<set_>
There is a listing of a servo motor .py file in it.
<set_>
This gets me closer to understanding the servoCape.
<set_>
Sort of...
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<zmatt>
set_: that stuff isn't really applicable to the servocape
<set_>
I understand now. Okay.
<set_>
No issue...
<set_>
I still like how it describes how to initialize a servo on the BBB in question w/ Python3.
<zmatt>
and why the 0.18s delays? what happens without them? also, what library was that that you were using, it was clearly a different one than mine which you were previously using
<set_>
The delays seem to allow for the servos from the PCA9685 to not kill/shutdown the BBB prematurely.
<set_>
I have not figured it out yet.
<set_>
I am using a lib. from a fellow on the forums.
<zmatt>
oh you mean you're just overloading your power supply? lol
<set_>
I asked him...
<set_>
Right.
<set_>
Somehow.
<set_>
I asked him about managing more than a servo at a time. He wants me to figure it out. So, here I am trying.
<zmatt>
"to not kill/shutdown the BBB prematurely" .. am I understanding correctly that you're seeing the BBB power off or reboot if you omit the delays?
<set_>
yes. the BBB powers off when I run the source w/out the delays.
<set_>
I posted a video the other day. It is the running of eight servos but w/ delays.
<set_>
It runs them fine but not at the same time for whatever reason.
<zmatt>
how are the servos powered?
<set_>
sys_5v and a barrel jack.
<set_>
I tried vdd_5v for powering the ServoCape.
<set_>
But...as I recall, the vdd_5v is for Cape power and not to power the servos from/to the connectors?
<zmatt>
I mean, it doesn't really matter how you power the servos as long as it's the right voltage and can provide enough current... and it sounds like sys_5v can't provide enough current to drive multiple of the servos you're using at once
<set_>
Right. But...on the Cape, it states 5v maximum.
<set_>
Is that not odd?
<zmatt>
is that connector X1 ?
<set_>
Is that connector, the one on the ServoCape, for making another circuit?
<set_>
it says 5v IN Max.
<set_>
It is the only Blue connector on the ServoCape.
<set_>
x1. yes.
<zmatt>
based on the schematic it only appears to go to the servo output headers so I don't see any reason for it to really care about the voltage used
<set_>
Okay.
<zmatt>
it should simply be whatever the servos are expecting
<set_>
I guess I can put more in it and test it.
<set_>
Right.
<zmatt>
but the main issue here is current capability, not voltage
<set_>
i can put 5v w/ a greater A.
<set_>
Right.
<set_>
The servos are listed at a particular 5v @ ______. Please hold. Let me get the info. of these servos.
<set_>
It does not say...
<set_>
Speed : 0.16 sec/60°(5V)
<set_>
So, the barrel jack in its connector on the BBB, will not supply enough amperage or total current to handle all these motors.
<set_>
Dang it.
<set_>
That makes sense.
<set_>
The idea I got was from a maestro controller...
<set_>
But...it was supplied by a large battery for the quadruped.
<set_>
I have another ServoCape on order. So, I will test this one w/ a higher amperage at 5v.
<set_>
This is the first one I got a while back. So, it actually came w/out input headers. So, I can test it.
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<set_>
Okay...so before me is a barrel jack to screw terminal "dongle".
<set_>
I am going to use 5v @ 2A to test first.
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<set_>
Okay...so. Everything is a go. The barrel jack to screw terminal is plugged in and is powering the servos. now, time for some source.
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<set_>
Now...I cannot be certain this happened but I am sure this could have been a cause to me not understanding.
<set_>
I could have had positive on the ServoCape to the GND of the BBB.
<set_>
Argh.
<set_>
I am not sure.
<set_>
I cannot describe now what is going on.
<set_>
So, I set the server to handle angles, right. So, 0, 25, 50, 180, respectively.
<set_>
I put it on 0 w/out the delay.
<set_>
The listed servos inch or move slowly to their destination while the delay helps w/ speed of the servos.
<set_>
So, if I call "0" degrees for the angle, it moves slowly to the angle of 0 degrees but if I call "25" w/ the delay, the servos individually move faster but not simultaneously.
<set_>
I got to tell this fellow about my error. Yikes. I am pretty sure, almost 100% positive, that GND to the BBB was at the positive end of the screw terminal of the ServoCape.
<set_>
Hmm.
<set_>
I think it was set up this way to annoy me on purpose. Someone else was here. Not your issue.
<set_>
Thank you, @zmatt.
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<Guest78>
Hello, is there a documentation or SDK to understand how to use the MMA (fast matrix multiplier) of the beagleboard AI 64 ?
<set_>
Yeppers. 10w is not enough to drive them.
<zmatt>
jkridner: do you have any idea why TI isn't publishing C7x documentation, in constrast to the C6x which has always been well-documented?
<zmatt>
especially since it seems to be positioned to replace the C6x... the J721s2 has dropped the C66 cores and replaced them by another C71 instance
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<set_>
@zmatt: So...yep. No amps and no fast movements so far. I ordered a part. DC-DC converter. Hopefully, this little contraption can alleviate my woes w/ the many servos. It takes in 12v and hands out 5v at 10A max.
<set_>
I should have built it but I am lazy. Blah.
<set_>
Now that I think of it, I already built an amp but it was faulty. I should have rekindled the effects.
<set_>
The only issue was the lack of a pot. I could not control the output...it was a frequency that fluctuated.
<set_>
now what freq, no clue. I should have checked more into it.
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