User's Manual

!
Attention: Keep animals away from the aircraft when the vision system is activated. The ultrasonic sensor emits high
frequency sounds that are audible to some animals.
● Keep sensors clean at all times.
● The vision system is only effective when the aircraft is within the altitude range of 3 meters.
● Make sure that the light is bright enough and the surfaces is with clear textures so that the vision system can acquire
the movement information through recognizing the ground textures.
● The vision system may not function properly when the aircraft is flying over water, low light ground and surfaces
without clear patterns or textures.
● Do not use other ultrasonic device with a frequency of 40KHz when the vision system is in operation.
!
The precision of the vision system is easily affected by the light strength and features of the surface textures. It would
happen that the ultrasonic sensor could work normally to detect the altitude when it is flying over objects that is made
by sound-absorbing materials. Once the image sensor and ultrasonic sensor are both not available, your aircraft will
switch to Gesture mode automatically. Be cautious to operate the aircraft in the following situation:
1. Fly fast at an altitude below 0.5m.
2. Fly over monochrome surfaces (like pure black, pure red, pure red and pure green).
3. Fly over strong light reflective surfaces or surfaces prone to reflection.
4. Fly over water or transparent object surfaces.
5. Fly over moving object surfaces (such as crowds, swaying juggles and glass).
6. Fly over an area where light changes dramatically and rapidly.
7. Fly over surfaces extremely dark (lux<10) or extremely bright (lux>10,000).
8. Fly over material surfaces that is good at absorbing ultrasonic waves (like thick carpet).
9. Fly over surfaces without clear textures.
10. Fly over surfaces with highly repeating textures (small grid brick in the same color).
11. Fly over surfaces that are tilting over 30 degrees (could not receive the echo of the ultrasonic wave).
12. Flying speed should be controlled not to be too fast. When the aircraft is 1 meter against the ground, the flying speed
should not be over 5m/s; When the aircraft is 2 meter against the ground, the flying speed should not be over 14m/s.
MEW4-1 User Manual
Vision Positioning System function
The Vision Positioning System is typically used in indoor environment when GPS is weak or unavailable. It works best when the aircraft
altitude is less than 3 meters.
3m
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