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<set_>
Believe it or not, GenTooMan, I am still trying to fly right w/ the BBBlue. Argh...
<set_>
I am compiling a new bunch of their source. Hopefully, this is the match maker!
<set_>
I see some interesting things happening in the RISC-V world and soon...
<set_>
Anyway, I thought I would blab a bit.
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<GenTooMan>
speak of the set_
<set_>
GenTooMan!
<set_>
Huh uh!
<set_>
Ha.
<set_>
Up, up, and OTay!
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<GenTooMan>
live set_ or is that set_ live?
<set_>
Um...either? What are you discussing here?
<set_>
I just got back. I am glad you are here...
<set_>
Does the Servo Header on the BBBlue have a 5v supply on the positive pins?
<set_>
I can test it. Do not fret.
<set_>
I just had a receiver plugged into the BBBlue Servo Header. It was powered and now notta. Poof, like that. No power.
<set_>
It is almost like the BBBlue is picking which of the positive pins on the Servo Header to allow the 5v output.
<set_>
It seems odd. Anyway...I am fed up to the brim w/ ArduPilot for now. The further I get, the more issues accumulate. There is no cure!
<set_>
And...
<set_>
GenTooMan: what is "live set_ && set_ live"?
<set_>
Did you see a video of me complaining again?
* GenTooMan
avoids videos of people whining. "Isn't their documentation for the connectors on the BBlue? Schematic might be helpful.
<set_>
Oh!
<set_>
Good idea!
* set_
says GenTooMan hates my pitty party!
<set_>
"My toe hurts!"
<set_>
Off to the schematic...
<ogra>
of your toe ?
<set_>
No.
<set_>
Of the BBBlue.
* GenTooMan
goes looking for a toe schematic.
<set_>
Okay. There is a 6v regulator. and some other doo-dads and then some resistors.
<set_>
3.6 uH inductor?
<set_>
Hmm. Off to research this idea.
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<set_>
Okay. Yes. There is a 3.6 uH (Henry) inductor from the 6v reg. to the pwr/positive of the servo headers and then there is a 4.7k ohm resistor on each of the three pin headers.
* set_
tells GenTooMan to not look up cadaver toes for schematics and to help w/ the math portion of how to relay this info. into a possibility.
<set_>
GenTooMan: I only have so much knowledge on the math portions of the electrical field ideas.
<set_>
Wait!
<set_>
DO not tell me
<set_>
I am finding worksheets online.
<set_>
Is there an inductor on the BBBlue at all?
<set_>
I just looked over the board...Oh! The backside.
<set_>
Wait...is the AOZ1284 all one piece?
<set_>
Okay. No issue.
<set_>
I am done for now. The BBBlue works. I know this idea is true.
<set_>
No more from me. Squeaking for now until later!
<set_>
That 6v reg. is no joke.
<set_>
I got the datasheet open. Man, this is blowing my mind on how complicated this tiny piece of circuitry actually is now.
<set_>
I will need more time!
<GenTooMan>
I doubt an inductor is all that important. Perhaps you should look at the nets things attach too instead?
<set_>
Okay. I was just trying to figure out how 7.4v going into the 6v reg. would end up after the 3.6uH inductor. Then, I could probably figure out how the 4.7k ohms resistors work their way into the mix.
<set_>
But...
<set_>
I guess I can attempt to see the output voltage on the servo header on positive/GND and then see my dumaflachee minimum voltage.
<set_>
This is by far much simpler but I will know less. Therefore, either way is awesome as I yell, "Turn ON!"
<GenTooMan>
so I assume the servo type your were refering to is an RC servo. Those draw approximately 30-200ma sometimes a lot more. It is unlikely they would be feeding power through 4.7k resistors for that.
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<set_>
Yep. I saw the schematic and it shows a 4.7k resistor on the board right before the positive pin or maybe another pin (signal <- whatever that is).
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<set_>
Hey...I am actually powering a receiver from this Servo Header (Positive and GND).
<set_>
I am messing w/ the ArduPilot stuff still and trying to get things kickin'.
<set_>
Oh! and...
<set_>
Just to say this idea: People from LA stink. There.
<set_>
I just spent this entire time cleaning out my nice, pristine gutters!
<set_>
Supper is ready!
<set_>
All fun aside, what is the...Oh! So, maybe the amount of draw from the receiver killed off some pins on the BBBlue?
<set_>
This one came to me w/ four pins bent and some doctoring up of the circuitry. It looks like a person, a real human, soldered it w/ a special technique.
<set_>
So, maybe-maybe-maybe.
<set_>
I will get the datasheet on it real quickly.
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<set_>
100 mA at 5v
<set_>
That is my 'draw' from the receiver. So, if I am taking in, if the draw is 100 mA, that amount at 5v, I should have only 400 mA more to use for the BBBlue?
<set_>
Let me check.
<set_>
Well...I did not find what I need but I found what I want!
<set_>
Rev. C!
<set_>
It has a am335x right. So, from that point forward, the older BBBlue, I would have to figure out what the PMIC can allow for draw/current?
