after uploading firmware to my px4 smart flow cam the mission planner and even QC began to read data all except the opt_m_x and opt_m_y which shows Nan reasons i don’t know
and even before the firmware upload no data no communication
and whenever i connect the smart flow cam with my flight controller no data is being recieved by the controller form the cam, please i need help I have searched, used sources I can find to help
Hello @Israel_Kolawole welcome to the community.
Does the firmware you are using have “optical flow support” compiled in?
Have you followed the procedure on Optical Flow Sensor Testing and Setup — Copter documentation ?
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yes i have, i even did both for mission planner and QC, I just got the flight controller and px4 smart flow cam recently, uploaded the hexacopter 4.5 to the board and followed the documentation, when directly connected with usb it works but when connected using I2c to the pixhawk no data
Thank you, is there a way to use both Gps and px4 flow cam for navigation, where the gps brings it close to the region then the px4 enables it to land well or corrects its position
For precision landing you need markers or beakons. Not optical flow.
Google “arducopter precision landing”
okay thank you, i will do that and tell you what ever happens especially when i have issues 
but can i use the px4 flow cam and gps to make the drone land in a radius of 100cm to the landing point
No, not that i know of.
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