Let's Make Robots!

nmcclana's blog

Fourier Transforms

Fourier transforms convert complex signals into a series of sinusoid waves. Since it's easy to create a sine wave with a microcontroller, you can perform a Fourier transform on a complex wave and reproduce it with sine waves.  A few sine waves could be used to generate the sounds of instruments, and many lossy files like JPEG are compressed using DCT, a form of Fourier transform.

48kHz 16-bit Stereo SPDIF

This has been out for a while, I just hadn't played with it before (check out the video to see what I'm talkin' about).  The audio quality is perfect - it's an amazing effort.  Just an SD card and an LED.  I modified it (very slightly) to work with SDHC and the Propeller Platform's pins, here's the code zip_small.gif

Linux on the Propeller

I caught up with Steve (jazzed on the Parallax Forums) last weekend in person - he has been working on porting linux to the Propeller.  Sounded a bit ambitious to me, but he has been working with Heater and they already have Zylin's ZPU processing core up and running on the Propeller - uclinux can be compiled for ZPU - the only thing missing is memory.

Jazzed has been working on that, too - he showed me a prototype he's been working on that expands the Propeller Platform with  32MB of sdram -

Retro Game Development

Doug Dingus (potatohead in the Parallax forums) has written an article about retro game development using the Propeller - he interviewed me and Jim Bagley and did a great job summarizing the Prop.  We also kicked in 5 El Jugadors to give away to readers.  Classic VGM has made a special preview version of the article here;

Demoscene video

A demo of Linus Akesson's Turbulence demo on the Propeller Platform. Links;

Linus' site (with demo code) linusakesson.net/scene/turbulence/index.php

The Shoppe at Wulfden (makers of the VGA module for the Propeller Platform)
wulfden.org/TheShoppe/prop/prplatvga.shtml

Propeller Powered Paxton Pinball

I thought this was pretty cool & and it's propeller-powered.  Ben Heck (Who I heard of from ripping multiple video game systems apart and putting them in smaller cases) made his own pinball machine, with the theme of 'Bill Paxton'.  It's all powered by a Propeller - he writes about starting out with a Basic Stamp, and moving on to a Prop here.  It was pretty well covered by the media.

Looking for Feedback on PICaxe Platform Module

I've been working a PICaxe platform module.  I did a V1 a few months ago, and recently re-did it.  Here's a prototype of V2;

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I've used the same power stage as the Propeller Platform sD - it's 5v @ 1.5A and 3.3v @1.5A with an extremely low dropout of 100mV.  Standard power and programming jack, and it has power indicator lights.

I need to make a few changes, so I thought I'd get additional feedback.

Propeller Platform SD, Almost done

I've been cooking up a new Platform Module - this is the Propeller Platform SD.  First the basics;

Seen on the Parallax Forums

Saw this in the Parallax forums (Thread), it's called the PropPad mini, and it's a Propeller with a nice hi-res tft display.  Looks like tripp has a few for sale, too - they're $100 which sounds pretty fair to me.

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El Jugador on Giant Bomb

I thought this was pretty cool. I made a few extra El Jugadors and sent them out to the media. Giant Bomb (video game website) got one and put up their video demo.

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Video here

 

 

Propeller Expo 2010, Chicago

Just a note that the 2010 Propeller expo is coming up! I think Jeff is planning three, the first will be in Chicagoland (which I've learned means 'Outside Chicago') on May 15.  The other 2 will be later this year in Norwalk, OH & Rocklin, CA.  There's robotics stuff as well as more general microcontroller projects, food, presentations, etc.  Last year, the AttoPilot guy did a presentation about his awesome project (youtube video), which I thought was really interesting.

 

Propeller Platform Video Howto

I got a new camera for Christmas (Happy New Year!), and I decided to make a 'how to put together a Propeller Platform' video.  Are these types of videos useful?

I don't think a video alone is enough for a howto (the Prop Platform has a written guide, too), but I was thinking there are a few 'advanced' techniques that beginners might benefit from seeing on video.  What do you think?

PICaxe Platform Module

I've been working on a design supporting 28 & 40 pin PICaxes.  The PICaxe board would support current and upcoming modules like the LCD I/O, motor controller, Internet / IP board, DMX, MIDI, etc.  The prototypes came out great:

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