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Can You describe the device a bit more?On what event the button has to be pressed?Can a button be replaced by a MOSFET, transistor or relay?
Hi,A solenoid with a rubber '"finger" is probably the best way to go (at least it was some 25 years ago when we made test robots for testing hand-held terminals with 20+ solenoids.If you have a serial port (they're getting scarce these days), you can go with any of the output lines, just remember that EIA/TIA-232 is resting positive (and active negative). This can be inverteed in the control program, which you'll have to build yourself, as it will be quite OS/version dependant in connecting with the physical hardware.A couple of transistors + "glue" is all the hardware it takes to interface the solenoid to the serial line.
I would not count on a usb to serial adapter working for this. The usb converters fake a serial port enough to communicate generally but the electronics behind it are different then a real port and so they do respond differently to things like wiring up external electronics.