Guide to Building an F450 Quadcopter Using KK2.1 FC and FlySky Remote

Building an F450 Quadcopter Using KK2.1 FC and FlySky Remote

Whether you’re a hobbyist looking for a reliable starter build or a seasoned pilot seeking a cost‑effective platform, the F450 frame combined with the KK2.1 flight controller and a FlySky remote offers a perfect balance of performance and simplicity. This step‑by‑step guide walks you through every phase—from selecting parts to getting airborne—so you can launch your quadcopter with confidence.

🛠️ Parts List

Component Recommended Model Qty
Frame DJI F450 (or clone) 1
Motors 2300‑2600 KV Brushless (4‑in‑1) 4
ESCs 30A 3‑to‑2 S (4 pcs) 4
Propellers 945mm (2 CW / 2 CCW) 4
Flight Controller KK2.1 5‑Axis 1
Battery 3S 2200‑2600 mAh LiPo 1
Remote & Receiver FlySky FS‑GT3B (2.4 GHz) 1 set
Misc. Power distribution board, zip ties, double‑sided tape, soldering kit –

🔌 Wiring the KK2.1 Flight Controller

Follow the diagram below to connect the ESCs, receiver, and power distribution board (PDB). The KK2.1 uses a simple 3‑wire PWM signal per channel.

KK2.1 wiring diagram
  • Motor Leads: Connect each ESC’s three‑wire lead to the corresponding motor output on the KK2.1 (M1‑M4).
  • Power: Feed the PDB’s 5 V rail into the KK2.1’s VCC and GND pins. Do NOT connect the main LiPo directly to the flight controller.
  • Receiver: Plug the FlySky receiver’s 3‑channel PWM cable into the KK2.1’s CH1‑CH3 ports (Aileron, Elevator, Throttle). If using the 4‑channel mode, add CH4 for Yaw.

📡 Setting Up the FlySky Remote

The FlySky FS‑GT3B is a 3‑channel transmitter with a built‑in 2‑AUX switch. The steps below align its channels with the KK2.1 defaults.

  1. Bind the Receiver: Turn on the transmitter, press the bind button on the receiver, then power the receiver. A steady LED indicates a successful bind.
  2. Channel Mapping: CH1 = Aileron (Roll), CH2 = Elevator (Pitch), CH3 = Throttle. If you want a dedicated Yaw channel, assign CH4 on a 4‑channel FlySky model.
  3. Trim & Endpoints: Use the transmitter’s trim knobs to center the sticks. Set endpoints at ±100 % for full stick travel.
Tip: Disable “Dual‑Rate” on the FlySky if you prefer a linear response, or keep it enabled for a quick “sport mode” toggle.

⚙️ Configuring the KK2.1 Flight Controller

The KK2.1 offers a graphical menu displayed on its 128×64 LCD. Here’s how to set the most common parameters.

  1. Power On & Access Menu: Connect a 5 V source (USB or 5 V regulator) and press the Menu button.
  2. Select PID Tuning: PID → PID Tuning → choose Standard for beginners. Advanced users can copy the table below into a text editor and paste the values via the Custom option. 
    PID Roll       P: 40  I: 30  D: 20
PID Pitch      P: 40  I: 30  D: 20
PID Yaw        P: 70  I: 45  D: 0
  3. Set Filters: Filters → Low‑Pass → enable LPF 2 on each axis to reduce motor noise.
  4. Configure Receiver Type: Receiver → Type → select PWM. Verify that all four channels show activity when moving the sticks.
  5. Save & Exit: Press Menu → Write → confirm. The KK2.1 will reboot with the new settings.

🧭 Sensor Calibration & Setup

Accurate sensor data is essential for stable flight.

Accelerometer Calibration

  1. Place the quadcopter level on a flat surface.
  2. Navigate to Calibrate → Accelerometer → Start.
  3. Leave the quadcopter untouched for 5 seconds; the screen will display OK when finished.

Gyro Calibration

  1. Turn off the motors, then go to Calibrate → Gyro.
  2. Hold the quadcopter steady for the 5‑second countdown.

After both calibrations, double‑check the “Level” indicator on the KK2.1 screen. It should read close to 0° on all axes.

🚁 First Flight & Test Procedure

Follow this safety‑first checklist before your maiden lift‑off.

  • Battery Check: Verify the LiPo voltage is above 10.5 V (3.5 V per cell).
  • Propeller Orientation: Ensure CW propellers rotate clockwise and CCW propellers rotate counter‑clockwise.
  • Range Test: Move the remote 10 m away; confirm throttle response.
  • Hover Test:
    1. Arm the quadcopter (low‑throttle stick left‑down).
    2. Gradually raise throttle to 15 % and observe lift.
    3. Keep the quadcopter within a 1‑meter radius for the first 30 seconds.

If the quadcopter wobbles, revisit the PID settings and re‑calibrate the sensors.

🔧 Common Issues & Solutions

Problem Cause Fix
Quad never arms Throttle stick not in left‑down position Confirm arming position; reset via Menu → Reset
Motor spins opposite direction ESC wiring reversed or motor wires swapped Swap any two of the three motor wires; re‑test
Stuttery hover PID values too aggressive Lower P and I gains by 10 % increments; re‑calibrate
Remote loses signal Interference or low battery on transmitter Replace transmitter batteries; keep distance from 2.4 GHz Wi‑Fi routers
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