Hi all,
I'm interfacing an Arduino to an AD7714 via SPI and an AD5175 via I2C. I have a custom PCB that I designed and had printed to hold all the extra electronics. The strange thing is, when I connect the microcontroller and board with solid wire like from a jumper kit, everything works wonderfully. When I sub in a ribbon cable (smaller gauge wire, stranded), nothing works. I get error codes from the AD7714 and the Ardi won't even see the AD5175. I should note that the ribbon cable is able to power everything sufficiently.
The particular ribbon cable is this: Ribbon Cable - 10 wire (15ft) - CAB-10647 - SparkFun Electronics
However, I've also had this problem with stranded ribbon cable salvaged from an old computer. So what's going on?