Re: Opamp noise [ I2C, CAN... openservo example... ]

Glenn Møller-Holst wrote:
....
Output of the controller could be ethernet with IEEE 803.3af power-over-ethernet connection. Why? No expensive wires or connectors are needed - only standard wires and connectors. Ethernet have built-in transformers to insure galvanic isolation. You (and your costumers) do not need "special" power supplies with special plugs, that in a few years might be hard to buy. Many cheap switches has built-in 802.3af support. You might also just settle with USB. This interface can supply 5V up to 0.5A, but USB normally need a hub every 5 meters with rather expensive standard wires - TP based ethernet can normally span up to 100 meters - and you can patch it through your PDS wall plugs. Both ethernet and USB use checksums.
....

Hi Jim

If you only need to transport the measurements 1-2 meters in a protected environment, then you can use I2C or Controller Area Network (CAN):

Here you have a digital servo with the possibility of intelligence and I2C communication:
http://www.openservo.com/
http://www.openservo.com/forums/index.php

Schematic:
http://www.openservo.com/moin.cgi/Schematic3
(download-link in pdf beneath figure)

Softwaren in C:
http://www.openservo.com/viewcvs/OpenServo/AVR_OpenServo_V3/?root=cvs

-

Controller Area Network (CAN):
http://www.can-cia.de/
up to 1 Mbps up to 40 meters.

regards,

Glenn
.

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