Everything from hovering your quad to doing simple turns requires a lot of math specific to your drone - luckily, the FC performs all of these calculations hundreds of times a second. It takes inputs from your transmitter and outputs signals to your ESC's to get the desired response. It usually internally contains a compass, accelerometer, and g-sensor. Buy plenty of these as they're the most vulnerable part of your quad (you'll break several before your quad becomes stable). These go on your motors - the curvature of a propeller is such that it pushes air downwards as it spins, creating an equal and opposite force upwards on the drone. Motors are what provide thrust for your quad. Your ESC's do exactly what the name suggests - they essentially direct the flow of current into your motors to adjust their speed. Your ESC's will then be soldered to the PDB, with each terminal corresponding to the correct ring. The terminals of your battery will be soldered to the starting points of both rings. The PDB is a small board with 2 conductive rings on its surface. Your Power Distribution Board and Electronic Speed Controllers fall under this category think of it as the nervous system of your drone. In the end your choice of battery will be a trade-off between flight time and weight. The larger the battery, the more power it will provide, but keep in mind that it will also be heavier. This will be the power source of your quad. There are plenty of good carbon fiber/metal frames out there, but I decided to build my own frame from aluminum. It acts as a mount for electrical components and your FC, and also provides a place to maintain the quad's center of balance. This will be the body and arms of your quadcopter. These are basics you'll need to secure parts of the frame and components together It can also be used to secure parts of your drone together. Soldering Equipment - This is for electrical connections, such as soldering your ESC's onto your power distribution board (more on this later) Hot Glue Gun - This is used to cover up solder joints and exposed electrical connections to prevent shorting. Wrench - This is used to tighten the propellers onto the motors as well as tighten any and all screws used in the body.
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