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Home Brew Analog Computer System
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GK:
Some more experimentation with the isometric projection unit. Once again the angle of rotation / perspective on both axes is fixed at 45 degrees as I haven't prototyped the synthesized sin/cos pots yet to make them (angles of rotation) fully variable. My two AD5204 quad digital pots are supposed to arrive tomorrow. I'll post up full circuit details of the 3-D projection unit once I have verified the design and finished building it.

It is the operation of the projection unit that I was trying to show off in the Lorenz Attractor example, as at the time I just happened to have had a bread-boarded generator circuit for this 3-dimensional object on the bench to act as the signal source. This evening I knocked up some generator circuitry for some much simpler 3-dimensional objects (a straight spring and a conical one). With these simpler objects the nature of the 3-D projection is much more obvious.

   


GK:
I made a boobie!   :o

However I still need to implement a multiplexer to get a pair on the screen rather than just one. No time to do that now as it's 10:30pm and time for bed  :'(  Oh man this analog computer project is going to be so awesome! When I have the multiplexer implemented along with the synthesized sine/cosine "pots" in the projection matrix/transformation circuits I'd be able to project a full boobie pair in any 3-dimensional, fully rotatable viewing angle!

Woo hooo!  ;D


GK:
Done!

Now that I've had my CRT boobie fix I promise to keep the thread a little more mature from now on.  ;D

SeanB:
C cup, as they are 3 divisions each........... ;)
GK:
Interesting conversion factor. Which manual did you get that from?  ;D

I've now written the uC code for the synthesised sine/cosine pots. The 3-D projection unit requires 8 pots in total; 4 with a sine law and 4 with a cosine law. They are arranged into two quad gangs; each quad gang comprised of two sine law pots and two cosine law pots.
One quad gang controls the angle of rotation of the 3-D projection around the Y axis and the other quad gang controls the angle of rotation around the X-axis.

Instead of using a pair of rotary encoders for the manual adjustment of the Y & X angles of rotation I ended up using a pair of single gang potentiometers across a voltage reference; their position read by the internal ADC of the PIC uC.

All I have to do now is wire in the two AD5204 quad digital pots and then I'll have full manual control over the "perspective" of the 3-D projection, rather than the currenly fixed 45/45 degree one. The first thing I'll video is the Lorenz Attractor being manually rotated on its axes.

Time for bed again, right now though.

 

 
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