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작성자 키트 작성일2017-08-22 14:18 조회1,643회 댓글0건

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Geek Mom Projects

Techie ideas to do with (or without) kids!

 

TinyScreen Case with Buttons

3D Printed necklace case with buttons for TinyScreen

3D Printed necklace case with buttons for TinyScreen

I just updated the TinyScreen case I’d 3D printed for my new TinyScreen and TinyDuino.  The new version of the case has protruding buttons to help access the two very small buttons built into each side of the TinyScreen.  I also wrote a new Arduino sketch to demonstrate the button functionality.  The sketch displays a 3d rotating wireframe shape, and which changes when the buttons are pushed. More ≫

Obtaining orientation angles can be a challenge

Obtaining orientation angles can be a challenge. RTIMULib may make things easier.

My blog traffic shows that a lot of the visitors are looking for information on IMUs (Inertial Measurement Units) like the MPU-6050.  Understanding how to use IMUs and access the data they provide can be daunting.  However, I just came across a new Arduino library for getting IMU data that looks like it will make things simpler.  Written by a company named Richards-Tech, the library is called RTIMULib, and can be found at https://github.com/richards-tech/RTIMULib-Arduino.

What’s incredibly awesome, and more or less unique about this library is that it comes with well-documented sample programs. More ≫

TinyScreen displays the Mandelbrot set

TinyScreen displays the Mandelbrot set.

A few months ago, I signed up for a Kickstarter for TinyScreen – a minuscule 96×64 pixel screen run by a similarly diminutive TinyDuino, an Arduino clone that is smaller than a quarter.  My parts arrived yesterday, and I jumped right into playing with them.

I had ordered the video game package which came with a TinyDuino, a TinyScreen, a TinyShield Joystick, a TinyShield USB (for connecting to the computer with a micro USB cable), and a 140 mAh LiPo battery that plugs directly into the TinyDuino. More ≫

Fully built MeArm

Fully built MeArm with custom controller.

MeArm is an open-source robotic arm kit by Benjamin Gray and Jack Howard.  They publisheddesign files for their robot on Thingiverse and a set of instructions on Instructables.  You can 3D print or lasercut the parts, or you can order them as a kit which includes all servos and screws from Adafruit.  If you create the parts yourself, you’ll need to purchase four 9g servos and assorted lenghts of M3 screws to complete the assembly. More ≫

2093095301_TUHi7rYE_025-150x150.jpg

YAWP Makes Art

 

 The Inspiration:

I’ve been very slow to create posts these last few months.  I like to think it’s not due to laziness, but just that I’ve been so busy playing with other projects.  I’m pushing myself to write up the more interesting ones.  These days I’ve been obsessed with machines that draw.  The biggest of these projects has been my wall plotter, nicknamed YAWP (Yet Another Wall Plotter).

A wall plotter (also known as V-plotter or polargraph) works by moving a pen around a vertical (or slightly angled) drawing surface by means of two motors attached to string or a timing belt.  Although wall plotters are really just very slow, low resolution printers, the potentially unlimited scalability and numerous variations in the output make them compelling to watch.  Because of their simple design and because it’s fun to watch a machine drawing with a pen, they are far more engaging than a typical desktop printer. More ≫

I found a YouTube video of a clock that can draw the time with an erasable pen, then wipe it away before restarting the cycle:

There is something very human and endearing about the motion of the arms as they perform their task of drawing and erasing over and over and over again.  After locating the plans and instructions by joo at Thingiverse, I absolutely had to make one. More ≫

30. June 2014 · 44 comments · Categories: ArduinoGyroscopesProcessing · Tags: MPU6050
MPU-6050 on GY521 breakout board

MPU-6050 on GY521 breakout board.

I’ve been using the GY-521 IMU breakout board containing Invensense’s MPU-6050 IMU to compute orientation in my self-balancing scooter (the “Halfway”). I’d like to improve the scooter’s performance on hills and uneven surfaces.  I thought I’d revisit the fusion algorithm which combines gyroscope and accelerometer data to compute the scooter’s tilt angle.  The initial code for the Halfway used a complementary filter algorithm, explained in an earlier blog post.  Accelerometer data is noisy on short time scales, and gyroscope data drifts on longer timescales, so the complementary filter combines both for greater accuracy.  However, the MPU-6050 contains a digital motion processor (DMP) which can perform the data fusion on the IMU chip iteslf. More ≫

Ready to take the

Ready to test drive the “Halfway”. Bike helmet essential for safety.

This latest project is the longest and most complicated so far.  Over the last several months I’ve been working to put together a Segway-like self-balancing scooter, aka the “Halfway”.  Many people have written up and posted similar projects online.  Google “DIY self balancing scooter” to see some examples.  Other people’s work provided a lot of inspiration and help during the design and execution of the Halfway scooter.  If you’d like to see how it turned out, skip to the end of this blog post for a video of the Halfway in action.

This particular project was appealing to me because it utilized elements from my earlier blog posts, such as obtaining angle data from an IMU andintegrating a Wii nunchuck with an Arduino.  I also got to learn some new skills, including welding metal, CAD with Google Sketchup and programming with PID control loops. More ≫

07. April 2014 · 3 comments · Categories: ArduinoRobots

Pi-BotI was recently forwarded a link to the soon-to-be released Pi-Bot robot kit.  The Pi-Bot’s Kickstarter campaign is fully funded and is estimated to ship this June.  This robot kit has many similarities to other Arduino-based robots, but at $75, it is much cheaper than anything I have seen.  This fully complete kit comes with an Arduino-compatible board, light sensor, ultrasonic sensor, breadboard and comprehensive instructions.    It seems like a great follow up for kids who’ve already mastered Mindstorms robotics and are looking to move on with their skills.  If you’re looking for an introduction to programmable robotics at a reasonable price, it’s definitely worth checking out.

I recently received some e-textile components in the mail from an Italian company called Plug and Wear (www.plugandwear.com).  In the interest of full disclosure, I should state that the company had seen my past posts on e-textiles and sent some sample products free of charge.  Free or no, e-textiles are pretty cool, and I’ve been enjoying experimenting with the items they shipped.

Soft Circuit Elements

Soft circuit elements sent by Plug and Wear

I received the five different items shown at left.    I was particularly interested in the conductive tape, which comes in a range of bright colors.  I was hoping to use it in lieu of conductive thread for a colorful project, but needed to know its conductivity before determining what to do with it. More ≫

 

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