<set_>
So, the servo header is 6v. Okay.
<GenTooMan>
it makes ense the servo power is 6V as many medium sized servos can handle that.
<set_>
Oh. Well, my receiver can handle it too. Do you think you may know how to and how not to receive power from that Servo Header?
<set_>
I thought it was one GPIO pin that needs to be high?
<set_>
So, I run the, via a shell script, commands on boot via a .service file and everything is dandy. Nothing seems awkward. But! It is finicky.
<set_>
On/Off/On and so on.
<set_>
Anyway...I should keep testing before I flip out. Ha.
<GenTooMan>
you can tell from the schematic also.
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<set_>
B/c of the 6v reg?
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<set_>
And...b/c of the 125 mA drawn from the receiver, my ESCs on the signal pins on the Servo header along w/ the other built-in components like the compass and "stuff" all may draw too much mA per BBBlue.
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<set_>
Although, they are not generic, I will never be able to find the correct docs. on these specific motor controllers for mA usage.
<set_>
Hmm. 20A * 4 is what the thing, the ESC, says on it. But...no datasheet. So, 80A * 7.4v = 592w? Does this sound feasible?
<set_>
Hey...sorry for taking up all this space for these ideas you all already understand but! Does ~600watts of power sound like a testable entity for me?
<set_>
and if so, how would I go about testing this ~600w?
<set_>
Cough. I was in the generic ohms law. Sorry.
<set_>
Okay...~600w. I feel as though I am missing somethin'. GenTooMan: yes or no, does ~600w of power come from 80A of ESCs and a 7.4v LiPo? I know you guys are more educated in this field. I am limpin' on a limb here...
<GenTooMan>
I^2*R loss for the FETs
<set_>
or is it (20A / 7.4v) * 4 = x?
<set_>
Okay.
<vagrantc>
having run off of 400W of solar panels really rescaled my understanding of "a lot of power"
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<vagrantc>
anything above 100W seems like a lot to me :)
<set_>
Okay. Thank you.
<set_>
I am breathing again.
<GenTooMan>
the 400W is relative to the current voltage peek curve of the panel
<vagrantc>
that said, no domain specific knowledge about what you're doing :)
<set_>
Oh. I am just making this BBBLue fly.
<vagrantc>
"just"
<set_>
I know.
<set_>
It is a big deal.
<set_>
But...I have been trying to accomplish this task for a 'bit.'
<vagrantc>
a small helium baloon ought to make most SBCs fly!
<GenTooMan>
set_, start off with a infinite source of power (power supply)
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<set_>
I have some three phase motors...
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<set_>
GenTooMan: Okay.
<set_>
so total power. Okay.
<set_>
~600w or 10.81w
<GenTooMan>
no see what power is needed to flow with the ESC you have.
<GenTooMan>
to fly not "to flow" LOL
<set_>
Oh. Okay. 7.4v!
<GenTooMan>
that's VOLTAGE NOT POWER
<set_>
Oops. 10.81w
<set_>
Yell louder!
<set_>
Ha.
<vagrantc>
~10w of what?
<set_>
10w of power/wattage
<vagrantc>
at 7.4v ? so, just a little over 1 watt?
<vagrantc>
er, 1 amp, sorry
<set_>
Yes.
<set_>
Oops. Yes.
<set_>
No issue. I am full of mistakes. Momma always said ______.
<vagrantc>
i'd guess that 20A * 4 that your ESC said is ... the maximum output?
<set_>
Hmm.
<set_>
I am not sure.
<vagrantc>
does this control power by regulating the voltage supplied to the motors?
<set_>
yes. more or less. I can put a two cell up to a four cell on it.
<vagrantc>
are the motors on/off, or do they have variable speed?
<set_>
i.e. I am speakin' of the ESCs still. They control the something or other to the motors. Variable.
<set_>
Well, when I started them as I calibrated them, they would run partially if the gimbal on my control/transmitter was centered.
<set_>
I can control the speed of the motors slightly.
<set_>
It is a very dangerous bot so far.
<set_>
I am scared of it but nevertheless, I want to make it to the sky w/ it.
<set_>
vagrantc: I think the (20A / 7.4v) = 10.81w is the normal attempt at ohms law for DC.
<vagrantc>
normally it's volts * amps = watts
<set_>
My math got confused. Sorry: (20A / 7.4v) * 4 = 10.81. So, volts * amps = watts. Okay, 7.4v * 80A = ~600w?
<vagrantc>
yeah, a little under 600W
<set_>
Seems normal right b/c there are four ESCs at 20A each?
<set_>
And vagrantc... About your earlier question about the maximum output of the ESCs. I think the max is over 20A.
<set_>
For spikes.
<vagrantc>
or maybe maximum continuous load? (e.g. spikes should generally be brief)
<set_>
I guess, I currently have not been in a purchase agreement w/ a ESC mfg. that has had a datasheet.
<set_>
I might have to up my 'game.'
<vagrantc>
yeah, having good documentation might help :)
<set_>
Right!
