FLOW parameters¶

9 parameters in the FLOW family. ArduCopter 4.7 only — other vehicles share many of these names but not always the same ranges or meanings.

FLOW_ADDR¶

Address on the bus

This is used to select between multiple possible I2C addresses for some sensor types. For PX4Flow you can choose 0 to 7 for the 8 possible addresses on the I2C bus.

Range	`0` to `127`
User level	Advanced

FLOW_FXSCALER¶

X axis optical flow scale factor correction

This sets the parts per thousand scale factor correction applied to the flow sensor X axis optical rate. It can be used to correct for variations in effective focal length. Each positive increment of 1 increases the scale factor applied to the X axis optical flow reading by 0.1%. Negative values reduce the scale factor.

Range	`-800` to `+800`
Increment	`1`
User level	Standard

FLOW_FYSCALER¶

Y axis optical flow scale factor correction

This sets the parts per thousand scale factor correction applied to the flow sensor Y axis optical rate. It can be used to correct for variations in effective focal length. Each positive increment of 1 increases the scale factor applied to the Y axis optical flow reading by 0.1%. Negative values reduce the scale factor.

Range	`-800` to `+800`
Increment	`1`
User level	Standard

FLOW_OPTIONS¶

Optical flow options

Optical flow options. Bit 0 should be set if the sensor is stabilised (e.g. mounted on a gimbal)

User level

Standard

Bitmask¶

Value	Meaning
`0`	Roll/Pitch stabilised

FLOW_ORIENT_YAW¶

Flow sensor yaw alignment

Specifies the number of centi-degrees that the flow sensor is yawed relative to the vehicle. A sensor with its X-axis pointing to the right of the vehicle X axis has a positive yaw angle.

Units	`cdeg`
Range	`-17999` to `+18000`
Increment	`10`
User level	Standard

FLOW_POS_X¶

X position offset

X position of the optical flow sensor focal point in body frame. Positive X is forward of the origin.

Units	`m`
Range	`-5` to `5`
Increment	`0.01`
User level	Advanced

FLOW_POS_Y¶

Y position offset

Y position of the optical flow sensor focal point in body frame. Positive Y is to the right of the origin.

Units	`m`
Range	`-5` to `5`
Increment	`0.01`
User level	Advanced

FLOW_POS_Z¶

Z position offset

Z position of the optical flow sensor focal point in body frame. Positive Z is down from the origin.

Units	`m`
Range	`-5` to `5`
Increment	`0.01`
User level	Advanced

FLOW_TYPE¶

Optical flow sensor type

Optical flow sensor type

Reboot required	Yes — the change takes effect after a reboot.
User level	Standard

Values¶

Value	Meaning
`0`	None
`1`	PX4Flow
`2`	Pixart
`3`	Bebop
`4`	CXOF
`5`	MAVLink
`6`	DroneCAN
`7`	MSP
`8`	UPFLOW
`10`	SITL