Dead simple: Velleman kits from Maplins
Best(ish): USB Bit Whacker
Most capable: Arduino board
Dead simple: Velleman kits from Maplins
Best(ish): USB Bit Whacker
Most capable: Arduino board
We do it at work over that sort of distance with a USB-to-Cat5 converter. Seems to work OK, but only at USB1.1 speeds. However, that's plenty fast enough for a relay ;-)
For this job though, having the switching closer to the PC and using Plain Old Volts to carry the signal to the gates seems like a better bet... something like the USB-RLY08 for £40+Vat from would do it nicely.
I'm assuming you could pick up the 24V from the gate end, so this would only need to be a switch.
Why are you assuming the USB will be extended to 150m rather than the wires to the relay? It is easy to make a relay operate over 150m of cable.
snipped-for-privacy@t13g2000yqt.googlegroups.com...
Why are you assuming that I made such an assumption?
Why can't you comprehend "USB isn't good for 150m unless you cascade loads of hubs"?
I didn't make any assumptions about anything.
MBQ
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