I'm working on a project and need to make I/O pins that are configurable to offer around 4 Amps or more of each voltage: 5vDC, 12vDC, 24vDC, and 120vAC. The pins need to be able to source and sink each voltage, as well as control dc stepper motors with pwm (expected on 24v only).
My initial thought was simple, load switches for each positive/hot, and negative/neutral pin. But I need about 30 of these little i/o pins and the cheapest prices I could find were about $90 just for all the switches! There has to be a more intelligent design that doesn't cost as much. I've been looking at variable regulators, high power opamps (analog voltage would be nice!), triode mosfets, analog frontend devices, tons of stuff I'm getting a little overwhelmed by. I feel like I need help from someone who has a formal education. My month long headache might be a 5 minute no-brainer for someone.
As for the inputs (other than power return) I feel like I have that handled. I plan on using an fpga to configure each pin. This is intended to control tons of different motors, solenoids, keypads, sensors, and light bulbs all configured their own way. A universal board beats making hundreds of adapter boards.
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