Optical flow sensor with guided_no_gps mode

ArduCopter
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1

How to use optical flow sensor with guided_no_gps mode to hover and control the position and altitude ?

2

Take a look at this: The copter does not takeoff in Guided mode and EKF_GPS_TYPE = 3 (optical flow)

3

Thank you for your help.
When I connect the PX4Flow with pixhawk and after flashing firmware the parameters:
opt_m_x , opt_m_y, opt_x, opt_y are shown in mission planner.
In APM Planner that parameters are not shown and there are another parameters flow_x, flow_y but the values do not change.
I tried to move the sensor manually but the values of opt_x, opt_y rarely change and between these(0 -1 1 2) but opt_m_x , opt_m_y keep changing even when the sensor is not moving.
Is that normal?
There is not drone, just pixhawk and the sensor right now.

4

We normally use Mission Planner with px4flow because we are flashing a different formware on the device (as you should have previously done) and this neew code does not output the opt_x, opt_y.

Remember that in order to get opticall flow working with ardupilot (in flight) you need a separate range finder connected directly to the flight controler and showing distance measurement in Mission Planner.

1 Like
5

Thank you very much.
I read that notice on ardupilot wiki.Do you have an recommendation for range finder senor?

6

I am presently using the Garmin Lidar Lite V3, and I just ordered the newly released 20 meter tf mini from BENEWAKE , at 40$ its a deal… if it works ok.

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7

I have MB1043 HRLV-MaxSonar-EZ4 sonar. The same that comes with PX4Flow.
Can I use it as range finder with PX4Flow?
(I mean I have another MaxSonar not just the one comes with PX4Flow)

8

Yes that should work , either analog or serial driver

1 Like
9

I have this sensor.
I am confused how to connect it with pixhawk usibg I2C or ADC port .
Could you please help me?

10

Serial Output, PWM output, Analog Output.

Product features
MaxSonar-EZ4 detects objects from 0" to 254".
2.5-5.5V operation range. Low 2mA supply current.
42kHz Ultrasonic sensor with 20Hz reading rate.
Incredibly Small Package Sonar Range Finder.
Serial Output, PWM output, Analog Output.