We purchased a USB-1616HS-4 for our system. We planned on using the digital I/O (DIO) ports to drive these solid state relays https://www.sparkfun.com/products/13015 without realizing the DIO ports cannot provide the necessary voltage. We tested it out and the ports only provide about 2.6V but the SSRs require 3V minimum. Is there a solution you recommend that will allow us to use the USB-1616HS-4 to drive SSRs? Maybe there are different SSRs you recommend? Or can we plug your SSR-RACK24 into the USB-1616-HS-4? Note that we also have the AI-EXP48 plugged into the USB-1616HS-4 for thermocouple measurements.
FYI, the SSR output is connected to a 120VAC solenoid valve that has a peak current of 70 mA. We plan on having as many as 15 solenoid valves that we need to actuate with the USB-1616HS-4.
