TinyTwo Speed Controllers

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Hogi
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Re: TinyTwo Speed Controllers

Post by Hogi »

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

Team Hectic.

Many antweights

Super antweights: territorial.

Fleaweights: fleadom fighter, gaztons.

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joey_picus
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Re: TinyTwo Speed Controllers

Post by joey_picus »

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

Post by Nixon »

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?
EpicentrE
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Re: TinyTwo Speed Controllers

Post by EpicentrE »

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

Post by Nixon »

Thanks Epic :)
Roboteernat
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Re: TinyTwo Speed Controllers

Post by Roboteernat »

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
Heavyweight: Short Circuit
Antweight robot : Locking wheel nuts, dell-apidated bANTtry...
Featherweight : Wanna Choppa, CASPer
Check out http://www.Roboteernat.co.uk for more details
Rapidrory
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Re: TinyTwo Speed Controllers

Post by Rapidrory »

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 Nuts

Robots: Nuts 2 and many more...

NanoTwo Motor Controllers: https://nutsandbots.co.uk/product/nanotwodualesc
Roboteernat
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Re: TinyTwo Speed Controllers

Post by Roboteernat »

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
Heavyweight: Short Circuit
Antweight robot : Locking wheel nuts, dell-apidated bANTtry...
Featherweight : Wanna Choppa, CASPer
Check out http://www.Roboteernat.co.uk for more details
Roboteernat
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Re: TinyTwo Speed Controllers

Post by Roboteernat »

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
Heavyweight: Short Circuit
Antweight robot : Locking wheel nuts, dell-apidated bANTtry...
Featherweight : Wanna Choppa, CASPer
Check out http://www.Roboteernat.co.uk for more details
Rapidrory
Posts: 1160
Joined: Sun Nov 24, 2013 9:54 pm

Re: TinyTwo Speed Controllers

Post by Rapidrory »

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 Nuts

Robots: Nuts 2 and many more...

NanoTwo Motor Controllers: https://nutsandbots.co.uk/product/nanotwodualesc
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