I am new to UAVs, I recently bought the APM 2.5, I have uploaded the Arducopter into the APM, if I try to connect via USB or the 3DR radios to mavlink, it does not connect, the error message is "No HEARTBEAT Packets Recieved", my baud rate for usb and radios i selected them correctly (115K and 56K), and i do not have the apm and radios connected to computer at the same time i.e if radios are connected to computer apm is powered via Esc. If i click on terminal it reads port is open, the board flashes LEDs 'A' and 'C' but if i type anything e.g test, pwm and hit enter nothing happens. as long as the board is powered on the LED 'A' is blinking. I tried reseting the board by pushing the reset button still no change in behavior of the board. Please HELP!!!!
I am building this UAV for my senior project.