Another Reason to Beware Bargain Basement Bluetooth

I was debugging a Bluetooth-related problem on a Windows 7 machine recently, and I found another great example of why sometimes you get what you pay for, even when buying something as nominally standardized and homogeneous as a Bluetooth adapter. It so happens that this machine was using one of these $5 adapters with the fake antenna: That was the first thing I noticed about these adapters. The second was that each and every one of them had the same... Read More

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

Failed Antenna Design 101

I just got some more Bluetooth dongles in from DealExtreme. This one advertises extended range and EDR support, for $5. The package looks convincing enough, nevermind the engrish: So I cracked it open, naturally. (Hey, I was planning on using it for that crazy project.) And I was shocked to find this:  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