BEC and Light Kit

[99crawler]

Hello all,

I have a high torque servo (solar) that I am going need a bec for. I also want to experiment with a light system from hobby people (trying to keep cost lows). The light system has the servo connection go through a Y harness. I was looking at getting the Holmes bypass connector for the bec to reduce rework on my part.

Question, if I use the bypass connector and the Y harness for the lights, am I risking an issue down the road with all of these connections into one port? It would be bypass adapter into rx, one connector for bec and the other for the light system. From the light system Y, the servo connection and the other end to actual light controller. Hope this makes sense.

Appreciate the time.

 

[ninja turtle]

I'm a little confused on your setup. The bypass adaptor gets the bec and servo in one end and the other goes to the Rx. Are you asking if you can plug a Y in the bypass, like where you would plug the servo into one end of the Y, your light system into the other side, then plug that into the bypass?

What voltage does your light system need?

 

[99crawler]

Correct. The instructions say it can be used at 4.8-6.0.

And that was a lot better explanation of the wiring system is am thinking.

 

[ninja turtle]

And you going to run the servo at 6v too? If so, I don't see why you couldn't run it that way. It's not how I would do it though.

Even with that all plugged in that way the only thing going to the Rx is the signal wire and ground so it shouldn't be a problem.

How many channels on your Rx?

 

[99crawler]

My guess is run the servo at whatever it requires. Being that it is a high torque, I have read I will need a bec. I take it the servo will run at 7.4 and require the bec. I did test the servo without the bec and worked fine. I am sure when I do heavy throttle and servo use I will probably brown out.

The rx is a 3 ch. Sounds like a 4 or greater channel may be best for this application.

 

[ninja turtle]

What are you using the 3rd channel for? If it was me, id run the bec at 7.4 in to the bypass with only the servo. Then use a Y in the 3rd channel ( if it's already being used) for the lights.

 

[99crawler]

My bad. Should have mentioned that the lights are the ones that blink when you turn left/right, light up when brake/reverse.

If they were standard lights, yes the third channel would work.

 

[ninja turtle]

My bad. Should have mentioned that the lights are the ones that blink when you turn left/right, light up when brake/reverse.

If they were standard lights, yes the third channel would work.

Ahhh ok. Could you post a pic of this light setup or a link?

 

[99crawler]

HobbyPeople Instruction PDF Photo by erniesfotos | Photobucket


Hope this works. It is only part of the instruction manual.

 

[ninja turtle]

Ok, so you need Y's on the esc and servo to power and signal the controller. Problem is you are going to run the servo at 7.4v which will be to much for the controller.

I'm sure there is a way to make this work but I don't know how. Maybe make another Y off of the esc and remove the signal wire and add the signal wire from the servo? So the esc would have 3 plugs, 2 with all 3 wires and 1 with no signal wire. The 2 with all three wires would go to the Rx and the light controller in the esc spot. Then take the 3rd esc plug with the signal wire removed and add the servo Y, that is just a signal wire into the servo spot on the light controller.

Like I said, I have no idea if that will work but it's where I would start if I was trying to make this work. Hopefully somebody who knows what the hell they are doing will chime in.

 

[99crawler]

I was afraid of that.

I truly appreciate you taking time to provide feedback. Hopefully someone has ran into this.

Thanks

 

[ninja turtle]

No problem. Wish I could have helped lol.

 

[drzoo2]

See if my thread helps you as I built a home brew light module using using an Arduino as a base. The functions are identical with a similar setup. On mobile now so I will look the thread over better tonight

http://www.rccrawler.com/forum/showthread.php?t=520838

 

[ninja turtle]

See if my thread helps you as I built a home brew light module using using an Arduino as a base. The functions are identical with a similar setup. On mobile now so I will look the thread over better tonight

Arduino based scale LED lighting - Wraith - RCCrawler

Nice! So all he needs to do is cut the red wire on the servo Y going to the controller and the power from the esc Y will power everything.

 

[drzoo2]

Nice! So all he needs to do is cut the red wire on the servo Y going to the controller and the power from the esc Y will power everything.

Yes, Use the "internal BEC" on the ESC to power the LEDs and the receiver leaving the "external BEC" to to power the servo only. This will allow the ability to use a Castle BEC set at 7.4v for the D772, and full speed/torque.

The amount of current needed to power the receiver and LEDs is negligible....I would say at most 200-300mA. The internal will have no issues.

You don't have to cut the wire. Just lift the tab on the JST connector and slide the terminal out. You may need another short Y-harness to accomplish running the Servo only on the BEC......

Looking at my diagram, just pretend my module is the one your going to use. It appears to be wired the same. All it does is sample the output of the receiver for position and gets a common and power to run the LEDs

 

[99crawler]

Wow! That is some cool light displays in the videos.

I saw the diagram and yes, it seems that this will work. Appreciate very much drzoo2 and ninja turtle. Definitely appreciate the hand out on the help!!!!

And to think, I all I was going to do was build a scaler truck to use between on/off road racing to kill time. Now I may just pursue this side of the RC hobby as much as my racing side.