One of the cells in my lithium polymer battery rapidly started losing capacity a few days ago. I ordered two new batteries, but I needed power in the meantime. It was trivial to open up the battery and remove the faulty cell, since the other three cells were fine. The battery is now effectively a [...]
Ever since I achieved stable flight, I have gone outside for flight testing almost every day for the past week. Check out some videos after the break.
Or, the best one-line bug fix ever. For two months, I had been thinking I was running my flight controller at 166 Hz while actually running it at a measly 31 Hz. I don’t want to go into detail about how that happened, but I have fixed the problem, and now it works. I am [...]
Some systems can be controlled with a simple P controller, where a given offset is translated directly to some actuator output. Other systems, like the flight orientation control of micro aerial vehicles (MAVs), may require a damping term on the position to prevent a divergent oscillation of the vehicle’s angular position. However, the D controller [...]
Multirotor flight control requires an update frequency on the order of hundreds of cycles per second. Most ESCs sold for RC plane use are capable of reading a PPM input at frequencies of up to 400 Hz, but they do not translate the PPM input to motor speed output at the same rate. tl;dr: Flash [...]