Tag Archives: build log

Using a Trinket to control a stepper motor with acceleration – Dorm automation

After almost four years living in university dorms, I am left aching to hack a place of my own. As expected, I eventually decided to automate my dorm room window blinds.

What came of it was a fanciful bit of ultra-lightweight Arduino code.
Be sure to visit the full write-up page for more details.

At the heart of this CommandStrip-stuck gadget is one original Adafruit Trinket microcontroller sporting a feeble ATTiny85. It sits next to a generic A3988 stepper motor driver.

Continue reading Using a Trinket to control a stepper motor with acceleration – Dorm automation

Tricopter Build Log part three

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It’s alive! The tricopter went under a few more revisions and prints before finally taking to the air. My old Rev One Quadcopter has been reduced to it’s (over-engineered) frame and nothing more. Its parts (motors, ESCs, batteries, Crius AIO, etc.) have moved on to become this very tricopter.

Currently (in the picture) it is set up to fly FPV sans-GoPro. There is an optional part available to replace the camera pan/tilt servo mount/hole with an alternative “use-what-you-want” vibration-dampened plate.

Keep reading for a couple closeups and highlights of the tricopter.

Continue reading Tricopter Build Log part three

Tricopter build log part two

The frame is now prototyped and measurements are almost final. Several small changes were made to the source files as result of this prototype (now on internal-revision #24). These changes included primarily wider tolerances and smaller hardware requirements. Other potential ideas are still pending (in particular; optional “taller” landing struts, ESC/wire management, and AIO mounting).

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Changes to the last update included primarily, universal motormounts. Now it’s not necessary to use a specific cross plate on a limited range of motors. I’ve adopted the standard 16/19mm hole spacing used on many motors appropriate for this size multicopter. Also, the mount’s face is now flat on both sides, so you can more easily mod them (drill holes) for a specific motor that doesn’t follow these standards. With this, you will need to use 8mm M3 socket cap screws (instead of the shorter, countersunk M3 screws often provided with your motors) to mount said motors to the mounts.

The arms fold back too!
Continue reading Tricopter build log part two

Tricopter build log part one

The frame still needs to be prototyped on my printer, though I have modeled the finished project to get an idea of the size.

progress

The distance between motor-centers is roughly 625mm when the two front 1/2″(12.7mm) wood dowels are cut to 350mm and the tail to 310mm (-40mm). This was necessary to accommodate the inline motor hinge that pivots on the axis of the tail arm. These dimensions, along with other things, are subject to change after the prototype gets printed.

I modified Thingiverse user ennui2342’s tricopter body, based off of David Windestål’s RCExplorer tricopter, to support the stronger, more common 1/2″ wood dowels. Other minor modifications to the body were made as well.  I also loosely based my landing gear/motor mounts off of jphillips’ designs. The shock absorbing bottom plates (optional setups for FPV shown above) are unique to this tricopter.

Continue reading Tricopter build log part one