Ralph is a skeleton head who moves at the neck on 2 axis left right, up down.
His Jaw moves up and down for speech and his eyes light up yellow. The project
was borne out of a friends desire to do a haunted house.
This was a particularly fun project especially given the personality of the
result.
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The innards of his skull. |
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These servos control Jaw movement and left-right axis. In this view the servo on the right controls LR movement. |
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Neck Joint |
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Wires are controls for Jaw and LR servos in the skull. |
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Neck |
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THis is the neck joint from in front looking up at his Jaw. |
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Spine |
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Note the wire running from base to box |
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Ralphs Backpack |
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It contains the controller and electronics. I'm looking for a little doll size backpack to cover it. |
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UP/dn Servo |
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On the bottom of the controller box. The control wire runs up the spine between the box and spinal column. Also note the DB-9 connector. Power and data via standard RS-232 9 pin connector. |
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Servo controller board. 8 channel PWM output, serial driven. |
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Mechanics of the skull. |
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I'm proud of this. One of the things that made this much easier was the existing mounting towers under the plate. The skeleton manufacturer clearly had something in mind for inside the brain cavity. |
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Neck Joint |
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Neck pivot showing bushing and wire connector down to UP/dn servo. |
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Neck Joint |
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This clearly shows the UP/dn pivot point and the downward pulling spring. This spring is only necessary for extream "chin-up" position, otherwise the weight of the skull would be sufficient. |
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Looking Down on his cute little head. |
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