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 Alex's Melty Project

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Alex
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PostSubject: Alex's Melty Project    Fri Oct 15, 2010 9:30 am

So I decided to cave in and start on a melty. I talked to RJW and he provided me with a lot of information. I was up pretty late (3am) reading all of the "open melt" stuff.

Instead of going all out and building a 12# melty, I am going to start with a small antweight size test platform. I would love to anyone's input on what they think. Here is my rough parts breakdown for the test platform:

Fancy Electronics:
-Baby Orangutan B-328 + USB AVR Programmer Combo --- $32
-Single Axis Accelerometer Breakout Board - ADXL193 +/-250g --- $30
-Darlington MJ11032G --- 2 @ $8.94

Basics Robot Stuff:
-Hub---MPI Prop Adapter - 2.3mm ---2 @ $5
-2 1/4 Inch Diameter Lite Flite Wheel 2pk --- $5
-Electrifly Speed 280 --- 2 @ $8
-Laser cut base plate --- $(a bribe to someone at plum)
-1250mAh 2S 7.4V 20C LiPo Elfite Battery --- $17
-Some sort of Spektrum Radio. Does the radio need mixing? So probably DX 3s with sr3000 rx.
Other stuff:
There will been the need of other bits and bots, but I think for the most part that is everything.

My planned 12/15 version will use a brushless drive and most likely will asymetrical.

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PostSubject: Re: Alex's Melty Project    Fri Oct 15, 2010 9:39 am

I'm thinking the fets are a bit overkill, but to be honest I really don't know!

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PostSubject: Re: Alex's Melty Project    Fri Oct 15, 2010 9:48 am

I guess that you are going to start with wheels on motor shaft.

small fets are way more efficient then the Darlingtons...they are heavy and heat monsters.

the sparkfun led's (rebels) are very bright and around $5 each....

you could get away with a lot cheaper, but they scale very well...I use the same ones in my 1,3 and 12

find, download and install avr studio (i think 4) . it requires xp sp3 or something. another freebee is winavr with programmer's notepad.

It's all freebee stuff...

Rich Olson's code requires only a basic radio setup, no mixes... (3 channel)

Mind you, inverted op = fwd/rev is backwards, which mixing can fix.

I am off in a direction that will require some extra channels, switches and possibly mixes.

Don't you already have a dx6i and receiver?

remember that a single wheel melty will self balance. a conventional 2 wheel will require very good balancing.

Show us your cad, so we can critique


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PostSubject: Re: Alex's Melty Project    Fri Oct 15, 2010 10:36 am

I really like the idea of having it have dual modes, ie, translating and tank steeting.

Are there any fets you would recommend? I am really a compete noob with it comes to that sort of stuff.

I do have a DX6i, Dx3r, dx3s, dx6 and dx5e, . I always had issues binding the dx6i to the br6000's though, but I guess they have new receivers out that fix that though.

I never though about a single wheel self ballencing, but I guess your right. It just seems like there is more potential with 2 wd though. Especially if you get your project working Razz

Remember who doesn't have solid works yet. All I have cadded is the rough 2d platform for the test bot.

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PostSubject: Re: Alex's Melty Project    Fri Oct 15, 2010 11:14 am

I have a ton of fets that worked and somethat I was going to test, but any fet npn with a logic level gate will do.

If I can dig some out, I'll give em to you....they require a diode and possibly a resistor on the gate...it' been so long, that I don;t remember.

but for your test platform, if are using small motors ...low current and can aford trhe darlingtons, they'll work fine (try to heat sink them

the tank drive is still a pie in the sky, but I am working on it

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PostSubject: Re: Alex's Melty Project    Fri Oct 15, 2010 11:18 am

on a side note my ant fought nearly the whol event on 1 wheel drive....I didn;t even bother to investigate, but it was probably an esc that went south, in that one wheel pulley was totallt oor and I never bothered to make a new one.

also 2wd spins up a lot faster

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PostSubject: Re: Alex's Melty Project    Fri Oct 15, 2010 11:18 am

So how hard is it to go from brushed to brushless?

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PostSubject: Re: Alex's Melty Project    Fri Oct 15, 2010 11:22 am

also, weed therough the melty facts and take em with a grain of salt.

Colsons actually turned out to be too soft on wood.....(preformas) they all wore down pretty quickly, especially on the 12....

