Hi all,

I'm new here--my first post.

I have a JMI EV-1n focuser on my JMI NGT-18 that I'd like to convert to something that Ekos can use as an autofocuser. The Motofocus uses a handpad with a 9v battery that connects with a simple mono-headphone type coiled cable/connector to drive what has to be a DC motor. The motor unit doesn't have any ids or other identifying marks so I can't look it up.

The handpad has an "inward" button, an "outward" button and a slider switch to select normal speed or slower speed. As a part of the design, if you hold either button in for more than 2 seconds the speed goes to "full". Also as a part of the design is an easy way to decouple the motofocus motor from the focuser so switching from motofocus to manual focus is a snap. I like that idea as I'm just starting to get into astrophotography and would like to have manual focus available.

Testing with a digital volt meter I see that , as expected, the tip of the connector changes polarity if the motor is moving in or out.

The various voltages are as follows:

Buttons pressed less than 2 seconds:
     Slider switch to left is "slow" speed:
          Left button: +3v  Right Button" -3v
     Slider switch to right "very slow" speed:
          Left button:  +2.1v Right button: -2.1v

Button down more than 2 seconds:
     Left Button:  +9v  Right Button: -9v