Hi Mike,

I think what they call a MEMS in this DLL is actually a Digital Micromirror Device (DMD). It is an array of micromirrors, see image below from this document.

Each micromirror can tilt about a single axis and typically takes only two positions (plus or minus twelve degrees). As a side note, in the image above, the flat position adopted by many of the micromirrors isn’t typically achievable. Either the micromirror is tilted completely to one side or the other, and otherwise, it is considered to have a floating position (zero degree isn’t guaranteed), like when they are unpowered. Also note that the micromirrors generally tilt about the diagonal of the square surface they describe. The values A0, A1, and A2 from the us_mems dll are there to specify the available tilts for the micromirrors. For example, you could set A0 = -12, A1 = 0, and A2 = +12, which would define three possible states for your micromirrors. The Rot Angle is the angle the micromirrors tilt about, when this value is zero, they seem to tilt about X. It is common for those devices to tilt at about 45 degrees so you would set Rot Angle = 45. P Flag and Rows 1-15 is a bit more complicated and is explained here. Basically, it is how you specify which mirrors should be in which state (A0, A1, or A2).

As such, I don’t think you can use us_mems directly to solve your problem since it doesn’t apply a radius of curvature to the mirrors (to the best of my knowledge) and only has a fixed set of three different angles. I’m guessing the people that told you to use it as a starting point meant that you could reprogram it to do what you exactly want it to do. If you need help with that let the community know.

I hope this helps, and take care,

David