Introduction: Simple Robotics for Beginners!
For my very first instructable, I decided to do something that had eluded me for several months on where to start a while back;
R/C robotics and battlebots.
The components that I used are hard to find now, but the good thing about this instructable is that it applies to all sorts of speed controllers, motors, and R/C equipment.
Step 1: Materials
For this instructable you will need a few basic R/C items, which do not cost very much if you have to buy them.
1 R/C transmitter (Mine is a 5 channel, Spektrum DX5e)
1 R/C receiver (Mine is a Spektrum AR6115e, it has to be compatible with the transmitter)
1 Speed Controller***** (Mine is a Sabertooth RC-12 Dual)
2 GEARED Motors (I have no idea what mine are, I bought them from a friend)
2 Wheels for motors
1 X-Acto knife
1-2 Batteries (mine are 7.2v 1600mAh)
1 piece of foam board as big as your robot
10-20 Zip Ties
Wire (mine is stranded 18 awg copper wire)
***** The Speed Controller is what will kill you (figuratively) if you do not pick the right type. You want a dual channel 5-10 amp speed controller which will power your receiver.
Step 2: Setup
The first step is to configure your Transmitter and Receiver. The instructions for this will be in the manual for them, and it usually just involves plugging in the receiver and powering on the transmitter while holding a button.
After you have that complete, you will want to mount the wheels onto your motor. This may be easy or hard depending on the motors, but mine were fairly easy because the hubs were already attached and glued. There is a very small little screw on the side which will tighten it against the flat part of the shaft. Just do that to both motors and you are done! Also, if your motors do not have soldered wires you will want to do that.
Step 3: Motors and the Speed Controller
This step's difficulty will vary, but with a speed controller with twisty-thing mounts like mine it will take a few seconds with a screwdriver. The motor leads are labelled M1A, M1B, M2A, and M2B. Usually B is negative, so i attached the negative wires of each motor to those terminals. Twist them tight with a screwdriver to ensure they stay put.
Step 4: The Body/Base
Just for simplicity, I used foam-core board. If you are using heavier components I would highly suggest plywood or steel.
To start, you will want to make a rough measurement of where you need to cut things out for the wheels and the zip ties and mark it with something visible like an orange highliter. With foam core, an X-acto knife works wonders and will cut through like butter.
After all of your areas are cut out, voila! you have the base. Now onto actually fitting everything...
Step 5: Mounting the Motors
You will be using zip ties to mount the motors in place. If they cannot quite reach, a good strategy is to add them together! :D
First get the motor lined up in place, and hold it there until you can fit a zip tie through the holes and around. Once they are around, tighten them enough to keep the motor snug but not too much as to rip the board. If you wish, you can use the wire cutters to snip off the loose ends. Do this with both sides, and you are done mounting the motors themselves.
To mount the speed controller, just make a tape loop and stick it on the front part of the base.
Step 6: Adding the Receiver
Now you will want to actually add the receiver so it can move (soon!)
On my speed controller, since it is dual motors, it moves off of 2 channels. It is factory set to have one channel to move both motors, and one channel to reverse both motors and you will not need to change this. Use the one you want to control forward set to Elevators, and the one you want sideways Ailerons (it is better that way)
I just taped the receiver down, but that picture seems to be lost in deep space.
Step 7: THE MOST IMPORTANT (and Optional) STEP EVER
Now we add the Balsa wood foam-flaggy thing to the servo as an improvised WOMD.
I connected it to the throttle, simply because It is easier to have it stay where i want it to stay. Cut the wood to a desirable length, find a foam scrap or object that looks sharp, and glue/zip tie it.
Step 8: Adding the Power
Now we are almost done, it is time to add the power to the contraption. I am using Traxxas Power Cell batteries, which are 7.4v and 1600mAh. You will need to pick batteries that are within the safe operating range of your speed controller, with OK run time.
Due to the weird Traxxas-patented end, i needed to come up with a way to improvise. I decided it would be a *fantastic* idea to add a piece of wire with a stripped end into the connector on each side, as it would not move and it would conduct quite nicely. Add a bit of tape and it's finished.
To actually power the thing you will need to screw the negative and positive wires into the terminals on the speed controller just like the motors from earlier. Do this BEFORE plugging the batteries into the redneck connector.
Now, simply arrange the batteries in a way which will not flip the robot and tape them there. Connect them to the connector and