Another bluetooth idea

[Orac]

Hi,

My cable is a USB one so would a USB printer -> bluetooth adapter dongle work, like the ones below.

http://www.gizoo.co.uk/Products/PCGamin ... apter2.htm

http://www.amazon.co.uk/Belkin-Bluetoot ... B0001Q17NW

You can get smaller ones than this but it has some specs to look at and they support vitual comm ports.

So I would imagine I could basically cut the current USB cable down to nothing, plug it into the new dongle and fit both inside the back of the robot. Then fit a standard USB bluetooth dongle to the back of my PC.

Is there anything about these USB printer dongles that wouldn't support 2 way comms?

Thanks

[Orac]

Also, there is the wireless USB hub which looks good

http://catalog.belkin.com/IWCatProductP ... _Id=356042

http://translate.google.com/translate?u ... uage_tools

and another one coming

http://www.gefen.com/kvm/product.jsp?prod_id=4105

[PaulP]

They all suffer the same problem. Bluetooth has byte gaps and latency problems. This can cause data problems on those robots that have a very strict timing protocol.

If your robot doesn't have a strict timing then it may work.

Any system that waits for a byte to arrive before txing to the receiver and re-transmitting will have this problem. All packetised systems work this way, Radio Telemetry, Bluetooth and WiFi all wait for a full byte or even a packet to be assembled.

Older radio systems that dont work on Packets used a form of Frequency shift keying (FSK) similar to how a telephone modem works. This used to transmit bit by bit and only had the delay of 1 data bit.

If any of these are available in a miniaturised package then they would be ideal for all robots because there is almost zero delay in transmission

Again though, most 2.4 Ghz RF systems implement packets. In most cases they are much more versatile.

Anything that says 802.x will do this.