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PostSubject: Re: Alex's Melty Project    Fri Oct 15, 2010 12:59 pm

Placed my polou order.

Alright about to place my Mouser Order. Just wanted to check:

Here is what I got so far:
-Diodes-1N4007 Mouser # 512-1N4007
-Resistors: Metal Film Resistors - 100ohms 1/4w (I can use 1/4w right?) Mouser # 660-MF1/4D52R1000F
-Transistor: TIP142 these are 10 amp NPN Mouser #511-TIP142

I think that's all the components i need minus the led stuff. Right?

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PostSubject: Re: Alex's Melty Project    Fri Oct 15, 2010 1:06 pm

Alex Udanis wrote:
So how hard is it to go from brushed to brushless?

until I find another board, it requires 1 tricky solder onto a .009" diameter wire in a small hole and 1 other onto an existing pin...

and a change to my code...until either Rich or someone else comes up with a version...then there will be options.

Outside of that, 1 pair of compatible escs and brushless motors..preferably escs with a bec built in

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PostSubject: Re: Alex's Melty Project    Fri Oct 15, 2010 1:10 pm

Alex Udanis wrote:
Placed my polou order.

Alright about to place my Mouser Order. Just wanted to check:

Here is what I got so far:
-Diodes-1N4007 Mouser # 512-1N4007
-Resistors: Metal Film Resistors - 100ohms 1/4w (I can use 1/4w right?) Mouser # 660-MF1/4D52R1000F
-Transistor: TIP142 these are 10 amp NPN Mouser #511-TIP142

I think that's all the components i need minus the led stuff. Right?

if you are buying Darlingtons, then you don;t need the diodes...they're built in, but you'll need the 100 ohm resistors .

if you went thru the list and that's it then you're ok


are you going to use a bec or a voltage regulattor?

also, you'll need a resistor for each led .

Rich has a link to accel calcs and led resistor calcs on his site (open melt)

Just remember that the baby o board takes no power except for the leds, so you can;t go over 1 amp or you'll cook the onboard H bridge

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Last edited by rjw on Fri Oct 15, 2010 1:11 pm; edited 1 time in total
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PostSubject: Re: Alex's Melty Project    Fri Oct 15, 2010 1:10 pm

rjw wrote:
Alex Udanis wrote:
So how hard is it to go from brushed to brushless?

until I find another board, it requires 1 tricky solder onto a .009" diameter wire in a small hole and 1 other onto an existing pin...

and a change to my code...until either Rich or someone else comes up with a version...then there will be options.

Outside of that, 1 pair of compatible escs and brushless motors..preferably escs with a bec built in

Oh alright. Doesn't sound all that bad. That I think would make a crazy 12# or 15#. You could really tear stuff up.

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PostSubject: Re: Alex's Melty Project    Fri Oct 15, 2010 1:15 pm

rjw wrote:

if you are buying Darlingtons, then you don;t need the diodes...they're built in, but you'll need the 100 ohm resistors .

if you went thru the list and that's it then you're ok


are you going to use a bec or a voltage regulattor?

also, you'll need a resistor for each led .

Rich has a link to accel calcs and led resistor calcs on his site (open melt)

Just remember that the baby o board takes no power except for the leds, so you can;t go over 1 amp or you'll cook the onboard H bridge

I was going off this this diagram and It has diodes across the motors? http://www.nothinglabs.com/openmelt/meltykytkenta.png

Yeah I think that's it. It seemed a lot more complex a week ago lol
I have a cc bec floating around.

The 1 amp warning, is that just saying don't run huge led's? Isn't the led's the only thing that the main board is sending power too?

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PostSubject: Re: Alex's Melty Project    Fri Oct 15, 2010 1:22 pm

that is Pertu 's diagram and he is NOT using Darlingtons, just simple fets.

If you buy fets , then yes, you need he diodes and I think other gate resistors

If you guy Darlingtons, they have a built in diode and you use Rich's diagram...what are you ordering????

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PostSubject: Re: Alex's Melty Project    Fri Oct 15, 2010 1:26 pm

rjw wrote:
that is Pertu 's diagram and he is NOT using Darlingtons, just simple fets.

If you buy fets , then yes, you need he diodes and I think other gate resistors

If you guy Darlingtons, they have a built in diode and you use Rich's diagram...what are you ordering????

Well it's in the "Darlington Transistors" category. Looking at the data sheet it shows a diode built in. Your right lol.

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