CUAV SKYE Airspeed User manual

SKYE Airspeed Sensor
User Manual
CUAV Tech Inc.,Ltd
Manual version 1.0
Last revision date 2022-7-1

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Disclaimer
Please read the manual carefully before using it to make sure that you can use it correctly and
safely.You need to install and use this product in strict accordance with the instructions. CUAV is not liable
for any loss due to improper use.This manual is only used as a user guide. The company reserves the right
to modify and improve the product details and instructions. The relevant data shall be subject to the data
provided by our staff. CUAV does not guarantee the accuracy and reliability of the contents of the
document.
CUAV only has the obligation to provide after-sales service within the product warranty period, and the
company does not guarantee the reliability for any purpose; The company shall not be responsible for the
direct, indirect, derivative, accidental injury and other losses or punishment caused by any reason or under
any circumstances.
Copyright©CUAV, Without permission, do not copy the contents or reprint.
NOTE
Please abide by local laws and regulations and do not fly in the no-fly zone.
It is forbidden to fly near the airport.
It is forbidden to fly in sensitive areas such as crowded places, military and administrative institutions,
traffic roads, etc.
Do not fly in strong wind.
Fast wiring
Connect the SKYE HUB to the flight controller using the CAN cable;
connect SKYE HUB to 8~34V power supply (3~8s battery) use XT30 power cable；
Connect the SKYE Smart Airspeed to the SKYE HUB using the airspeed cable;

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Pinouts

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N
umber
L
eft to Right
1
V
CC
2
C
AN_H
3
C
AN_L
4
G
ND
Install to Plane/VTOL
In order to achieve IP44 protection level, it needs to be installed according to the following requirements.
For conventional Plane/ VTOL，the following installation methods are recommended.
The SKYE is mounted on the bottom of the wing, as shown in the picture below
Note: The rotation of the propeller will cause airflow disturbance, which will make the UAV obtain wrong
airspeed data. It is forbidden to install the airspeed near the propeller.
Flight controller (ArduPilot firmware) parameter configuration
Run Mission planner>Configuration>All parameter table; set the following parameters and save and restart.
CAN_P1_DRIVER=1
CAN_P2_DRIVER=1
CAN_D1_PROTOCOL=1
CAN_D2_PROTOCOL=1
ARSPD_TYPE=8
ARSPD_USE=1

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If you use AP4.30 or later firmware, you need to set the following parameters
HYGRO_TYPE = 1（thermometer）
Note: ArduPilot AP4.20 and above firmware supports SKYE smart airspeed meter.
Use dual SKYE
You also need to set the following parameters
ARSPD2_USE=1
EK3_AFFINITY=8
HYGRO2_TYPE = 1（thermometer，for AP4.30 and above firmware）
Airspeed offset calibration
After the SKYE smart airspeed meter is started, the temperature compensation function is automatically
activated. For better performance, please wait for the device to heat up after starting it (the time is about 5

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minutes). During the heating process, the sensor will have a certain airspeed offset. When there is no wind,
the airspeed display is greater than 3m/s, please perform airspeed offset calibration before takeoff.
Method:
Place the pitot in a windless environment.
Run Mission planner > Data > Actions
Select "Preflight Calibration" in the first checkbox; click the "Do Action" button on the right
Preflight Airspeed Check
Please place the pitot tube in a windless environment to ensure that the airspeed value jumps within the
range of 0~3m/s.

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Hold the pitot tube with your hand, blow air into the pitot tube, and check that the airspeed value can
change according to the airflow speed, which means the inspection is completed.

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Airspeed Calibration
The airspeed ratio of different installation positions and methods will be different, and the airspeed
calibration needs to be performed on the first flight;
Set the flight controller parameter ARSPD_AUTOCAL to 1 to enable automatic calibration.
Start calibration For VTOL (choose one of the following two methods):
1. Take off in QStabilize or QLoiter mode and convert to FBWA (self-stabilizing A mode) to control
the drone to fly around 5 circles. After the ground station message bar prompts that the calibration
is complete, perform landing. After the calibration is completed, set ARSPD_AUTOCAL to 0.
2. If you do not fly in FBWA mode, you can fly with the airspeed meter enabled but the flight controller
does not depend on the airspeed but on the airspeed (ARSPD_USE=1; ARSPD_TYPE=8; do not fly in
a high wind environment This operation); use Loiter mode to circle about 5 circles after takeoff, the
ground station message bar prompts that after calibration is completed, perform landing, and set
ARSPD_AUTOCAL to 0 after calibration is completed
ARSPD_TYPE // Airspeed Type
ARSPD_USB // Whether to use airspeed data (0=disable; 1=use)
ARSPD_AUTOCAL // Auto-calibrate airspeed (0=disable, 1=enable auto-calibration)
ARSPD_BUS // Airspeed on that I2C BUS (SKYE no need to set)
ARSPD_FBW_MAX // Maximum flight airspeed (m/s), use the default without special requirements
ARSPD_FBW_MIN //Minimum flight airspeed (m/s), use the default without special requirements
ARSPD_OFFSET // Airspeed offset value (do not need to be modified)
ARSPD_PIN // Airspeed Pin
ARSPD_PRIMARY // Primary airspeed sensor
ARSPD_PSI_RANGE // Sensor PSI (pounds per square inch) range
ARSPD_RATIO // Airspeed RATIO
ARSPD_SKIP_CAL
ARSPD_TUBE_ORDER // Rotate static pressure and dynamic pressure

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Maintenance
In order to prevent the accumulation of dust and other foreign objects, which will cause the air inlet of the
airspeed sensor to be blocked, please disassemble the maintenance structure casing regularly to clean up
the foreign objects in the warehouse; if it is used in dusty places such as deserts and mounds, the frequency
of cleaning and cleaning should be increased. frequency.
Parts List
The following accessories list is for reference only, and the purchase of different packages will be different.
For details, please refer to the page you purchased.
Product Specification
Item Remark
C
PU
STM32F4
A
irspeed
DroneCAN
Heating method (Pitot tube)
Resistive
A
irspeed sensor
MS5525
Sensor performance
A
irspeed range
±500km/h
Accuracy
±0.69Pa
T
otal error band
±2.5%FS
T
emperature measurement
-
20℃-125℃
Humidity measurement
0
-100%
Physical properties
Pitot tube heating power
3
2W
Operating Voltage
8
-34V
Operating temperature
-
20℃±75℃
S
ize
8
2.5x30.4x28.2mm
W
eight
22g
Protection class
IP44 (correct installation)
Number Article Amount
1 SKYE smart airspeed 1
2 SKYE HUB 1
3 CAN Data Cable 1
4 XT30 Power Cable 1
5 Airspeed Cable（HUB->SKYE) 1

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More information
CUAV official website：www.cuav.net
For more usage and machine assembly guides, please visit the Documentation Center：doc.cuav.net