Homemade RC Car - Controls Help

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11-04-2011, 08:57 PM

Tawhite88

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Homemade RC Car - Controls Help

Currently a few friends from school and I are working on building an RC car from scratch. We're pretty much done with the frame and all the mechanical components but we're at a loss when it comes to the electrical side. We've managed to get our hands on a 6CH radio controller (we had a receiver and a speed controller but I believe they may be broken) and a motor we salvaged from one of those Razor scooters (believe its brushless) that runs on a 24V battery supply. Basically what I'm looking for is what do we need to make this thing run, and how do we hook it up together. Most of it seems plug and play but I'd hate to hook it up wrong and break another component.

The way I understand it, it looks like we just hook our motor up to a speed controller that is hooked up to our 24V power supply, this is then connected to the receiver which also has a servo attached to it for driving our steering linkage. Would we need a specific receiver power supply in a setup like this where we have a larger voltage supply for the drive motor? I've been getting very confused when trying to figure out how all this works together (H and Y bridges etc.) as electrical is not my area. As added fun we also need to fire a pneumatic tennis ball launcher remotely. The valve we currently are using is just a standard sprinkler valve that takes about 18V to trigger. I figured we could just hook this up to the receiver as well and trigger it from a switch on the remote. Is this possible?

I'm pretty much a beginner when it comes to the controls side of robotics so any help is greatly appreciated, and being new to the forums I hope I posted this in the correct area. Thanks in advance.

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11-05-2011, 02:02 AM

BuschBarber

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RE: Homemade RC Car - Controls Help

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For typical RC Electric Cars and Aircraft, the Electronic Speed Controller (ESC) has a Battery Eliminator Circuit that splits the voltage from the motor battery between the motor and the receiver. The receiver would get 4.8v and the motor would get what it needs. You need to be sure that the motor and ESC are rated for the voltage and current you are drawing. If the servos are drawing more current than the built in BEC can handle, you can purchase an external BEC that can connects to the motor batteries and the receiver. It typically can handle higher current loads and sometimes has adjustable voltage settings. You can also just use a separate battery for receiver power and not use a BEC at all. This would add more weight, but in larger aircraft, I feel it is safer to use a separate Rx battery. You can get electronic devices that allow you to use separate batteries for the servos and a separate battery for the Rx. It all comes down to how much weight you can tolllerate and the specs on the Rx and servos.

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11-05-2011, 09:05 AM

Tawhite88

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RE: Homemade RC Car - Controls Help

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The car we're building is pretty heavy already. It's going to end up being somewhere around 40~ Lbs so adding a few more ounces isn't going to hurt us. Can you recommend an ESC that would be able to hands a 24V power source?

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11-05-2011, 04:57 PM

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RE: Homemade RC Car - Controls Help

If it's gonna be that heavy, perhaps using a 50 or 60cc chainsaw engine would prove better? It's already pretty heavy, you're either going to have a very slow run or you're going to kill the batteries in five or six minutes. Tops.

It'd also simplify the electronics, a single servo with about 100-150oz-in torque can handle both throttle and brake.

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11-05-2011, 09:48 PM

Tawhite88

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RE: Homemade RC Car - Controls Help

Unfortunately due to competition rules and budget constraints we cant go with something like that.

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11-06-2011, 05:39 AM

BuschBarber

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RE: Homemade RC Car - Controls Help

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I am using ESC's from Castle Creations that handle up to 50v and 200a. The CC ICE series of ESC's captures the last 20min of motor run time and parameters such as Power, Voltage, Amperage, Motor RPM, ESC Temp, Voltage Ripple, etc. Using the CastleLink USB Connector and Software, you can connect the ESC to your PC, Download the Logged Data, Display the Data in a graphical format, Print it out, Save it to your PC, and even email it to others.

I have a Hangar 9 Carden 89" Yak54 that weighs 20lbs. I have a Turnigy 8080 electric motor that weighs 3lbs and spins a 26x10 Evolution prop at 7000rpm. It draws 140a, at full throttle, and puts out 6500w. The aircraft accelerates in the vertical. I run it on 12S1P Turnigy LiPo batteries 5000mah. You would only need a 6S pack to get 25v, if you were using LliPos.

You can get the ESC's from Castle Creations, or other brands from Hobby King. There are other brands, such as Jetti, ElectriFly, Eflite, Hacker, etc. Turnigy batteries and ESC's are available from Hobby King.

You need to check the specs on your receiver to see how much voltage it can handle. There are power expanders from SmartFly, and others, that regulate voltage to all channels independently.

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11-06-2011, 10:24 AM

Tawhite88

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RE: Homemade RC Car - Controls Help

I'm thinking of going with a little bit less power (to save money, those castle creations ESCs are beastly but a bit expensive) but hopefully the components I have picked out will work.
So far this is what I have:
Turnigy 160A 1:8th Scale Sensorless ESC w/Fan (can handle up to 5S for about 21V)
Turnigy 5000mAh 5S 20C Lipo PackBMS-L560DMG+HS 1/4 Scale Digital Servo (This looks like it should provide enough torque)

Futaba Y Servo Lead 30cm Length (So that I can get more voltage to the valve)
Turnigy 1000mAh 4S 20C Lipo Pack (This will be the power source for the valve)

These are, I believe, the motor specs:
Power Output/Voltage: 100W/24V/12V
Non-Loaded Rotation Speed: 3400 RPM
Rated Loaded Rotatation Speed: 2700 RPM

The scooter was able to carry around a ~250lb person at about 5mph so we figured it would have no trouble with a 40~45lb car. My main concern is that the battery will discharge too quickly. Luckily the course that we will be competing on is not long and should take no more than 5 min to complete (and this wont be at top speed the whole time, there are lots of turns).
Do you think that would work?

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11-08-2011, 07:36 PM

Tawhite88

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RE: Homemade RC Car - Controls Help

I just realized that the ESC I was looking at was for a brushless motor and the scoot motor we salvaged is (or I believe it is) brushed. What would happen if we were to use a brushed motor with a brushless ESC?

Edit:
I see that the Castle Creations 1/8 Mamba Monster ESC Speed Control V3 can handle both brushed and brushless motors. Why is it that with this ESC one can simply not use the thrid wire where as I read on other sites that hooking up a brushed motor to a brushless ESC in this fashion will not work. I'm really at a loss on this. I'd hate to buy a new motor as we already have had motor mounts made for the scooter motor. I guess I can use this mamba monster even though it is a bit more expensive than we anticipated spending.

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