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Old Dec 21, 2011, 12:40 PM
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Thanks simonk, that nailed it. All fet drive and adc feedback verified as bs pinout. Gotta love schematics . I picked this 6A esc because it had atmega8 with 16mhz ext osc and would really like to see it work. Now to come up with some pin probes to make connections.
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Old Dec 21, 2011, 01:10 PM
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manu,

The schematic simon linked to is way easier to look at

Pretty much an exact match other than my esc has combo FET SOIC chip like TC pointed out earlier instead of discreets. Pics of it a little further back in the thread. I am going to try to drive some Hacker micro motors with strong magnets in them so I am expecting startup to be a little rough.

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Originally Posted by alll View Post
Could you post a draft drawing of your findings?
thanks
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Old Dec 21, 2011, 02:06 PM
hacker
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I'm using a DPS-1512M modified to 16.8V max output, which does about 15A, and I'm still able to briefly trip the fault on it when reversing some motors quickly. I think it really needs to brake when switching directions, which means it needs to know the direction in which it is going versus the direction it wants to go.

PPM with RC_PULS_REVERSE defaults to 1000Ás < 1400Ás reverse, 1400Ás - 1500Ás neutral, 1500Ás < 1900Ás forward, so yeah, 1500Ás is not the center. I guess I could move it a bit, but my servo tester only does 980Ás - 1992Ás, so I can't quite test the full range with that. Just checked my old Airtronics XL 2P AM radio (sweet) -- with maxed pots, it sends 1384Ás neutral with centered "brake" trim, 1176Ás full reverse (1064Ás with max reverse trim), 880Ás brake button, 1928Ás full forward (regardless of trim), so this radio at least is quite a bit narrower and lean a bit towards the reverse end. Hmm, I wonder what do newer radios like http://www.hobbyking.com/hobbyking/s...dProduct=12181 do. Does anybody know or have one?

I was going to make POWER_RANGE auto scale with throttle calibration, but I guess for the rev/neutral/fwd case, it might be better off with "mul" scaling. I need to move r0/r1 out of the way anyway as i2c stuff will probably need "mul" to avoid rounding errors.
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Old Dec 21, 2011, 02:42 PM
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Quote:
Originally Posted by jesolins View Post
So who will be the first to try this on a multicopter to see what reversal tricks it can do...besides crashing of course...I can already do that without a thrust reversal capability
Now we just need crash-reversal. I've been wanting to try it on my tricopter, but I haven't been able to find any props that don't have significant scoops, so reverse thrust sucks on most of them. Does anybody know where I can find some just flat propellers, in the 10x5 range? I also tried two props mounted back-to-back, but drag is pretty bad.
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Old Dec 21, 2011, 03:11 PM
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Originally Posted by eosbandi View Post
1. Get one
2. Open it up
3. check processor, connections
4. share
5. if it's atmel based,get code
6. enjoy
I hoped someone else had done that, but it's a good idea.

First i have to wait for my AVR USB programmer and do my RCT 30A.
Never done this
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Old Dec 21, 2011, 06:34 PM
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Quote:
Originally Posted by pug398 View Post
I picked this 6A esc because it had atmega8 with 16mhz ext osc and would really like to see it work.
Can you please tell me what are they and where did you get them?
I'm in desperate need of a bunch of reflashable tiny 6A...
I promise I won't tell anyone.
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Old Dec 21, 2011, 07:31 PM
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Originally Posted by c2po View Post
Can you please tell me what are they and where did you get them?
I'm in desperate need of a bunch of reflashable tiny 6A...
I promise I won't tell anyone.
Just me
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Old Dec 21, 2011, 09:04 PM
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I flashed six rct 30a escs and tried the motor test in MKTools. The start numbers for each motor is different. 1-67, 2-48, 3-57, 4-30, 5-15, 6-55. Any ideas why they are all different?
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Old Dec 21, 2011, 11:19 PM
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Originally Posted by Buffythesaint View Post
I flashed six rct 30a escs and tried the motor test in MKTools. The start numbers for each motor is different. 1-67, 2-48, 3-57, 4-30, 5-15, 6-55. Any ideas why they are all different?
The RCTimer boards have no external resonator, so use the AVR internal RC oscillator, which drifts with voltage (should always be 5V if you are giving it enough on the input) and temperature (will heat up as you are messing with it). See http://www.atmel.com/dyn/resources/p...ts/doc2486.pdf page 268, figure 170)... Temperature is significant, but shouldn't be _that_ much. When calibrating, was there a wide area where lower tried to start but didn't? Or did it just go from nothing to running as you hit that number? Is it consistent if you retest? Also, if you're not using the latest software I posted early this morning, that build might start better. (I've flight/drive-tested it now, seems to work.)
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Old Dec 22, 2011, 12:13 AM
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Originally Posted by Buffythesaint View Post
I flashed six rct 30a escs and tried the motor test in MKTools. The start numbers for each motor is different. 1-67, 2-48, 3-57, 4-30, 5-15, 6-55. Any ideas why they are all different?

Buffythesaint -

Which i2c converter were you using while testing the esc's in MKTools?

Or, instead did you perform surgery on your RCT's (converting them to i2c) prior to flashing the latest code?
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Old Dec 22, 2011, 12:24 AM
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Since there's no usable I2C code, I'm sure he flashed them with the firmware in this thread. I find such HUGE variance a bit hard to believe, I mean, if this was the case with any reflashed RCTimer then how can standard flight controls even begin to deal with this?
I mean, 15 in mktools =~ 1060us, 67 =~ 1270us, a ~200 us difference between would be really obvious on standard FC.
How about swapping the escs around and comparing, does the start point change when you change the esc? Are they all on same fuses/settings/etc? (and physically same, i.e. all intrc or all 16mhz osc etc)
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Old Dec 22, 2011, 07:45 AM
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Does anyone know if this works on the Hoverfly Pro?
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Old Dec 22, 2011, 07:47 AM
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It works on anything that outputs 1000.2000us throttle pulse. Which is: everything.
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Old Dec 22, 2011, 08:13 AM
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Thanks TC
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Old Dec 22, 2011, 08:19 AM
Friend is a 4 letter word...
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Quote:
Originally Posted by timecop View Post
It works on anything that outputs 1000.2000us throttle pulse. Which is: everything.
Actually I believe Xaircraft uses "ultraPWM" which is 200-1200 uS...
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