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I need to run approximately 25 feet (8m) of cabling up to a project box containing an array of ultrasonic sensors. (note, I was not in charge of the design of this project, if it had been up to be I'd have gone with an array of I2C sensors and just used a single bus, but it's beyond that point now, and I'm just responsible for helping them run the cable). The sensors are low-voltage (5V), and of negligible current consumption (perhaps 100mA total), and the cable will be stored indoors, and will be stationary once installed.

I'm having trouble finding a way to source/buy some kind of cable that will have enough conductors (for a reasonable cost, ie. sub $250). I'll need 30 conductors total. None of the common options (VGA, DVI, etc) have a high enough pin count, so I thought I'd use a DSUB37 cable, with panel mount connectors on either end, but I've had no luck finding a cable of that length.

Would any of you have ideas for solutions?

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  • \$\begingroup\$ Sourcing - like in "buying"? \$\endgroup\$ – Eugene Sh. Jul 30 '18 at 16:25
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    \$\begingroup\$ I'd try looking for old external SCSI cables / Centronic cables. Those had plenty pins (more than 30 I think)... \$\endgroup\$ – Arsenal Jul 30 '18 at 16:42
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    \$\begingroup\$ Why not just use multiple Ethernet cables, they are very cheap. monoprice.com/product?p_id=27483 \$\endgroup\$ – Jack Creasey Jul 30 '18 at 17:02
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    \$\begingroup\$ This is an honest recommendation: test with two or three sensors with just about any cable that you have lying around first whether that distance works at all. 5V and cumulative 100 mA over 30 conductors sounds like a lot of chance for interference to ruin your day. \$\endgroup\$ – Marcus Müller Jul 30 '18 at 17:06
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    \$\begingroup\$ I don't understand the question. Digi-Key or Mouser have literally hundreds of various multi-conductor cables, twisted pairs, shielded, or individual, up to 600 conductors (300 twisted pairs). What the heck? \$\endgroup\$ – Ale..chenski Jul 30 '18 at 17:18
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Have you checked Mouser or other online sources? This 30-conductor ribbon cable is ~US$11/ft (~US$35/m). If you need more protection than the cable itself, it could be run inside heat-shrink tubing, or even bicycle inner-tube.

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  • \$\begingroup\$ Hadn't considered ribbon cable, I don't know how that slipped my mind. That could work! Thank you \$\endgroup\$ – Platytude Jul 30 '18 at 17:45

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