Propeller Bluetooth Stack Demo

After going months without a lot of time for working on my hobby projects, I finally had a few free days to work on debugging my embedded Bluetooth stack for the Propeller. I got it working well enough to demo a Serial Port Profile device, implemented using only a Propeller Demo Board and a $2 USB Bluetooth dongle. Original blog post More about the bit-banging USB host Forum thread Source code  Read More

Embedded Bluetooth for $2

This is a continuation of my experiments in bit-banging full-speed USB on the Propeller. I have the basic host controller working reasonably well now, so I started trying to do something a bit more “useful” with it by implementing a simple Bluetooth stack on top of it. Bluetooth and USB are both quite complicated, and this project is implementing only tiny fractions of each specification. But I think it’s enough to show that the... Read More

Hacking a Digital Bathroom Scale

People all around the internet have been doing cool things with the Wii peripherals lately, including the Wii Fit balance board. Things like controlling robots or playing World of Warcraft. But what if you just want one weight sensor, not four? The balance board starts to look kind of pricey, and who wants to deal with Bluetooth if you don’t have to? I’ve had a couple ideas for problems that could be solved by a cheap interface to the... Read More

DIY Sewing Machine Retrofit

The story behind this project is a bit overcomplicated. That’s all below, if you’re interested. I made a video to explain the final product: Back Story This all started when I bought a sewing machine for making fabric RFID tags a little over a year ago, and started using it to make cute plushy objects. Well, as much as I like making plushy objects, I haven’t actually made very many of them since buying the machine. So, my boyfriend... Read More

Turbulence

For anyone who hasn’t already seen it, Linus Akesson (of Craft fame) just released his first demo for the Parallax Propeller: Turbulence. You can watch the high resolution video on capped.tv, with an introduction by Linus himself. Or, if you have a Propeller board, he’s provided binaries and source code. The demo is quite impressive, and he uses some extremely clever tricks to fit it all on a microcontroller with 32kB of EEPROM and no... Read More

RFID Garage Door Opener

Today I finished a major update to my software-only RFID decoder for the Propeller microcontroller, and I finally installed my prototype in the garage. Now I can open the garage door with my RFID badge from work, while I’m on foot or on my bike I’ll post some pictures once there’s some sunlight. (Edit: Took some pictures this morning)  Read More

Simplest RFID reader?

That’s a Propeller microcontroller board with a few resistors and capacitors on it. Just add a coil of wire, and you have an RFID reader. Here’s a picture of it scanning my corporate ID badge, and displaying the badge’s 512 bits of content on a portable TV screen: If you’re into that sort of thing, I wrote a forum post with technical details and pretty oscilloscope screenshots. Update: The forum link went dead for a while... Read More

Propeller chip + SPDIF = ???

So, kind of on a random whim, I decided to build a software SPDIF encoder for the Propeller chip. It was an interesting challenge, and the results are pretty cool, but now I have no idea what do do with it. Not an uncommon problem for me, I guess… Maybe I’ll give my Propeller board an Ethernet port and build a Squeezebox-on-a-chip. Update: Ok, so maybe that’s not such a crazy idea.. (or is it?) Anyway, I just found this, and I had... Read More

Playstation controller extender

The little hardware project I started almost 2 months ago is finally done. Completely finished. Bug free! Well, almost. It is, however, in a fully assembled state with firmware that is actually pretty usable. The Unicone2 is the result of my mini-quest to extend Playstation 2 controllers over long lengths of cat5 cable. A while back I did something similar, extending Game Cube and N64 controllers over ethernet. That was the original Universal Controller... Read More