Wireless data transmission

[dennis]

I would make a generator with the coils on the moving bit and the magnets on the fixed bit. The data could use a Bluetooth chip or an optical system.

[amdx]

Nice picture.

[Tim Wescott]

Web search for "slip ring". It can be made reliable. Your version of inexpensive may not expand to match most slip ring suppliers' version of inexpensive, though.

[Grumps]

Ah, slip rings. That term escaped me, thanks.

Yes, 3 rings would be enough.

[Man at B&Q]

The power is frequency modulated with 116us period for 1 and 200us for

0 so it's between about 5 and 10kbaud.

MBQ

[Andrew Gabriel]

Every spinning VCR head assembly works this way, at 20-40MHz IIRC.

[Theo Markettos]

4Mbps Fast IrDA should do the data rate, and the chips and transceivers are off-the-shelf.

Theo

[Grumps]

Thanks, that looks exactly like what I need.