chips. Quite a fiddly job, but can be done if you use a pair of tweezers... If it doesn't work I'm afraid you'll have to ship it back to me for repairs; the driver chips are only available through one supplier direct from china in batches of at least 200.
Rory Mangles - Team Mangler

Robots: Too Many...

NanoTwo antweight speed controllers. (viewtopic.php?f=1&t=2128)

Roboteernat
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Re: TinyTwo Speed Controllers

Postby Roboteernat » Thu Jul 02, 2015 8:04 pm

Hi Rory, thanks for getting back, do you know what it could be the cause, if it's the drivers themselves or the negative wire just touching the positive side of the capacitor in between as the heat causes the wire sheath to creep?

I'd like to get it repaired so I can use it again, will check the specs of the lower one to see if it will be ok, as I'm only using them for 2motor bot atm, but got the 4 for future upgrades, I have the kit, but if it's too fiddly how much would it be to get to get you to repair for me?

Thanks
Some projects done: Wirelessly controlled mechanical hand/arm
Short Circuit: Robot Wars Series 6
Antweight robot : in production
Check out http://www.Roboteernat.co.uk for more details

Roboteernat
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Re: TinyTwo Speed Controllers

Postby Roboteernat » Mon Jul 06, 2015 3:41 pm

I took off the motor controller chips and took one from the other side making it the lower powered version, still shall be adequate for my needs...

Here are some images from the take apart, shows the lower chip seems to have suffered a heat failure, possibly due to the piggyback nature of the chips.
Also it could be that the negative wire had been heated against the chip, melting the protective coating and shorting out, causing the chip to blow, although this is far less likely option.

https://flic.kr/p/vC7cZY
https://flic.kr/p/uHpaPs

And the final board:
https://flic.kr/p/vnQtkY

Looking forward to getting my new bot built. Will let you know Rory how it goes and if it is still working, otherwise i may have to send it back to you for repair :) or buy a new one!
Cheers
Some projects done: Wirelessly controlled mechanical hand/arm
Short Circuit: Robot Wars Series 6
Antweight robot : in production
Check out http://www.Roboteernat.co.uk for more details

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Rapidrory
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Re: TinyTwo Speed Controllers

Postby Rapidrory » Mon Jul 06, 2015 4:27 pm

Ah well done on getting the mod to work :)

Yeah not entirely sure what it is that causes them to die, whether it's the chips somehow getting out of sync with the other one, with one driving high and the other driving low or whatever.. It's unlikely to be heat related as they have thermal shut off that should prevent that.. Either way I have barely sold any of those boards, so may well discontinue them except in exceptional circumstances..
Rory Mangles - Team Mangler

Robots: Too Many...

NanoTwo antweight speed controllers. (viewtopic.php?f=1&t=2128)

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Rapidrory
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Re: TinyTwo Speed Controllers

Postby Rapidrory » Wed Sep 23, 2015 10:59 pm

I've finally got around to rewriting the firmware for my ESCs (Something I've been meaning to do for about a year). The main improvements are that it now has 1024 discrete speeds rather than the previous 32, and it now reaches full speed at about 90% stick travel rather than 75%. This makes for smoother and more precise control, though having driven with my previous firmware on all my bots it's going to take some getting used to! I'm going to upload it to a few of my bots and try it out at the weekend to see how it performs in a contest, then if there's no issues I'll switch to using the new version for all new ESCs.

On a related note I've just moved into a new house at uni which so far lacks any proper work bench, and I have quite a backlog of orders, so any new orders might take a while to complete at the moment.
Rory Mangles - Team Mangler

Robots: Too Many...

NanoTwo antweight speed controllers. (viewtopic.php?f=1&t=2128)

Roboteernat
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Re: TinyTwo Speed Controllers

Postby Roboteernat » Thu Oct 01, 2015 10:12 am

Sounds good RapidRory,
are we able to get the new firmware into previously bought controllers? perhaps a prepaid envelope or something to you?

Thanks

Nat
Some projects done: Wirelessly controlled mechanical hand/arm
Short Circuit: Robot Wars Series 6
Antweight robot : in production
Check out http://www.Roboteernat.co.uk for more details

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Rapidrory
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Re: TinyTwo Speed Controllers

Postby Rapidrory » Sat Mar 19, 2016 4:09 pm

Just coming to the last of the 200 NanoTwo ESC PCBs that I originally got made. Since I'll soon need to send off for a load more, I was wondering if there are any changes to be made in the design.

The main one I'm considering is dropping the 6v regulator in favour of a 5v regulator. The 6v regulator was originally put in to get the best power out of servos, but considering most people now use 7.4v servos if they want a powerful flipper, then the benefit of having a 6v line becomes somewhat moot, especially since it adds 5 extra components to the board to get it to work. The 5v reg would still be able to drive servos fine, just with a little less force.

I'll also probably make a few extra tweaks to make them easier to built/ more robust. Just wondering if anyone had any other suggestions for improvements?
Rory Mangles - Team Mangler

Robots: Too Many...

NanoTwo antweight speed controllers. (viewtopic.php?f=1&t=2128)

Max
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Re: TinyTwo Speed Controllers

Postby Max » Sat Mar 19, 2016 6:22 pm

Maybe it isn't an issue for other people but I felt easier access to the full unregulated battery power would be useful. ie a set of pads parallel to the battery connection to solder on wires for brushless escs, servos etc.

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Rapidrory
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Re: TinyTwo Speed Controllers

Postby Rapidrory » Sat Mar 19, 2016 11:40 pm

Not a bad shout... I was considering making it so that the BEC could be dropped out giving 7.4v on the RX pins, which would allow for HV servos, but not sure about how I'd do something easily for brushless ESCs... I'll look into it though.
Rory Mangles - Team Mangler

Robots: Too Many...

NanoTwo antweight speed controllers. (viewtopic.php?f=1&t=2128)


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