<set_>
Well, lessoned learned. Now, I can move on in peace.
<set_>
No more undocumented ESC purchases. Thank you.
<set_>
I actually read an interesting read a while back about this fellow describing how to put a ESC together.
<set_>
discrete here and there and then some switches.
<set_>
GenTooMan told me not to reinvent the ESC but I may try to make one another day.
<set_>
Who knows?
<set_>
I just wonder something and I am hurt for not knowing. Do ESCs have actual programmable chips in them or do they not?
<set_>
Or maybe they only have so many functions. Hmm. Oh well.
<vagrantc>
i've never used motors, only experimented abusing the hardware to regulate the wattage of a heating element ... and spectacularly killed a pocketbeagle in the process
<set_>
Yep. It seems they, these ESCs, have to be able to handle a signal. So, some of them, maybe most of them, have a microcontroller in them.
<set_>
Ouch!
* vagrantc
will use cheaper microcontrollers for future experimentation
<set_>
ha.
<set_>
It is hard to replace a nice board after it is broken in.
<set_>
Well, right now, I have a BBBlue w/ a Servo Header intact, along w/ a "I-Do-Not-Want-To-Turn-On" receiver, and power b/c LiPo batteries hold and replenish their charge easily.
<set_>
Thank you bbb.io!
<set_>
I am talking about the LiPo attachment.
* set_
thinks of what exactly or in which field I would be in right now if I was not trying to fly w/ the BBBlue.
* set_
field actually means a field w/ grass and dirt.
<vagrantc>
can your LiPo actually handle that kind of load?
<vagrantc>
if you're really talking about running ~600W of equipment ... that would need a pretty powerful battery
<set_>
Oh. See, this is why I think it is not the (20A * 4) / 7.4v = x. I think it has to be (20A / 7.4v) * 4 = x.
<set_>
But...I cannot be sure. B/c getting ohms law states one thing but there are many circuits in b/t the A and v.
<set_>
My math. SOrry.
<set_>
The first of those equations should have gone like this: 20A * 7.4v = x.
<set_>
Dang it. Bad math again. 80A * 7.4v. There. sheesh.
<vagrantc>
well, something operating at 20A * 7.4v = 148w ... and if you have four somethings ... * 4 ...
<set_>
But...that is incorrect, right? ~600 seems outlandish.
<set_>
for a tiny flying BBBlue? ~600w would push a speaker to annoying levels. Like those cars that pass, i.e. Boom, Boom, Boom.
<vagrantc>
i would guess 20A might be some other value, then
<set_>
See.
<vagrantc>
the voltage of your battery pack is definitely 7.4v?
<set_>
Why are they saying 20 amperes * 4. yes. Well..
<vagrantc>
do your motors have any specs as to what they draw?
<vagrantc>
or what resistance they are...
<set_>
Battery is S2, two cell, 7.4v but discharges at a higher voltage when fully charged.
<set_>
In kelvins?
<set_>
Let me check.
<vagrantc>
nominal 7.4v ?
<set_>
yes.
<vagrantc>
so two 3.7v LiPo cells, what amp-hours or watt-hours are they rated for?
<set_>
Oh. 30c at 2200mA.
<vagrantc>
i don't think you mean temperature relative to absolute zero or color temperature :)
<set_>
Let me go and look up something.
<set_>
right.
<set_>
I mean kv. I think I was fooled by the kv.
<vagrantc>
"30c" is how much times the standard discharge rate you can spike to, if i recall correctly...
<set_>
Hmm. W/ these questions, I have a lot of work to do...I better read up more.
<set_>
Hmm. That makes me think I could be botching things already.
<vagrantc>
2200mAH? e.g. hours
<vagrantc>
a.k.a. 2.2 Amp Hours
<set_>
Yes.
<vagrantc>
or, consistantly draw 2.2 amps for one hour, of 4.4 amps for 0.5 hours, etc.
<set_>
The Kv rating of a brushless motor is the ratio of the motor’s unloaded rpm to the peak voltage on the wires connected to the coils <<< This is what rotordronepro.com says...
<set_>
vargrantc: I will read the sparkfun site later. I see there is a nice set of joules and seconds to behold!
<set_>
I scroll their site from time to time.
<set_>
They have simplistic approaches to complicated terminology. Things seem simple but really get complicated quickly.
<set_>
For me, at least.
<vagrantc>
yeah, it's almost like the world is constructed out of complicated things!
<set_>
Me neither. But these three phase motors, Ha, keep putting this kv marking on them.
* vagrantc
sticks to plain ol DC
<set_>
Hey...
<set_>
I got a DC motor. Generic, of course, but has kick. Do you know how to find the real DC rating of the motor if it has not documentation?
<set_>
I always here of these motor testers...
<set_>
For testing specific qualities of motors, i.e. specific motors.
<set_>
For instance, why allow a faulty motor to work until it dies if one can fix it?
<set_>
For instance, these motor repair shops for cars...if a keen eye was on it, that motor could have been fixed and known to be faulty. Motors are expensive.
<set_>
Insurance!
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