Measuring flow velocity by heat advection

Measuring flow velocity by heat advectionFor the course "Meten aan water" (TU Delft), we have made a device to measure the flow velocity by advection of hot water. In this article we describe how we made the device and how the arduino is used to measure flow velocity. The measurement is based on the...
By: lschuurman

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Instructables 26 Nov 11:16

Ray tracing on an Arduino

[Greg] implemented a simple ray tracer for Arduino as a fun exercise and a way to benchmark the processor. He started out with the Moller-Trumbore algorithm, a common ray-tracing algorithm that calculates the intersection of a ray with a triangular plane without doing any pre-calculation of the planes. His code supports one static light and one static camera, which is enough to render a simple scene.

[Greg] started out with a small scene composed of a few polygons, but just finished up a scene with 505 vertices, 901 faces, and reflective surfaces (shown above). He made the above render on his PC emulator, but estimates that it would take just over 4 days to render on the Arduino. [Greg]’s project supports multiple bounces of light, which differentiates his ray tracer from some we’ve covered before (and which explains why it takes so long to render).

The ray tracer is implemented entirely with double-precision floats. This translates to a ton of software float emulation instructions, since the Arduino doesn’t have a floating-point unit. While this ray tracer can’t render anything near real-time graphics due to the slowness of the microcontroller, it’s still a great proof of concept.

The title image for this post was rendered on a modern PC, taking 263 seconds to complete. The same scene, at 64×64 resolution, was rendered on the Arduino, taking 4008 seconds to complete. That render is below.

Filed under: Arduino Hacks

Making something useful for your home with Materia 101

When you become a happy owner of a Materia 101 3d printer, the first days are really important to start experimenting with the right attitude. Understanding quickly how to get what you want from it means becoming aware of the potential applications of the 3d printing technology in your environment.

Last week we published  the tutorial  on  “Getting started with Materia 101″ created by Kristoffer  and kicking off a series of step-by-step guides to explore different topics, softwares and settings for your 3d printer.

Take a look at the second tutorial focused on  fixing things at home: “Making something useful” tutorial shows you how to start from a need, to design and print a solution. It feels great to be able to fix what’s broken!

Interested in getting in touch and showing your experiments? Join Kristoffer on the Arduino forum and give us your feedback.

Next week we are going to post a tutorial on how to create 3d-printed cases for Arduino boards. Stay tuned.

Hashtag: #Materia101

Iphone bluetooth control arduino

How-To Components:- Arduino (im used nano)- HM-10 BLE module- Iphone 4S or later, and Ipad with BLE (maybe from the "air"?)- LightBlue app from App Store (Free)Wiring:Its similar as other bluetooth modules (HC-05/06) See image if not clear.Arduino RX to Bluetooth TXArduino TX to Bluetooth RXBlue...
By: planetleak

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Instructables 25 Nov 18:49

Arduino LED Matrix Clock

This clock uses five MAX7219 8x8 LED matrices to display a clock. The two left units display the hour, the right two the minutes, and the middle matrix counts off the seconds. This is accomplished by illuminating one LED per second, counting across each row. The 8th LEDs in alternate rows are skippe...
By: PM4

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Instructables 25 Nov 18:22

DIY Robot Mold Making, Casting, and Arduino Remote Control

Learn how to build your own unique robot with ComposiMold.Parts List:ComposiStone (2lbs), Hot glue, Spray adhesive, PureCast605, Elmer’s Glue, Used ComposiMold, ProtoCast85R, Water, Toy Robot, Silicone, Cardboard Box’s, Paint, Colored tissue Paper, Cups, Wires, Delight Paper Clay, Plastic bags/ tras...
By: ComposiMold

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Instructables 25 Nov 17:38

Arduino-controlled Smart Home

This Instructable was written by PubNub Evangelist Ian Jennings. Ian's story walks through his process of building an Arduino-controlled smart home model from scratch.--Back in September, our founder Stephen and I were talking about ways to make it easier to demonstrate how PubNub could power the In...
By: ToeJamson

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Instructables 25 Nov 17:15

XY MIDI Pad with Arduino and TFT

Some weeks ago, when I looked after some ideas/modules/shields to start new projects/experiments with microcontrollers I found something interesting that would fit perfectly in my older project "USB MIDI Controller with Aduino".If you are interested about it can search in my website (link on my prof...
By: Silvius

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Instructables 25 Nov 13:24

Control DC and stepper motors with L298N Dual Motor Controller Modules and Arduino

You don’t have to spend a lot of money to control motors with an Arduino or compatible board. After some hunting around we found a neat motor control module based on the L298N H-bridge IC that can allows you to control the speed and direction of two DC motors, or control one bipolar stepper motor wi...
By: tronixlabs

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Instructables 25 Nov 12:53

3 x 3 x 3 LED Cube

A few weeks ago I bought the Velleman 3D 3 x 3 x 3 LED Cube. Along the making of this project I did something wrong and I could not get the cube to work.I decided to convert this failure into a working cube. I took my Arduino out and started to write the code. Getting started Remove the four scr...
By: charlj100

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Instructables 25 Nov 12:44