This is easy manually; it just requires a cross-wired DPDT ON-OFF-ON switch. With the switch center poles hooked to +12 VDC, one switch "ON" position sends the DC brush motor powered linear actuator to one end of travel, and the other switch "ON" position sends it the other way. My linear actuators have built-in limit switches that stop motion at each extreme. But I would like to automate this function, which lowers a south facing flap in my observatory to allow low southern declination objects to be imaged. I may also need one to advance soft tube closures when the OTAs are in the park position, to keep out spiders and geckos. I had assumed that finding a USB controlled DC motor reverser would be easy, but so far, I am striking out. I thought that Pegasus Astro products might support USB polarity reversal, but they don't currently. They are working on something that does, but that is a ways off. Despite my actuators having built-in limit switches, these aren't brought out, so the ability to monitor two pairs of limit switch inputs would be nice. ASCOM compatibility would be spectacular, but that could be asking a bit much.
Any suggestions? Thanks in advance.
All the best,