Not being able to arm the motors is more often than not caused by Pre-Arm safety checks. In other words, they're conditions that haven't been met yet for you to safely fly the IRIS+. The main LED indicator on your IRIS+ will flash different colors depending on the state of the vehicle.
- Green means it's ready to fly and it has achieved GPS fix, meaning GPS dependent flight modes will be functional.
- Blue means the IRIS+ is ready to fly but it hasn't yet achieved GPS lock. Normally you won't get this light since the safety pre checks are enabled, including the GPS fix Pre-Arm check. Disabling them will allow you to arm the motors with out GPS lock or with out complying with the other Pre-Arm checks but this is not recommended for safety reasons.
- Yellow means that you have a Pre-arm safety check that is preventing you from Arming the motors.
Also, please make sure that you have communication between your receiver and transmitter.
- After making sure your transmitter is ON, you can verify if there's a connection between these two devices. Do this by connecting through your telemetry radios ( or USB cable ) your IRIS+ to the Mission Planner software on your computer.
- After you select the proper COM Port and proper Baud Rate ( 57600 for Telemetry radios or 115200 for USB connections ) click on the ''CONNECT'' Icon until the two devices are connected.
- Once this is done, go to the ''INITIAL SETUP'' Tab and under ''Mandatory Hardware'' select Radio Calibration.
- The bars should acknowledge the movement of the control sticks on your transmitter. If they don't you may need to go through the binding procedure. Click here to visit a video on how to bind the receiver and transmitter of your IRIS+