Now that the ESCs have been calibrated, there are some minor tweaks that need to be done to the transmitter and FC. The FS-T6 transmitter has 6 channels and 4 of them are assigned to the control sticks. This means there are 2 more channels (called auxiliary channels) remaining that can be assigned to other flight features.
With radio calibration done, it is time to solder the two remaining wires on each ESC to their corresponding motors. Each ESC has three wires that connect to one motor. A total of four wires were soldered on in Part 4 of this tutorial, each belonging to one ESC.
To set up the flight controller, the first thing you need to do is download and install Mission Planner on your computer. Power up Mission Planner and then connect your APM flight controller (FC) to your PC via a micro USB cable.
Once you have installed the power module, all power points across the main platform should have a 12V reading. You can check this by using a multi-meter. If one or all power points do not have a 12V output when a 12V Li Po is plugged in, then either your power module or the built-in power distribution board is faulty.
The Mini APM 3.1 requires a 5VDC power supply to operate. Due to this lower voltage, it cannot draw power directly from a 12V Li Po battery (attempting to power the FC up with 12V will fry it). To provide power to the FC, you will need to install an APM power module.
Building the frame is probably the easiest part. For this tutorial, the S500 quadcopter frame was chosen because it is easy to build, widely available and affordable. However, other 500mm or 450mm frame kits can also be used should you desire something different.
In this tutorial, we will be building a basic quadcopter with a diagonal motor size of 500mm and powered by the APM Mini 3.1 flight controller. Due to its size, a drone like this is best flown outdoors and can carrry itself well in light to moderate winds.