The Arms
The arms for the quadcopter had built in LED's onto the bottom side. If you read about my troubles integrating a lighting system into my DJI quadcopter, you'll understand why I like the idea of integrated LED's. The LED's are machine soldered in with resistors in between each one to keep them from burning out. The LED's definitely work with 2 cell LiPo batteries, but there were some concerns that they might blow out on a 3 cell so I just stuck with a 2 cell. On the top side of the arms there are 6 solder pads for attaching the 3 motor wires and the 3 ESC wires. At the end of the arm there are two small solder mounds that, when touched against the bottom plate of the frame, complete the circuit for the LED's.
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The arms had 4 small holed drilled for mounting the motor into place. I mounted them so the wires pointed towards the inside of the arm.
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I then proceeded to solder the motor wires onto their respective solder pads. I made sure to swap the order of the wires on two of the arms so that the motors on those arms would spin opposite to the other two. I finished all the solder connections before moving onto the bottom plate.
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