Design, Build, Test, Iterate

Posts Tagged ‘failure’

Tricopter crash

The Autodesk Oregon FRC Regional happens over two days: today (past) and tomorrow. Last night, I was testing a new control scheme for my tricopter in preparation for the regional when I lost control of the throttle and let the tricopter drop eight feet to a tiled floor.

Tricopter not for indoor use (yet)

Last week, I tried flying the tricopter in a larger room across the hall to observe some realistic flight behavior. Unfortunately, at this stage, I’m forced to land the tricopter a second or two after takeoff because the stupid controller feels just fine flying the thing into walls and chair legs. I need to take […]

Tricopter: gyro damping and PID control (fail)

I’ve been working on stabilization code for the tricopter using direction cosine matrices but haven’t yet gotten too far because the DCM updates too slowly. I must be doing something wrong. For now, I’ve got basic damping (basically D control) using low-pass-filtered gyro outputs and some PID control that needs adjustment. Actually that’s a misnomer […]

Tricopter: Now in Five Broken Pieces

Curse my impatience. I got wired control pretty much working, so I went ahead and hooked up my XBees (wireless link) for testing. I had my hand on the chassis just in case, but I guess I didn’t apply enough pressure—it went full throttle on its own (I had barely touched the joystick) and flew […]

MacBook Battery Swelling?

Last Tuesday, I took apart my 2nd-gen BlackBook to fix my squishy right palmrest (top was not flush against bottom case) when I was surprised by the heat and size of my battery. I don’t have a picture, but it looks like the one in this MacRumors thread. The battery is thickest at the center. […]