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12. LED Displays and Signal Encoder Messages
12.1 LED Displays
If the flight control determines any malfunctions during self-test, motor start or in flight, these malfunctions are visually
indicated via the LED displays of LD1 and LD2. LD1 and LD2 are located on the flight control PCB (also see figure 8).
The following LED codes are possible:
a) Ready to Fly
After you have plugged in the flight battery and before starting the motors, the green LED lights up and the red LED is
off. Your QuadroCopter is ready to operate. If this is not the case, there is an interference. Please observe the following
operating instructions in this chapter.
b) Starting the QuadroCopter
Rev the motors. The red LED now lights up permanently and the green LED flashes. After approx. two seconds, the
green LED also lights up permanently. If this is not the case, there is an interference. Please observe the following
operating instructions in this chapter.
c) Configuration Mode
During the configuration of the remote control, the red LED indicates the programme step and the green LED indicates
the channel to be programmed through corresponding flashing with pauses.
d) Adjustment of the Neutral Position
If an adjustment to the neutral position is carried out, the green LED flashes quickly. The red LED is off.
The following LED display options are safety indicators. The causes for this must be explored and resolved.
e) Impaired Radio Link before Take-Off
You want to take off and the engines are still off. The red and the green LEDs flash slowly at the same time and
indicate a faulty radio link.
Possible causes:
Receiver crystal has fallen out of the base, receiver crystal is defective, receiver aerial has broken
off. Transmitter aerial not pulled out, second transmitter with the same transmitter channel switched on/ batteries from
transmitter empty. Check the possible causes and restart.
If there is any permanent radio interference during flight, the QuadroCopter will start an emergency landing and the
LEDs will also indicate an impaired radio link here by simultaneous flashing.
