Quillons, LEDs and Resistors

[Elim Vos]

Hey Everyone,
   I have a few questions about  resistors and the Trident features.

I'm using a PCv4, 7.4v 18650, three tri-Cree Deep Red/Deep Red/White LEDs.
According to the manual I need 4 resistors, 2 for the Quillons DR, 1 for the main Foc and 1 for
the quil's Foc.

the DR for the quil's needs 2x 2.7ohm/10watt (2.5v forward voltage, 2000mA current, 7.4v source voltage)
the "main" white Foc needs 4.7ohm/4.7watt (3.15v FV, 1000mA current, 7.4v SV)
then the quil's Foc needs 2.2ohm/8.8watt (3.15v FV, 2000mA, 7.4v SV)

The main question is will these be the right calculations? I am using led.linear1.org for the calculation.

This is the first time I've used three separate LEDs and resistors, and will be the only one. I don't want to blow the LEDs or the PCv4.

The LEDs are from TCSS so the FV is correct.

Help, Comments and advice are welcome....


Elim

[erv]

It's quite unrealistic to fit a 8W+ resistor, I would split it for each quillon.

Also, I don't understand why you'd want to put that much amps in the quillons.

Third, you can't just say that the Vf is "correct", direct driven leds must be measured first.

[Elim Vos]

Hey everyone,
I'm revisiting the subject after finishing other projects.

I recalculated some things and came up with better resistor values,
I am still using a tri-Cree Dr/Dr/W (only using a single Dr) LED from TCSS,
ASSUMING the forward voltage is correct, and the PEx is 7.4v...

R=(7.4-2.5)/1000  R= 4.9ohm 2.5watt

IF Erv's manual is correct (pg29 and pg42) I connect the Quillon's LED to the on-board PEx chanel 3
according to how I read it only puts out 3.3v...

R=(3.3-2.5)/1000  R= 0.8ohm 2.5watt

Q: 1) Can I round up the ohms? ie: 5ohm and 1ohm.
   2) Are these values more realistic?

I would really appreciate suggestions and comments.

Elim

[erv]

the channel remote control (aka PWM / drive output) is indeed 3.3V / 18mA. The calculation with 7.4V are correct if you're using a 7.4V battery and you can safely round those value

[Elim Vos]

Sorry if I keep asking stupid questions,
 
Am I correct to say the ohms are the important value, meaning can I round up the ohms to 5 ohms and drop the watts to 2watt?

It seems to be almost impossible to find the right resistor.

[erv]

It seems to be almost impossible to find the right resistor.

Drive adjustments are meant for this

[TheUnchosenOne]

Am I correct to say the ohms are the important value, meaning can I round up the ohms to 5 ohms and drop the watts to 2watt?

Ohms are the more important value, and you'll want to be as close to those as possible, but watts are important too, and generally you don't want to be under the value you calculated. For both of them, better to round up.

And as Erv pointed out, if you can get close but not quite there, you can always adjust the drive parameter.

[Don]

Actually a resistor with 4.9 Ohm subject to a current of 1000 mA would dissipate 4.9 W, not 2.5 W.

Considering that a 5W resistor is definitely bulky, I would split the resistor in two, 2.2 Ohm and 2.7 Ohm 3W.
This way the total resistance would remain 4.9 Ohm, but the two resistors will dissipate 2.2 W a,d 2.7W, remaining within the limits of 3W.

When I have to go this way I normally put one resistor on the LED positive wire and the other resistor on the negative.

[Elim Vos]

I know I keep coming back to this (it's been a while)
I want to use as little resistors as I can, and still can't figure this out.

The white (foc) needs 1.41ohm 9.45w resistors
And the Deep Red needs 2.45ohm 5w . Still can't find them on line, and the closest I found at TCSS is 1.5ohm 5w and 2.7ohm 10w.

I hate using the resistors because of this. Can't this be simplified.

Can I use the ones I found at TCSS or keep searching?

[Don]

I think the main problem here is that you are strictly following the suggested wiring diagram in the CF manual.

The diagram is perfect, but I believe it is not the most efficient solution available.
As stated in the manual there are several variants.

If you have room, I would explore the possibility to use one CEX module to drive the quill's led.
This way you can skip resistor calculation for all blades and drop the current if you connect each blade's Red LEDs in series.

CF - Red - Red      (main blade, 1000mA)
CEX ch1 - Red - Red    (quill 1, 1000mA or less)
CEX ch2 - Red - Red    (quill 2, 1000mA or less)

The only resistors needed in this solution are those for the FOC channels.
My preferred solution would be a serial/parallel wiring.

Off a single PEX, I would connect the main blade White in parallel to a the pair of quill's Whites (connected in series).
Something like;

PEX  -  Resistor - Main White
         \  Resistor - Quill White - Quill White
     
This is only one of the possible solutions and others could be prepared, but for sure connecting the LEDs in series is the solution to reduce the Watts required for the resistors.

[Elim Vos]

Okay,

Dr-Dr to main
Dr-Dr to Cex ch1 (one from each quill)
White-white to Cex ch2 (same for Foc)
But can't find where to wire main (Foc) white

Tried the on-board Pex but no joy, then tried channel 3(with the quill Foc) but none of the Foc worked.

Yes, it's properly resistored.
Do I need to wire it to the Cex?

Just a little frustrating.

[erv]

Adjust the foc current of the concerned channel so that its powered during foc

[Elim Vos]

I've changed the settings, still not getting main Foc.

and I was wondering if the settings are okay for the delay

// PCv4 config
led=1000,1000,0
fled=700,700,1000
focmix=111
tridenton=500
tridentoff=0
tridentm=0100
tridentfx=1
tridentflk=50
tridentquick=0
resume=0
shmrd=72
shmrp=6
shmrr=12
shmr%=0,50
focd=200
focp=10
focr=10
foc%=0,50
qon=0
qoff=0
fade=0
flks=4
flkd=24
idlepulsing=1
idleled=0

white Foc from Cex to channel 3, main White to PeX 2. Assuming they are connected...


EDIT: I wired the main White (Foc) to the Cex so all three FoC's are working. Is this going to be a safe sestainable
solution?

Still cant get any delay with these settings.

[Elim Vos]

I got everything working properly,
Now I just need a speaker holder that will fit...wish me luck.

[erv]

No explanation of what was wrong?

In your current list above, you had 3 channels instead of 4