"2 things to check first.
Did you calibrate the sensors properly? Is level set while in frame?
Are you positive all the motors and props are spinning the correct direction, and you have the right props on the right motors?
"I have been looking into this for quite a while but no luck. I have seen this same question posed a million times on the net, but no one seems to have an answer that is clear. There are also many YouTube videos of successful indoor / no GPS…"
"It's a 3 month old Turnigy Graphene battery. But yes, shortly after I started having issues, I lost 1 of the 3 cells. Seems like it may have been going South, which caused the false readings and red LED. New battery coming Thursday, so I will…"
"It seems my battery optimization settings in QGC were incorrect, causing a battery low / critical warning. I saw this in the log file on the SD card. I messed around with those setting and the RED LED and beeping went away.
"Yes - I am not in front of QGC right now. But the main things were setting the battery size to 5200mAh, and the scaling offsets were set to -1.0, which I changed to just 0. I really don't know what to set them to, so just guessed.
I don't know why…"
"Hi George - I am trying to figure out how to do that now. Looks like in QGroundcontrol, under Parameters / Battery Calibration, I just need to manually enter values? Or is there some automated process to do this?
I recently came across an issue on my Pixhawk running the latest PX4 firmware (loaded on 6/23/2016) through QGroundControl. 1) Starts off on ground with solid blue (or green if outside and GPS lock).2) Takes off no problem, but after 10 seconds I…
"I also have the PX4 Optical Flow Camera, Pixhawk, and PX4 software. I can't find any resource to let me know how to get it to function. It all lights up, using the I2C cable to pixhawk, but it clearly is not functioning as intended. Therefore, I…"
"For what it's worth, I have the same issue. All is good on the ground with a 100% charged battery, but then after 10 seconds in the air, I get a RED main LED and a constant beep. SD card has some log files showing 'Battery Low' and Battery…"