After a month-long hiatus after the crash, I redesigned the tricopter chassis. The aluminum arms are now foldable, and the motors are closer to the center of the chassis (I have yet to trim the arms to a shorter length). There is room for the new and bigger ESCs underneath the other electronics.
Actually, I don’t really know how other than to build a tricopter as awesome as mine. Earlier last month, I flew my tricopter up to about 80 feet above the ground to test its range as well as controllability. Due to a shortage of my usual propellers, I had been flying with an oversized tail […]
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 […]
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 […]
Originally, I soldered the gyro and accelerometer breakout boards directly to the tricopter’s main board, thinking that using headers would make them wobbly and unreliable. Recently, I have found myself wishing more and more that the boards were easily separable, so I rewired the board (it turns out quality headers don’t wobble at all).