Help: Bluetooth

Good day everyone. I am trying to make a robot for fun. However, since I am still in college, I am poor. What I have in mind is controlling my robot through my computer. The
robot will follow basic instructions like forward, backward, right and left. I will send instructions through my computer by using a program that I will write (maybe C#). Since I don't want any wires connecting my robot and my computer, I need those two to communicate wirelessly. One of my concepts is using Bluetooth. But I don't know much about Bluetooth, and that is why I am posting this thread today. Does anyone know where I can buy some kind of Bluetooth devices that I can connect my computer to my robot? As I mention before, I am poor, so I am looking for something cheap. It will be even better if it is simple and easy to use. Or maybe i should look into something else than Bluetooth?
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If you look for something cheap, IR is the way. I used to rip the receivers out of TV's that were left for the rubbish collector. Bluetooth will be expensive, maybe a small ISM band sender and receiver will do the job as well. And an idea from the past: ultrasonic. I guess a bandwidth of a few hunderd bit/sec wil be sufficient
Wim
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Search the web for 'bluetooth uart modules'. These are not cheap! About $60 if you order single units ($20 in numbers) . They need to be programmed once via a serial port. The manufacturers usually offer programming boards for over $100, but you can easily build one yourself using a MAX232 or a few transistors to invert RS232 levels and set them to 5V.
Once programmed, you can drop those modules onto you CPU board. They deliver TTL or 3.2V lever serial signals and have usually only 8 or so pins.
The PC side is easy too. Once your BT on the PC side found the serial adapter, It will allocate a COM port for it, so you can send it serial signals just like you would to wired serial line.
Matt

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Rip apart those cheap Radio Controlled Toys for the Transceivers. The small Cars are usually 27 or 42 MHz (something like that) and it would be beneficial to send twice as much data using two different frequencies at the same time. The frequencies are usually displayed on the packaging.
OR
I`ve made single Transistor FM Transmitters (which can be detected with ordinary FM receivers) that have a range of about 0.25 Miles! Look for the "Build your own Bug", electronic hobby sites on the `Net... ----------------------------------------------------------------------- Ashley Clarke -------------------------------------------------------

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