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?